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SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

ANNUAL REPORT
PURSUANT TO SECTION 13 OR 15(D) OF THE
SECURITIES EXCHANGE ACT OF 1934

For the Fiscal Year Ended Commission File Number
December 31, 1999 1-10777

Ambac Financial Group, Inc.
(Exact name of Registrant as specified in its charter)

Delaware 13-3621676
(State of incorporation) (I.R.S. employer identification


One State Street Plaza
New York, New York 10004
(Address of principal executive offices) (Zip code)

(212) 668-0340
(Registrant's telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Name of each exchange on which registered
Common Stock, $0.01 per share and
Preferred Stock Purchase Rights New York Stock Exchange, Inc.

Securities registered pursuant to Section 12(g) of the Act:

None

Indicate by check mark whether the Registrant: (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
Registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes X No
--- ---

Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of Registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [X]

The aggregate market value of voting stock held by non-affiliates of the
Registrant as of March 14, 2000 was $3,026,518,517 (based upon the closing price
of the Registrant's shares of the New York Stock Exchange on March 14, 2000,
which was $43.938). For purposes of this information, the outstanding shares of
Common Stock which were owned by all directors and executive officers of the
Registrant were deemed to be shares of Common Stock held by affiliates.

As of March 14, 2000, 69,788,425 shares of Common Stock, par value $0.01 per
share, (net of 891,959 treasury shares) were outstanding.

Documents Incorporated By Reference

Portions of the Registrant's Annual Report to Stockholders for the year
ended December 31, 1999 are incorporated by reference into Parts II and IV
hereof. Portions of the Registrant's Proxy Statement dated March 31, 2000 in
connection with the Annual Meeting of Stockholders to be held on May 10, 2000
are incorporated by reference into Part III hereof.
TABLE OF CONTENTS

<TABLE>
<CAPTION>
Page
----
PART I
<S> <C> <C>
Item 1. Business......................................................... 1

Item 2. Properties....................................................... 25

Item 3. Legal Proceedings................................................ 25

Item 4. Submission of Matters to a
Vote of Security Holders......................................... 25

PART II
Item 5. Market for Registrant's Common
Equity and Related Stockholder Matters........................... 26

Item 6. Selected Financial Data.......................................... 26

Item 7. Management's Discussion and Analysis of Financial
Condition and Results of Operations.............................. 26

Item 7A. Quantitative and Qualitative Disclosures 26
About Market Risk................................................

Item 8. Financial Statements and Supplementary Data...................... 26

Item 9. Changes in and Disagreements With Accountants on
Accounting and Financial Disclosure.............................. 26

PART III
Item 10. Directors and Executive Officers
of the Registrant................................................ 27

Item 11. Executive Compensation........................................... 27

Item 12. Security Ownership of Certain
Beneficial Owners and Management................................. 27

Item 13. Certain Relationships and
Related Transactions............................................. 27
PART IV
Item 14. Exhibits, Financial Statement
Schedules, and Reports on Form 8-K............................... 27

SIGNATURES.................................................................... 33

FINANCIAL STATEMENT SCHEDULES................................................. S-1
</TABLE>
Part I

Item 1. Business.

GENERAL

Ambac Financial Group, Inc. (the "Company"), headquartered in New York
City, is a holding company whose subsidiaries provide financial guarantee
products and other financial services to clients in both the public and private
sectors around the world. The Company was incorporated on April 29, 1991. The
Company provides financial guarantees for municipal and structured finance
obligations through its principal operating subsidiary, Ambac Assurance
Corporation ("Ambac Assurance"). Through its financial services subsidiaries,
the Company provides investment agreements, interest rate swaps, investment
advisory and cash management services, primarily to states, municipalities and
their authorities.

Ambac Assurance is primarily engaged in guaranteeing municipal and
structured finance obligations and is the successor of the oldest municipal bond
insurance company, which wrote the first municipal bond insurance policy in
1971. Financial guarantee products written by Ambac Assurance in both the
primary and secondary markets guarantee payment when due of the principal of and
interest on the guaranteed obligation. In the case of a default on a guaranteed
obligation, payments under the financial guarantee policy may not be accelerated
by the policyholder without Ambac Assurance's consent. Ambac Assurance seeks to
minimize the risk inherent in its financial guarantee portfolio by maintaining a
diverse portfolio, which spreads its risk across a number of criteria, including
issue size, type of bond, geographic area and obligor. As of December 31, 1999,
Ambac Assurance's net financial guarantee in force (after giving effect for
reinsurance) was $374.5 billion. See "Financial Guarantee in Force" below.

Ambac Credit Products L.L.C. ("ACP"), a wholly-owned subsidiary of Ambac
Assurance, provides credit protection in the global markets in the form of
structured credit derivatives. These structured credit derivatives involve
private transactions with high quality counterparties. These contracts require
ACP to make payments upon the occurrence of certain defined credit events
relating to an underlying obligation (generally a fixed income security).
Structured credit derivatives issued by ACP are guaranteed by Ambac Assurance.
See "Business Segments -- Financial Guarantee" below and "Management's
Discussion and Analysis -- Market Risk" in the Company's 1999 Annual Report to
Shareholders.

Ambac Assurance has earned triple-A ratings, the highest ratings available
from Moody's Investors Service, Inc. ("Moody's"), Standard & Poor's Ratings
Group ("S&P"), Fitch IBCA, Inc., ("Fitch") and Japan Rating and Investment
Information, Inc. ("Japan R&I"). These ratings are an essential part of Ambac
Assurance's ability to provide credit enhancement. See "Rating Agencies" below.

The Company's investment agreement business ("IA Business"), conducted
through its subsidiary, Ambac Capital Funding, Inc. ("ACFI") provides investment
agreements primarily to states, municipalities and their authorities. Investment
agreements written by ACFI are rated triple-A by virtue of Ambac Assurance's
financial guarantee. Investment agreements are primarily used by municipal bond
issuers to invest bond proceeds until the proceeds can be used for their
intended purpose, such as financing construction. The investment agreement
provides for the guaranteed return of principal invested, and for the payment of
interest thereon at a guaranteed rate. See "Investment Agreements" below.

1
The Company provides interest rate swaps through its subsidiary Ambac
Financial Services, L.P. ("AFSLP") primarily to states, municipalities and their
authorities, and other entities in connection with their financings. The
interest rate swaps provided by AFSLP are guaranteed by Ambac Assurance and
provide a financing alternative that may reduce an issuer's overall borrowing
costs. See "Interest Rate Swaps" below.

The Company provides investment advisory, cash management and fund
administration services through its subsidiary, Cadre Financial Services, Inc.
("Cadre"), and broker/dealer services through its subsidiary, Cadre Securities,
Inc. ("Cadre Securities"), primarily to school districts, hospitals and health
organizations, and municipalities.

As a holding company, Ambac Financial Group, Inc. is largely dependent on
dividends from Ambac Assurance, its principal operating subsidiary, to pay
dividends on its capital stock, to pay principal and interest on its
indebtedness, to pay its operating expenses, and to make capital investments in
its subsidiaries. Dividends from Ambac Assurance are subject to certain
insurance regulatory restrictions. See "Insurance Regulatory Matters --
Wisconsin Dividend Restrictions" below and "Management's Discussion and Analysis
- -- Liquidity and Capital Resources" in the Company's 1999 Annual Report to
Stockholders.

Materials in this Form 10-K may contain information that includes or
is based upon forward-looking statements within the meaning of the Securities
Litigation Reform Act of 1995. Forward-looking statements give the Company's
expectations or forecasts of future events. You can identify these statements by
the fact that they do not relate strictly to historical or current facts. They
use words such as "anticipate," "estimate," "expect," "project," "intend,"
"plan," "believe," and other words and terms of similar meaning in connection
with a discussion of future operating or financial performance. In particular,
these include statements relating to future actions, prospective services or
products, future performance or results of current and anticipated services or
products, sales efforts, expenses, the outcome of contingencies such as legal
proceedings, and financial results.

Any or all of our forward-looking statements here or in other
publications may turn out to be wrong. They can be affected by inaccurate
assumptions or by known or unknown risks and uncertainties. Many such factors
will be important in determining the Company's actual future results. The
Company's actual results may vary materially, and there are no guarantees about
the performance of the Company's stock. These statements are based on current
expectations and the current economic environment. They involve a number of
risks and uncertainties that are difficult to predict. These statements are not
guarantees of future performance. Actual results could differ materially from
those expressed or implied in the forward-looking statements. Among factors that
could cause actual results to differ materially are: (1) changes in the
economic, credit or interest rate environment in the United States and abroad;
(2) the level of activity within the national and worldwide debt markets; (3)
competitive conditions and pricing levels; (4) legislative and regulatory
developments; (5) changes in tax laws; and (6) other risks and uncertainties
that have not been identified at this time. Ambac undertakes no obligation to
publicly correct or update any forward-looking statement if we later become
aware that it is not likely to be achieved. You are advised, however, to consult
any further disclosures we make on related subjects in our reports to the
Securities Exchange Commission.

2
BUSINESS SEGMENTS

The following paragraphs describe the business operations of Ambac
Financial Group, Inc. and its subsidiaries (sometimes collectively referred to
as "the Company") for the Company's two reportable segments: Financial Guarantee
and Financial Services.

Financial Guarantee

Generally, financial guarantee insurance written by Ambac Assurance
guarantees to the holder of the underlying obligation timely payment of
principal and interest by the issuer on such obligation in accordance with its
original payment schedule. Accordingly, in the case of issuer default on the
guaranteed obligation, payments under the financial guarantee policy may not be
accelerated by the policyholder without Ambac Assurance's consent.

Financial guarantee insurance is a form of credit enhancement that benefits
both the issuer and the investor. Issuers benefit because their securities are
sold with a higher credit rating than securities of the issuer sold without
credit enhancement, resulting in interest cost savings and greater
marketability. In addition, for complex financings and obligations of issuers
that are not well known by investors, credit enhanced obligations receive
greater market acceptance than obligations without credit enhancement. Investors
benefit from greater marketability and a reduction in the risk of loss
associated with issuer default.

Structured credit derivatives written by ACP provide credit protection in
respect of specific securities, loans or other credits. Should a defined credit
event occur, ACP would generally pay a claim equivalent to the difference
between the par value and market value of the underlying obligation. The
majority of ACP's contracts are partially hedged with various financial
institutions or structured with first loss protection. Such structuring
mitigates ACP's risk of loss and the price volatility of these financial
instruments.

The Company derives financial guarantee revenues from: (i) premiums earned
over the life of the obligations insured or covered under a credit derivative;
(ii) net investment income; (iii) net realized gains and losses; (iv) certain
structuring fees; and (v) mark-to-market gains/losses on credit derivatives
transactions. Financial guarantee revenues were $474.1 million, $408.4 million
and $339.2 million in 1999, 1998 and 1997, respectively. See "Management's
Discussion and Analysis of Financial Condition and Results of Operations" and
Note 17 of Notes to Consolidated Financial Statements in the Company's 1999
Annual Report to Stockholders.

Financial guarantee products are sold in three principal markets: the U.S.
Municipal Market, the U.S. Structured Finance and Asset-backed Market, and the
International Market.

U. S. Municipal Market

Until 1993, Ambac Assurance was almost exclusively focused on the municipal
market in the United States. The U.S. municipal market includes taxable and tax-
exempt bonds, notes and other evidences of indebtedness issued by states,
political subdivisions (e.g., cities, counties, towns and villages), water,
sewer, electric and other utility districts, airports, higher educational
institutions, hospitals, transportation and housing authorities and other
similar authorities and agencies. Municipal obligations are generally supported
by either the taxing authority of the issuer or the issuer's or underlying
obligor's ability to collect fees or assessments for certain projects or public
services. More recently, the municipal market has expanded to include
structured and asset-backed bond issues for tax liens, sports

3
stadiums, lease pools and other municipal assets. The following table sets forth
the volume of new issues of long-term (longer than 12 months) municipal bonds
and the volume of new issues of insured long-term municipal bonds over the past
ten years in the United States.

U.S. Long-Term Municipal Market

<TABLE>
<CAPTION>
Insured Bonds
Total Insured as Percentage
($ in Billions) Volume Volume of Total Volume
<S> <C> <C> <C>
1990................................................... $127.8 $ 33.5 26.2%
1991................................................... 172.4 51.9 30.1
1992................................................... 234.7 80.8 34.4
1993................................................... 292.2 107.8 36.9
1994................................................... 164.8 61.4 37.3
1995................................................... 160.3 68.5 42.7
1996................................................... 183.5 85.5 46.6
1997................................................... 220.7 107.5 48.7
1998................................................... 285.9 145.3 50.8
1999................................................... 219.3 104.3 47.6
</TABLE>


Source: Amounts, except for 1999, are based upon estimated data reported by The
Bond Buyer's 1999 Yearbook. The 1999 amounts are Ambac Assurance
estimates, compiled from industry sources including Securities Data-
Company, Inc. and The Bond Buyer. Amounts represent gross par amounts
issued or insured, respectively, during such year.

The foregoing table illustrates the changes in the total volume and insured
volume of new issues of municipal bonds over the past ten years. Changes in
volume of municipal bond issuance during this period are primarily attributable
to changes in refunding activity related to the then-current interest rate
environment, along with steady growth in the underlying market. Insured volume,
as a percentage of total volume, which had grown consistently from 1990 through
1998, has now declined slightly and is not expected to increase or decrease
materially from current levels.

Although there have been certain monetary defaults in bond issues of
substantial amounts, incidents of monetary default on municipal bonds have
historically been infrequent. Based upon data reported by the Association of
Financial Guaranty Insurors, the percentage of insured municipal bonds
experiencing monetary defaults in recent years is low relative to the entire
municipal market. The relatively low incidence of municipal bond defaults may be
partially the result of safeguards developed over the years since the Great
Depression of the 1930's, when a great number of municipal defaults occurred.
Such safeguards include the imposition of issuer debt limits, greater
supervision by state governments of local debt administration, and more thorough
credit reviews by investment firms, rating agencies and institutional investors.
While these safeguards address many of the causes of earlier defaults, they may
be inadequate to prevent an increased level of defaults in the future caused by
presently unforeseen economic and other factors.

U.S. Structured Finance and Asset-backed Market

Insurance of securities in the U.S. structured finance and asset-backed
market is typically issued in connection with structured financings or
securitizations in which the securities being issued are secured by or payable
from a specific pool of assets having an ascertainable cash flow or market value
and held by a special purpose issuing entity. Such obligations include, but are
not limited to, mortgage-backed securities and pools of home equity loans,
credit card receivables, trade receivables or other assets. While most
structured finance and asset-backed obligations are secured by or represent
interest in pools of assets, Ambac Assurance has also guaranteed structured
finance and asset-backed obligations secured by one or a few assets.

4
In general, structured finance and asset-backed obligations are payable
only from cash flow generated by a pool of assets and take the form of either
"pass-through" obligations, which represent interests in the related assets, or
"pay-through" obligations, which generally are debt obligations which are
collateralized by the related assets. Both types of obligations also generally
have the benefit of over-collateralization or one or more forms of credit
enhancement to mitigate credit risks associated with the related assets.

Structured finance and asset-backed obligations generally entail two forms
of risks: asset risk, which relates to the amount and quality of asset coverage;
and structural risk, which relates to the extent to which the transaction
structure protects the interests of the investors, and therefore the guarantor.

In general, the amount and quality of asset coverage required is determined
by the historical performance of the assets. The future performance of the
underlying pool of assets will generally determine whether the amount of over-
collateralization or other credit enhancement ultimately is sufficient to
protect investors, and therefore the guarantor, against adverse asset
performance. The ability of the servicer of the assets to properly service and
collect the underlying assets often is a factor in determining future asset
performance.

Structural risks addressed by asset-backed transactions include bankruptcy
and tax risks. Structured and asset-backed securities are usually designed to
protect the investors, and therefore the guarantor, from the bankruptcy or
insolvency of the entity that originated the underlying assets as well as from
the bankruptcy or insolvency of the servicer of those assets (the servicer of
the assets is typically responsible for collecting cash payments on the
underlying assets and forwarding such payments, net of servicing fees, to the
special purpose issuing entity). Related issues that often arise concern whether
the sale of the assets by the originator to the issuer of the asset-backed
obligations would be respected in the event of the bankruptcy or insolvency of
the originator and whether the servicer of the assets may be permitted or
required to delay the remittance to investors of any cash collections held by it
or received by it after the time it becomes subject to bankruptcy or insolvency
proceedings. In addition, servicer risk is often present in these transactions.
Generally, servicer risk is the risk that inefficiencies at the servicer level
contribute to a decline in the collections of borrower payments in the
transaction. Ambac Assurance addresses these risks through its credit
underwriting guidelines, standards and procedures.

The U.S. structured finance and asset-backed market in which Ambac
Assurance provides financial guarantees is broad and disparate, comprising
public issues and private placements. The increasingly varied classes of assets
securitized or guaranteed, and the recent rapid development of the market, make
estimating the size of the aggregate U.S. structured finance and asset-backed
markets difficult. Two of the most developed sectors of this market are public
asset-backed and mortgage-backed securities. According to Asset-Backed Alert,
volume in these two markets combined totaled $298.7 billion and $319.0 billion
in 1999 and 1998, respectively. Approximately 21% and 19% of those markets were
insured in 1999 and 1998, respectively.

International Market

Outside of the United States, sovereign and sub-sovereign issuers,
structured and asset-backed issuers, utilities and other issuers are
increasingly using financial guarantee products, particularly in markets
throughout Western Europe. A number of important trends in international markets
have contributed to this expansion. In the United Kingdom, Australia and
elsewhere, ongoing privatization efforts have shifted the burden of funding from
the

5
government to public and private capital markets, where investors may seek the
security of financial guarantee products. In Europe, Japan and Latin America,
there is growing interest in asset-backed securitization.

While the principles of securitization have been increasingly applied in
overseas markets, development in particular countries has varied due to the
sophistication of the local capital markets and the impact of financial
regulatory requirements, accounting standards and legal systems. It is
anticipated that securitization will continue to expand internationally, albeit
at varying rates in each country. Ambac Assurance insures both asset-backed and
structured transactions, sovereign and sub-sovereign debt issues, utilities, and
other obligations in selected international markets.

Ambac Assurance believes that the structural risk profile of the
international business it guarantees is generally the same as in the U.S.
However, an understanding of the unique risks related to the particular country
and region that could impact the credit of the issuer is necessary. These risks
include legal and political environments, capital market dynamics, exposures to
foreign exchange, and the degree of governmental support. Ambac Assurance
monitors these risks carefully and addresses them through its credit
underwriting guidelines, standards and procedures.

In 1997, Ambac Assurance capitalized a subsidiary in the United Kingdom,
Ambac Assurance UK Limited ("Ambac UK"), which is authorized to conduct certain
classes of general financial guarantee business in the United Kingdom. Ambac UK
is the Company's primary vehicle for directly issuing financial guarantee
policies in the United Kingdom and Europe. Ambac UK has entered into net worth
maintenance and reinsurance agreements with Ambac Assurance which support its
triple-A ratings.

In 1995, Ambac Assurance and MBIA Insurance Corporation ("MBIA") formed an
unincorporated joint venture, MBIA. AMBAC International (the "Joint Venture"),
to market financial guarantees outside of the United States. Since the inception
of the Joint Venture, the two companies have guaranteed a combined total par
amount of approximately $41.6 billion of international exposure under the Joint
Venture. Under the Joint Venture, financial guarantee policies are issued
separately by each of the companies. While retaining the right to act
individually, each company has the opportunity to reinsure up to 50 percent of
the international financial guarantee business written by the other company as
part of the Joint Venture. Customer preference, licensing and market
considerations determine which company insures a transaction. On March 21, 2000,
Ambac Assurance and MBIA announced the restructuring of their Joint Venture
arrangement. While Ambac Assurance and MBIA will continue having reciprocal
reinsurance arrangements for international business, the companies will market
and originate financial guarantees independently, with the exception of business
conducted in Japan. The Company believes that the restructuring of the Joint
Venture will not result in any reduction in premiums written from international
business, although no assurances can be given that such a reduction will not
occur.

Underwriting and Surveillance

Underwriting guidelines, policies and procedures have been developed by
Ambac Assurance's management with the intent that Ambac Assurance guarantee only
those obligations which, in the opinion of Ambac Assurance analysts, are of
investment grade quality.

Ambac Assurance's financial guarantee activity outside of the U.S. market
became significant in 1996. Geographically, the markets receiving Ambac
Assurance's primary international focus have been the United Kingdom, Australia,
France, Japan and certain parts

6
of Latin America. In addition, Ambac has guaranteed transactions in which the
geographic risk is spread over multiple countries. The types of international
obligations guaranteed have primarily been asset-backed securities, sovereign
and sub-sovereign obligations, special revenue and infrastructure obligations,
collateralized bond obligations and collateralized loan obligations. Management
has developed underwriting standards for international risks that are consistent
with those applied to risks in the United States. It believes that risk
associated with its international book of business is similar in risk type to
its domestic structured finance book of business.

The underwriting process involves review of structural, legal and credit
issues, including compliance with current Ambac Assurance underwriting
standards. These standards are reviewed periodically by management.

Ambac Assurance's policy is to reduce default risk, and the severity of
loss experienced upon the occurrence of a default, associated with the
obligations guaranteed by it to the extent practicable. The decision to
guarantee an issue is based upon such factors as the issuer's ability to repay
the bonds, the bond's security features and the bond's structure, rather than
upon an actuarial or statistical prediction of the likelihood that the issuer
will default on the underlying debt obligation. Ambac Assurance guarantees only
those bonds on which it expects not to incur a loss. However, losses may occur
from time to time and it is Ambac Assurance's policy to provide for loss
reserves that are adequate to cover potential losses. See "Losses and Reserves"
below. Underwriting criteria have been developed for each bond type, reflecting
the differences in, for example, economic and social factors, debt management,
project essentiality, financial management, legal and administrative factors,
revenue sources and security features.

All requests for insurance are reviewed by members of Ambac Assurance's
underwriting staff, which is divided into major underwriting groups. The
underwriting process is designed to screen issues carefully and begins with a
thorough credit analysis by the primary analyst assigned to the issue. The
credit is then reviewed within the primary analyst's underwriting group. At a
minimum, the primary analyst's recommendation to qualify or reject an issue must
be approved by a concurring analyst and an underwriting officer. The number of
additional approvals required for a particular credit depends on the aggregate
amount of Ambac Assurance's existing or potential exposure to the credit. In
some cases, the structure of the credit or whether it is the first time such
credit or structure is being reviewed are determining factors in the
approval/review process. On large credits where the aggregate exposure exceeds a
certain pre-determined amount, or new types of credit exposure, the underwriting
decision must be approved by a credit committee comprised of senior underwriting
officers and an attorney in addition to the analysts and underwriting officer
mentioned above. Ambac Assurance assigns internal ratings to individual
exposures as part of the underwriting process and at surveillance reviews. These
internal ratings, which represent Ambac Assurance's independent judgments, are
based upon underlying credit parameters similar to those used by rating
agencies.

Ambac Assurance determines premium rates on the basis of the bond type and
its perception of the risk it is assuming based on the credit strength of the
bond issue. Factors considered in pricing include term to maturity, structure of
the issue, and credit and market factors including, but not limited to, security
features, the presence or absence of a debt service reserve fund or additional
credit enhancement features and the interest rate spread between insured and
uninsured obligations with characteristics similar to those of the proposed bond
issue. Critical in assessing risk are factors such as the credit quality of the
issuer, type of issue, the repayment source, the type of security pledged, the
presence of

7
restrictive covenants, and the bond's maturity. Each bond issue is evaluated in
accordance with, and the final premium rate is a function of, the particular
factors as they relate to such issue. The premium rate for a new issue also take
into account the benefits to be obtained by the issuer, as well as the cost and
the projected return to Ambac Assurance.

Surveillance groups and other credit professionals review the financial
guarantee portfolio for concentration of risk by (i) specific bond types; (ii)
geographic location; and (iii) size of issue. The separate underwriting groups
are also responsible for portfolio surveillance. Portfolio surveillance analysts
schedule and execute regular and ad hoc reviews of credits in the book of
business. Risk-adjusted surveillance strategies have been developed for each
bond type. Review periods and scope of review vary by bond type based upon the
risk inherent in the nature of the credits. The focus of the surveillance review
is to determine credit trends and recommend appropriate classification and
review periods.

Those issues that are either in default or have developed problems that,
with the passage of time, may lead to a claim or loss are tracked closely by the
appropriate surveillance team. Internal or outside counsel reviews the documents
underlying any problem credit and an analysis is prepared outlining Ambac
Assurance's rights and potential remedies, the duties of all parties involved
and recommendations for corrective actions. This analysis, along with the
schedule of corrective actions, is reviewed in the regular remedial credit
meetings. Ambac Assurance also meets with issuers to reach agreement upon the
nature and the scope of the problem and to discuss the issuers' operating plans.

In many instances, Ambac Assurance, under the terms of the documents
governing the underlying obligation, has the ability, among other things, to
direct that audits be performed with respect to servicer and trustee contractual
responsibilities and to meet with the appropriate officials to outline Ambac
Assurance's concerns and rights. When the underlying economics so indicate,
Ambac Assurance may aid in a restructuring to improve the debt service coverage.

The rating agencies also monitor the credits underlying Ambac Assurance's
financial guarantee in force and, in most cases, advise Ambac Assurance of the
credit rating each issue would receive if it were not insured.

Surveillance of the credit quality of underlying reference entities in
ACP's credit derivatives portfolio is performed on a daily basis. Credit
spreads, which act as a measure of the market's perception of an issuer's credit
quality, are monitored to identify potential problems. In addition, published
credit ratings and current news reports are monitored regularly.

The Company has a Portfolio Risk Management Committee ("PRMC") which has
established various procedures and controls to monitor and manage credit risk.
The PRMC is comprised of senior credit professionals and senior management of
the Company. Its scope is enterprise-wide and its focus is on risk measurement,
risk/return optimization, and capital attribution in a portfolio context. This
committee works closely with the senior credit committees of each underwriting
group to assure that credit criteria are appropriate, maintained, and
systematically and consistently applied.

Financial Guarantees Written

Ambac Assurance provides financial guarantees for obligations in the U.S.
Municipal Finance market, U.S. Structured Finance and Asset-backed market and
the International

8
market. Total gross par guaranteed for the years ended December 31, 1999, 1998
and 1997 was $73.3 billion, $61.5 billion and $45.5 billion, respectively.

Financial Guarantees Written - U.S. Municipal Finance Market

Ambac Assurance guaranteed gross par of $32.5 billion, $33.9 billion and
$29.5 billion in 1999, 1998 and 1997, respectively, in the U.S. Municipal
Finance market. In the U.S. Municipal Finance market, an issuer typically pays
an up-front premium to Ambac Assurance at the time the policy is issued.
Premiums are usually quoted as a percentage of the total amount of principal and
interest that is scheduled to become due during the life of the bonds.

Proposed new municipal bond issues are submitted to Ambac Assurance by
issuers (or their investment bankers or financial advisors) to determine their
suitability for financial guarantee. Municipal bond issues are sold on either a
competitive or a negotiated basis. With respect to competitive issues, an issuer
will publish a notice of sale soliciting bids for the purchase of a proposed
issue of municipal bonds. Potential bidders on the bonds then form syndicates.
These syndicates then solicit a determination from some or all of the financial
guarantors whether an issue is suitable for financial guarantee and at what
premium rate and on what terms. The syndicate then determines whether to bid on
the issue with a financial guarantee (and if so, with which financial guarantor)
or without a financial guarantee. The issuer then generally selects the
syndicate with the lowest bid. In a negotiated offering, the issuer has already
selected an investment bank and that investment bank solicits premium quotes and
terms from the financial guarantors.

Ambac Assurance also provides guarantees on bonds outstanding in the
secondary market that are typically purchased by an institution to facilitate
the sale of municipal bonds in its portfolio or inventory. The guaranty
generally increases the sale price of bonds (typically by an amount greater than
the cost of the policy) and affords a wider secondary market and therefore
greater marketability to a given issue of previously issued bonds. As is the
case with new issues, the premium is generally payable in full at the time of
policy issuance. Ambac Assurance employs the same underwriting standards on
secondary market issues that it does on new municipal bond issues.

The new issue U.S. Municipal market includes guarantees designed to satisfy
debt service reserve fund requirements of municipal bond issuers. These policies
insure the availability of an amount not to exceed the debt service reserve fund
requirement for the issues, which in most cases is the lesser of one year's
maximum principal and interest payments or approximately 10% of the original
principal amount of a bond issue. The issuer must reimburse any amounts drawn
under the debt service reserve fund policy within a specified time period and at
a specified interest rate.

As of December 31, 1999 and 1998, net outstanding par exposure related to
municipal bond transactions was $173.0 billion and $156.9 billion, respectively.

Financial Guarantees Written - U.S. Structured Finance and Asset-Backed
Market

Ambac Assurance guaranteed gross par of $33.4 billion, $22.6 billion and
$12.8 billion in 1999, 1998 and 1997, respectively, in the U.S. Structured
Finance and Asset-backed market.

9
Within this market, Ambac Assurance is active in several segments, the
largest of which are the mortgage-backed and home equity loan and commercial
asset-backed markets.

Within the mortgage-backed and home equity loan market, Ambac Assurance
seeks to work with higher quality, well-capitalized issuers. The issuers
typically originate or purchase first lien mortgages, home equity loans or home
equity lines of credit, which are in turn sold by the issuers in the form of
asset-backed securities. In considering whether to guarantee these securities,
Ambac Assurance analyzes the quality of the underlying assets, the structure of
the securitization, the experience and financial strength of the servicer of the
underlying assets and the credit quality of the issuer. All of these factors,
along with market conditions determine the premium rate to be charged for the
guarantee.

The commercial asset-backed area includes providing levels of credit
enhancement for commercial paper asset-backed conduits ("conduits") and other
asset-backed securitizations. Conduits are used by issuers to efficiently fund
assets in the short-term commercial paper market. Typically sponsored by
financial institutions, customers sell financial assets such as trade
receivables to the conduits, which in turn issue commercial paper to fund the
purchase of the assets. When Ambac Assurance underwrites a new conduit for
insurance it evaluates, among other factors: (i) the quality of the assets to be
sold to the conduit; (ii) the process by which the sponsoring financial
institution adds assets to the conduit; (iii) the quality of the management team
of the conduit and the financial institution sponsoring the conduit; and (iv)
the structure of the conduit itself. All these factors, along with competitive
conditions, are used in determining the premium rate to be charged. In addition
to providing program level enhancement covering the entire conduit structure,
Ambac Assurance also may provide financial guarantee against the default of a
specific security sold into a conduit.

Premiums for structured finance and asset-backed policies are based on a
percentage of either principal or principal and interest insured. The timing of
the collection of structured finance and asset-backed premiums varies among
individual transactions; some being collected in a single payment at policy
inception date, and others being collected periodically (e.g., monthly,
quarterly or annually). As of December 31, 1999 and 1998, net outstanding par
exposure related to U.S. structured finance and asset-backed transactions was
$53.0 billion and $32.9 billion, respectively.

Financial Guarantees Written - International Market

Ambac Assurance guaranteed gross par of $7.4 billion, $5.0 billion and $3.1
billion in 1999, 1998 and 1997, respectively, in the International market.

Ambac Assurance's strategy in the international markets is to strengthen
its franchise in developed markets by focusing on high quality infrastructure,
structured finance, securitization, and utility finance transactions, and in
emerging markets by focusing on top tier future flow transactions (structured
transactions secured by future inflows of assets) and collateralized debt
obligations.

Premiums for international policies are based on a percentage of either
principal or principal and interest guaranteed. The timing of the collection of
international structured finance and asset-backed premiums varies among
individual transactions; some being collected in a single payment at policy
inception date, and others being collected periodically (i.e., monthly,
quarterly or annually). As of December 31, 1999 and 1998, net outstanding par
exposure related to international transactions was $14.3 billion and $8.5
billion, respectively.

10
Financial Guarantees in Force

Ambac Assurance underwrites and prices financial guarantees on the
assumption that the guarantee will remain in force until maturity of the
underlying bonds. Ambac Assurance estimates that the average life of its
guarantees on new issue par in force at December 31, 1999 was 10 1/2 years. The
10 1/2 year average life is determined by applying a weighted average
calculation, using the remaining years to maturity of each guaranteed bond, and
weighting them on the basis of the remaining par guaranteed. No assumptions are
made for prepayments or future refundings of guaranteed issues. Municipal bonds
generally have provisions that allow the issuer to prepay all or a portion of
the outstanding amount prior to maturity.

Ambac Assurance seeks to maintain a diversified financial guarantee
portfolio designed to spread its risk based on a variety of criteria, including
issue size, type of bond, geographic area and issuer.

As of December 31, 1999, the total net par amount of guaranteed bonds
outstanding was $240.3 billion.

Types of Bonds

The table below shows the distribution by bond type of Ambac Assurance's
guaranteed portfolio as of December 31, 1999.

Guaranteed Portfolio by Bond Type
as of December 31, 1999
<TABLE>
<CAPTION>
%of Total Net Par
Net Par Amount Amount
Bond Type Outstanding Outstanding
- ----------------------------------------------------------------------- -------------- ------------------
($ In Millions)
U.S. Municipal Finance:
<S> <C> <C>
Lease and tax-backed revenue...................................... $ 40,874 17%
General obligation................................................ 39,777 17
Utility revenue................................................... 28,867 12
Health care revenue............................................... 18,628 8
Transportation revenue............................................ 10,247 4
Investor-owned utilities.......................................... 9,393 4
Higher education.................................................. 9,172 4
Housing revenue................................................... 7,033 3
Student loans..................................................... 5,474 2
Other............................................................. 3,550 1
--------------- -----------------
Total U.S. Municipal Finance................................... 173,015 72
--------------- -----------------
U.S. Structured Finance:
Mortgage-backed and home equity.................................. 33,294 14
Asset-backed and conduits........................................ 16,398 7
Other............................................................ 3,270 1
--------------- -----------------

Total Structured Finance....................................... 52,962 22
--------------- -----------------
Total Domestic................................................. 225,977 94
--------------- ---------------
International:......................................................
Asset-backed and conduits....................................... 6,023 3
Structured credit derivatives................................... 2,110 1
Utilities....................................................... 1,188 1
Mortgage-backed and home equity................................. 1,172 -
Sovereign/sub-sovereign......................................... 1,097 -
Other........................................................... 2,740 1
--------------- ---------------
Total International............................................ 14,330 6
--------------- -----------------
Grand Total................................................ $240,307 100%
=============== =================
</TABLE>

11
Historically, International included all transactions conducted through the
Joint Venture. Joint Venture transactions may include components of domestic
exposure.

The table below shows the percentage, by bond type, of new business
guaranteed by Ambac Assurance during each of the last five years.


New Business Guaranteed by Bond Type (1)

<TABLE>
<CAPTION>
Bond Type 1999 1998 1997 1996 1995
- --------------------------------------- ------- ------ ------ ------ -------
U.S. Municipal Finance:
<S> <C> <C> <C> <C> <C>
General obligation.................... 9% 10% 18% 16% 23%
Utilities (2)......................... 9 12 12 15 16
Lease and tax-backed revenue.......... 9 15 17 23 16
Health care revenue................... 4 8 8 7 8
Transportation revenue................ 4 2 2 3 5
Higher education...................... 3 2 3 3 3
Student loans......................... 2 1 1 3 5
Housing revenue....................... 1 2 3 3 5
Other................................. 1 1 1 0 0
-------------------------------------------------
Total Municipal Finance............. 42 53 65 73 81
-------------------------------------------------
U.S. Structured Finance:
Mortgage-backed and home.............
Equity............................ 30 22 18 12 8
Asset-backed and conduits............ 16 15 9 4 5
Other................................ 2 2 3 3 1
-------------------------------------------------

Total Structured Finance............ 48 39 30 19 14
-------------------------------------------------
Total Domestic.................. 90 92 95 92 95
-------------------------------------------------

International:
Asset-backed and conduits............ 4 4 1 6 2
Structured credit derivatives........ 4 0 0 0 0
Mortgage-backed and home.............
Equity............................ 1 0 1 0 0
Sovereign/sub-sovereign.............. 0 0 1 0 0
Utilities............................ 0 1 1 0 0
Other................................ 1 3 1 2 3
-------------------------------------------------
Total International................. 10 8 5 8 5
-------------------------------------------------
Grand Total......................... 100% 100% 100% 100% 100%
=================================================
</TABLE>

(1) Stated as a percentage of total net par amount guaranteed during such year.
(2) Includes investor-owned utilities.


Issue Size

Ambac Assurance seeks a broad coverage of the market by guaranteeing small
and large issues alike. Ambac Assurance's financial guarantee exposure as of
December 31, 1999 reflects the historical emphasis on issues guaranteed with an
original par amount of less than $25 million in the municipal market. However,
with the entrance into the U.S. Structured Finance and International markets in
recent years, Ambac Assurance's emphasis has evolved towards larger deals. The
following table sets forth the distribution of Ambac Assurance's guaranteed
portfolio as of December 31, 1999, with respect to the original size of each
guaranteed issue:

12
Original Par Amount Per Issue
as of December 31, 1999

<TABLE>
<CAPTION>
% of Total Net Par % of Total Net
Number Amount Par Amount
Original Par Amount Number of Issues of Issues Outstanding Outstanding
- ------------------------------- ------------------ ----------------- ------------------- ------------------
($ In Millions)
<S> <C> <C> <C> <C>
Less than $10 million.......... 9,062 65% $ 23,789 10%
$10-25 million................. 2,378 17 29,022 12
$25-50 million................. 1,156 8 32,136 13
Greater than $50 million....... 1,408 10 155,360 65
------------------ ----------------- ------------------- ------------------
14,004 100% $240,307 100%
================== ================= =================== ==================
</TABLE>

Geographic Area

Ambac Assurance is licensed to write business in the U.S. and abroad. As of
December 31, 1999, the ten largest U.S. states, as measured by net par amount
outstanding, accounted for approximately 47% of Ambac Assurance's total net par
amount outstanding. The following table sets forth the geographic distribution
of Ambac Assurance's insured exposure as of December 31, 1999.

Guaranteed Portfolio by Geographic Area as of December 31, 1999


<TABLE>
<CAPTION>

Net Par % of Total Net
Amount Par Amount
Geographic Area Outstanding Outstanding
- --------------------------------------------------------------------- --------------------- ---------------------
($ In Millions)
Domestic:
<S> <C> <C>
California......................................................... $ 25,225 11%
New York........................................................... 16,576 7
Pennsylvania....................................................... 14,498 6
Florida............................................................ 13,406 6
Texas.............................................................. 9,352 4
Illinois........................................................... 8,097 3
Ohio............................................................... 6,917 3
New Jersey......................................................... 6,762 3
Massachusetts...................................................... 6,366 2
Michigan........................................................... 5,661 2
Mortgage and asset-backed.......................................... 49,693 21
Other states....................................................... 63,424 26
--------------------- ---------------------
Total Domestic.................................................. 225,977 94
--------------------- ---------------------
International:
United Kingdom..................................................... 2,416 1
Japan.............................................................. 1,485 1
France............................................................. 738 -
Australia.......................................................... 722 -
Mexico............................................................. 569 -
Internationally diversified........................................ 5,686 3
Other International................................................ 2,714 1
--------------------- ---------------------
Total International............................................. 14,330 6
--------------------- ---------------------
Grand Total..................................................... $240,307 100%
===================== =====================
</TABLE>

Mortgage and asset-backed obligations include guarantees with multiple
locations of risk within the United States. Internationally diversified includes
structured credit derivatives and other guarantees with multiple locations of
risk globally. Historically, International included all transactions conducted
through the Joint Venture. Joint Venture transactions may include components of
domestic exposure.

13
Single Risk

Ambac Assurance has adopted underwriting and exposure management policies
designed to limit the net guarantees in force for any one credit. In addition,
Ambac Assurance uses reinsurance to limit net exposure to any one credit. As of
December 31, 1999, Ambac Assurance's net par amount outstanding for its 20
largest credits, totaling $12.8 billion, was approximately 5% of Ambac
Assurance's total net par amount outstanding with no one credit representing
more than 1% of Ambac Assurance's total net par amount outstanding. Ambac
Assurance is also subject to certain regulatory limits and rating agency
guidelines on exposure to a single credit. See "Insurance Regulatory Matters"
and "Rating Agencies," below.

Underlying Ratings

The following table sets forth Ambac Assurance's financial guarantee
portfolio by underlying rating prior to being guaranteed by Ambac Assurance, as
of December 31, 1999:

Insured Portfolio by Underlying Rating (1)
as of December 31, 1999

<TABLE>
<CAPTION>

Net Par Amount % of Total Net Par
Rating Outstanding Amount Outstanding
- ---------------------------------------------------------------------- --------------------- ---------------------
($ In millions)

<S> <C> <C>
AAA................................................................... $ 3,496 1%
AA.................................................................... 29,179 12
A..................................................................... 131,571 55
BBB................................................................... 75,082 31
BIG (2)............................................................... 979 less than 1
--------------------- ---------------------
$240,307 100%
===================== =====================
</TABLE>

(1) Ratings represent Ambac Assurance internal ratings.
(2) Represents those bonds which have been categorized as "below investment
grade" by Ambac Assurance.

Losses and Reserves

Ambac Assurance's policy is to provide for loss and loss adjustment expense
reserves that are adequate to cover potential unidentified losses inherent to
the portfolio, as well as losses that may arise from guaranteed obligations
which are currently or imminently in monetary default. The active credit reserve
("ACR") represents an estimate of unidentified losses from our guaranteed
obligations. As of December 31, 1999, Ambac Assurance's ACR was $94.8 million.
When a monetary default occurs or is imminent with respect to a particular
guaranteed obligation, a case basis reserve is established in an amount that is
sufficient to cover the present value of the anticipated defaulted debt service
payments over the expected period of default and the estimated expenses
associated with settling the claims, less estimated recoveries under salvage or
subrogation rights. In estimating the losses on monetary defaults, Ambac
Assurance makes its assessment based on the full term of the guaranteed
obligation. All or part of the case basis reserve may be allocated from
available ACR. Ambac Assurance's net case basis reserves totaled $26.2 million
at December 31, 1999.

14
The most recent three-year history of Ambac Assurance's loss reserves, and
losses and loss adjustment expenses incurred and paid, is detailed in the table
below:

Reserve for Losses and Loss Adjustment Expenses

<TABLE>
<CAPTION>
Years Ended December 31,
------------------------------------------------------
1999 1998 1997
------------- ---------------- ----------------
<S> <C> <C> <C>
($ In Thousands)
Reserve for losses and loss adjustment expenses at January 1,........... $115,794 $103,345 $ 60,613
Less: reinsurance recoverable........................................... 3,638 4,219 393
------------- ---------------- ----------------

Net reserve for losses and loss adjustment expenses at January 1,....... 112,156 99,126 60,220
Losses and loss adjustment expenses incurred............................ 11,000 6,000 2,854
Losses and loss adjustment expenses paid (net of salvage received)...... (2,181) 7,030 (2,474)
Net balance for Connie Lee, at acquisition.............................. -- -- 38,526
------------- ---------------- ----------------

Net reserve for losses and loss adjustment expenses at December 31,..... 120,975 112,156 99,126
Plus: reinsurance recoverable........................................... 500 3,638 4,219
------------- ---------------- ----------------


Reserve for losses and loss adjustment expenses at December 31,......... $121,475 $115,794 $103,345
============= ================ ================
</TABLE>

Management of Ambac Assurance believes that the reserves for losses and
loss adjustment expenses are adequate to cover the ultimate net costs of claims,
but the reserves are necessarily based on estimates and there can be no
assurance that the ultimate liability will not exceed such estimates. See Note 2
of Notes to Consolidated Financial Statements in the Company's 1999 Annual
Report to Stockholders.

Competition

The financial guarantee business is highly competitive. Ambac Assurance's
principal competitors in the market for financial guarantees are three other
triple-A rated monoline insurance companies, Financial Guaranty Insurance
Company ("FGIC"), Financial Security Assurance Inc. ("FSA") and MBIA. In
addition, banks, multiline insurers and reinsurers, and lower rated financial
guarantee insurance companies represent additional participants in the broader
market. The principal competitive factors are: (i) premium rates; (ii)
conditions precedent to the issuance of a policy related to the structure and
security features of a proposed bond issue; (iii) the financial strength of the
guarantor; and (iv) the quality of service provided to issuers, investors and
other clients of the issuer. With respect to each of these competitive factors,
Ambac Assurance believes it is on equal footing with each of its principal
competitors.

Financial guarantee insurance also competes domestically and
internationally with other forms of credit enhancement, including letters of
credit and guarantees (for example, mortgage guarantees where pools of mortgages
secure debt service payments) provided by banks and other financial
institutions, some of which are governmental agencies. Letters of credit are
most often issued for periods of less than 10 years, although there is no legal
restriction on the issuance of letters of credit having longer terms. Thus,
financial institutions and banks issuing letters of credit compete directly with
Ambac Assurance to guarantee short-term notes and bonds with a maturity of less
than 10 years.

In order to enter the financial guarantee market certain requirements must
be met, most restrictive of which is that a significant minimum amount of
capital is required of a financial guarantor in order to obtain financial
strength ratings by the rating agencies. In addition, under the New York law, a
monoline financial guarantor must have at least $75 million of paid-in capital
and surplus and maintain thereafter at least $65 million of

15
policyholders' surplus. A similar law in California imposes a $100 million
minimum capital and surplus requirement, with a maintenance requirement
thereafter of $75 million.

Reinsurance

State insurance laws and regulations (as well as the rating agencies)
impose minimum capital requirements and single risk limits on financial
guarantee insurance companies, limiting the aggregate amount of insurance which
may be written and the maximum size of any single risk exposure which may be
assumed. Such companies can use reinsurance to diversify risk, increase
underwriting capacity, reduce additional capital needs, stabilize shareholder
returns and strengthen financial ratios. See "Insurance Regulatory Matters,"
below.

Ambac Assurance has facultative reinsurance agreements with certain high
quality reinsurers that allow Ambac Assurance to reduce its large risks, to
manage its portfolio of insurance by bond type and geographic distribution, and
to provide additional capacity for frequent bond issuers. Under these
agreements, portions of Ambac Assurance's interests and liabilities are ceded on
an issue-by-issue basis. A ceding commission is withheld to defray Ambac
Assurance's underwriting expenses. In addition, Ambac Assurance and MBIA have
entered into facultative reinsurance agreements whereby each company may
reinsure the other on risks guaranteed internationally.

Historically, Ambac Assurance had employed treaty insurance programs that
provided quota share and surplus share reinsurance. Under such programs, Ambac
Assurance ceded a percentage of certain insured policies along with a surplus
layer in excess of the quota share. Effective January 1, 1997, Ambac Assurance
discontinued ceding new business under the quota share and surplus share
reinsurance programs and only uses facultative reinsurance agreements to reduce
its risks and manage its insurance portfolio.

As of December 31, 1999, Ambac Assurance had retained approximately 87% of
its gross financial guarantees in force of $430.5 billion and had ceded
approximately 13% to its treaty and facultative reinsurers. See Note 11 of Notes
to Consolidated Financial Statements in the Company's 1999 Annual Report to
Stockholders.

As a primary financial guarantor, Ambac Assurance is required to honor its
obligations to its policyholders whether or not its reinsurers perform their
obligations under the various reinsurance agreements with Ambac Assurance. To
minimize its exposure to significant losses from reinsurer insolvencies, Ambac
Assurance evaluates the financial condition of its reinsurers, prepares annual
written reviews of such reinsurers and monitors for concentrations of credit
risk. Ambac Assurance's current primary reinsurers are American Re, AXA Re
Finance, Capital Reinsurance Company, Enhance Reinsurance Company, and MBIA.

Rating Agencies

Moody's, S&P, Fitch and Japan R&I periodically review the business and
financial condition of Ambac Assurance and other companies providing financial
guarantees. These rating agencies' reviews focus on the guarantor's underwriting
policies and procedures and the quality of the obligations guaranteed. The
rating agencies frequently perform assessments of the credits guaranteed by
Ambac Assurance to confirm that Ambac Assurance continues to meet the capital
allocation criteria considered necessary by the

16
particular rating agency to maintain Ambac Assurance's triple-A ratings. A
rating by Moody's, S&P, Fitch or Japan R&I, however, is not a "market rating" or
a recommendation to buy, hold or sell any security. Ambac Assurance's ability to
attract new business or to compete with other triple-A rated financial
guarantors, and its results of operations and financial condition, would be
materially adversely affected by any reduction in its ratings.

Insurance Regulatory Matters

General Law

Ambac Assurance is licensed to do business as an insurance company in all
50 states, the District of Columbia, the Commonwealth of Puerto Rico and the
territory of Guam. Ambac U.K., Ambac Assurance's wholly-owned subsidiary, is
licensed to transact insurance in the United Kingdom. Ambac Assurance is subject
to the insurance laws and regulations of the State of Wisconsin (the "Wisconsin
Insurance Laws"), its state of incorporation, and the insurance laws and
regulations of other states in which it is licensed to transact business. Ambac
U.K. is subject to the insurance laws and regulations of the United Kingdom.
These laws and regulations, as well as the level of supervisory authority that
may be exercised by the various state insurance departments, vary by
jurisdiction. They generally require financial guarantors to maintain minimum
standards of business conduct and solvency, meet certain financial tests, file
certain reports with regulatory authorities, including information concerning
their capital structure, ownership and financial condition. They generally
require prior approval of certain changes in control of domestic financial
guarantors and their direct and indirect parents and the payment of certain
dividends and distributions. In addition, these laws and regulations require
approval of certain inter-corporate transfers of assets and certain transactions
between financial guarantors and their direct and indirect parents and
affiliates. They generally require that all such transactions have terms no less
favorable than terms that would result from transactions between parties
negotiating at arm's length. Ambac Assurance is required to file quarterly and
annual statutory financial statements in each jurisdiction in which it is
licensed. It is subject to single and aggregate risk limits and other statutory
restrictions concerning the types and quality of investments and the filing and
use of policy forms and premium rates. Additionally, Ambac Assurance's accounts
and operations are subject to periodic examination by the Office of the
Commissioner of Insurance of the State of Wisconsin (the "Wisconsin
Commissioner") (the last such examination having been conducted in 1997 for the
period ended December 31, 1996) and other state insurance regulatory
authorities. See Note 8 of Notes to Consolidated Financial Statements in the
Company's 1999 Annual Report to Stockholders.

The Company believes that Ambac Assurance is in material compliance with
all applicable insurance laws and regulations.

Insurance Holding Company Laws

Under the Wisconsin insurance holding company laws, any acquisition of
control of the Company and thereby indirect control of Ambac Assurance requires
the prior approval of the Wisconsin Commissioner. "Control" is defined as the
direct or indirect power to direct or cause the direction of the management and
policies of a person. Any purchaser of 10% or more of the outstanding voting
stock of a corporation is presumed to have acquired control of that corporation
and its subsidiaries unless the Wisconsin Commissioner, upon application,
determines otherwise. For purposes of this test, the Company believes that a
holder of common stock having the right to cast 10% of the votes which may be
cast by

17
the holders of all shares of common stock of the Company would be deemed to have
control of Ambac Assurance within the meaning of the Wisconsin Insurance Laws.

Pursuant to these laws, both FMR Corp. and J.P. Morgan & Co. Incorporated
each obtained approval from the Wisconsin Insurance Commissioner to acquire
greater than 10% of the Company's outstanding stock. As of December 31, 1999
their respective percentages of ownership were approximately 11.0% and 10.4%. In
their respective requests for approval from the Wisconsin Commissioner, each
entity disclaimed any present intention to exercise control over the Company or
Ambac Assurance or to control or attempt to control the management or operations
of the Company or Ambac Assurance.

The Wisconsin insurance holding company laws also require prior approval by
the Wisconsin Commissioner of certain transactions between Ambac Assurance and
companies affiliated with Ambac Assurance.

Wisconsin Dividend Restrictions

Pursuant to the Wisconsin Insurance Laws, Ambac Assurance may declare
dividends, subject to any restriction in its articles of incorporation, provided
that, after giving effect to the distribution, it would not violate certain
statutory equity, solvency, income and asset tests. Distributions to the
shareholder (other than stock dividends) must be reported to the Wisconsin
Commissioner. Extraordinary dividends must be reported prior to payment and are
subject to disapproval by the Wisconsin Commissioner. An extraordinary dividend
is defined as a dividend or distribution, the fair market value of which,
together with all dividends from the preceding 12 months, exceeds the lesser of:
(a) 10% of policyholders' surplus as of the preceding December 31; or (b) the
greater of: (i) statutory net income for the calendar year preceding the date of
the dividend or distribution, minus realized capital gains for that calendar
year; or (ii) the aggregate of statutory net income for the three calendar years
preceding the date of the dividend or distribution, minus realized capital gains
for those calendar years and minus dividends paid or credited and distributions
made within the first two of the preceding three calendar years.

During 1999, 1998 and 1997, Ambac Assurance paid to the Company cash
dividends on its common stock totaling $52.0 million, $48.0 million and $44.0
million, respectively. See Note 8 of Notes to Consolidated Financial Statements
in the Company's 1999 Annual Report to Stockholders.

New York Financial Guarantee Insurance Law

New York's comprehensive financial guarantee insurance law governs the
conduct of business of all financial guarantors licensed to do business in New
York, including Ambac Assurance. This law requires a financial guarantor to
contribute to a contingency reserve an amount equal to 50% of premiums as they
are earned on a statutory basis on policies written prior to July 1, 1989. With
respect to policies written on and after July 1, 1989, it must make
contributions over a period of 20 years for municipal bonds and 15 years for all
other obligations. Contributions continue until the contingency reserve for such
insured obligations equals the greater of 50% of premiums written for the
relevant category of insurance or a percentage of the principal guaranteed
(varying from 0.55% to 2.50%, depending upon the type of obligation guaranteed).
This reserve must be maintained for the periods specified above, except that
withdrawals by the guarantor may be permitted under specified circumstances in
the event that actual loss experience

18
exceeds certain thresholds or if the reserve accumulated is deemed excessive in
relation to the guarantor's outstanding guaranteed obligations. Financial
guarantors are also required to maintain case basis loss and loss adjustment
expense reserves and unearned premium reserves on bases established by the
regulations.

The New York financial guarantee insurance law establishes single risk
limits applicable to all obligations issued by a single entity and backed by a
single revenue source. Under the limit applicable to municipal bonds, the
guaranteed average annual debt service for a single risk, net of reinsurance and
collateral, may not exceed 10% of the sum of the guarantor's policyholders'
surplus and contingency reserves. In addition, guaranteed principal of municipal
bonds attributable to any single risk, net of reinsurance and collateral, is
limited to 75% of the guarantor's policyholders' surplus and contingency
reserves. Additional single risk limits, which generally are more restrictive
than the municipal bond single risk limit, are also specified for several other
categories of guaranteed obligations, including structured finance obligations.

Aggregate risk limits are also established on the basis of aggregate net
liability and policyholders' surplus requirements. "Aggregate net liability" is
defined as outstanding principal and interest of guaranteed obligations, net of
reinsurance and collateral. Under these limits, policyholders' surplus and
contingency reserves must at least equal a percentage of aggregate net liability
that is equal to the sum of various percentages of aggregate net liability for
various categories of specified obligations. The percentage varies from 0.33%
for municipal bonds to 4.00% for certain non-investment grade obligations.

Financial Guarantee Insurance Regulation in Other States

The Wisconsin insurance laws and regulations governing municipal bond
guarantors are similar to those in New York. Under the Wisconsin regulations,
Ambac Assurance must establish a contingency reserve in an amount equal to 50%
of net statutory earned premium on municipal bond financial guarantee policies.
This reserve must be maintained for 20 years. However, the regulations provide
that compliance with contingency reserve provisions under statutes in other
jurisdictions that result in greater contributions than under the Wisconsin
regulations is deemed to constitute compliance with the Wisconsin regulations.
The Wisconsin regulations also include certain single and aggregate risk
limitations. The average annual debt service for any single issue of municipal
bonds may not exceed 10% of Ambac Assurance's policyholders' surplus. In
addition, Ambac Assurance's cumulative net liability, defined as one-third of
one percent of the guaranteed unpaid principal and interest covered by current
municipal bond insurance policies, may not exceed its qualified statutory
capital, which is defined as the sum of its capital and surplus and contingency
reserve.

California has financial guarantee insurance laws similar in structure to
those of New York. None of the risk limits established in California's
legislation with respect to business transacted by Ambac Assurance are more
stringent in any material respect than the corresponding provisions in the New
York financial guarantee insurance statute. California law requires a financial
guarantor to contribute to a contingency reserve an amount equal to 50% of
premiums as they are earned on a statutory basis on policies written prior to
July 1, 1989. With respect to policies written on and after July 1, 1989, it
must make contributions over a period of 20 years for municipal bonds and 15
years for all other obligations until the contingency reserve for such insured
obligations equals a percentage of principal outstanding (varying from 0.80% to
3.00%, depending upon the type of obligation guaranteed). This reserve must be
maintained for the periods specified above,

19
except that withdrawals by the financial guarantor may be permitted under
specified circumstances in the event that actual loss experience exceeds certain
thresholds or if the reserve accumulated is deemed excessive in relation to the
financial guarantor's outstanding insured obligations. Ambac Assurance's
reported contingency reserve is equal to the greater of the required reserve as
calculated under New York and California law.

In addition to the laws and regulations of New York, Wisconsin and
California, Ambac Assurance is subject to laws and regulations of other states
concerning the transaction of financial guarantees, none of which is more
stringent in any material respect than the New York financial guarantee
insurance statute.

Financial Services

The Company's Financial Services Segment provides investment agreements,
interest rate swaps, and investment advisory and fund administration services,
principally to states, municipalities and their authorities, school districts,
and hospitals and health organizations.

Financial services revenues are derived from: (i) net investment income;
(ii) net swap revenues; (iii) fund management and advisory revenues; and (iv)
net realized gains and losses. Excluding transactions with affiliates, total
revenues were $48.5 million, $32.4 million and $34.6 million in 1999, 1998 and
1997, respectively. See "Management's Discussion and Analysis" and Note 17 of
Notes to Consolidated Financial Statements in the Company's 1999 Annual Report
to Stockholders.

The principal competitive factors among providers of investment agreements
are: (i) contract interest rates; (ii) conditions precedent to the issuance of a
policy related to the structure and security features of a proposed investment
contract; (iii) the financial strength of the financial guarantee provider; and
(iv) the quality of service provided to issuers, investors and other clients of
the issuer. With respect to each of these competitive factors, the Company
believes that ACFI is on equal footing with each of its principal competitors.

The principal competitive factors among providers of interest rate swap
contracts are: (i) pricing of contracts; (ii) the financial strength of the
financial guarantee provider; (iii) the ability to structure a complete
financial package; and (iv) the quality of service provided to issuers,
investors and other clients of the issuer. With respect to each of these
competitive factors, the Company believes that AFSLP is on equal footing with
each of its principal competitors.

The principal competitive factors among providers of investment advisory
and fund administration services are: (i) pricing of services; (ii) investment
returns; (iii) the ability to provide services tailored to customers' needs; and
(iv) the quality of service provided to customers. With respect to each of these
competitive factors, the Company believes that Cadre and Cadre Securities are on
equal footing with each of their principal competitors.

Investment Agreements

The principal purpose of ACFI is providing investment agreements, including
investment repurchase agreements, primarily to states, municipalities and their
authorities. Investment agreements are used by municipal bond issuers to invest
bond proceeds until such proceeds can be used for their intended purpose, such
as financing construction. The

20
investment agreement provides for the guaranteed return of principal invested,
as well as the payment of interest thereon at a guaranteed rate and is rated
triple-A by virtue of Ambac Assurance's financial guarantee policy, which
guarantees its payment obligations.

ACFI manages its balance sheet to protect against a number of risks
inherent in its business including liquidity, market (principally interest rate)
and credit risk. See "Management's Discussion and Analysis -- Market Risk" in
the Company's 1999 Annual Report. ACFI is managed with the goal of matching the
effective duration of the invested assets, including hedges, to the effective
duration of the investment agreement liabilities. Its goal is to match the
expected cash flow of invested assets (including hedges) to funded liabilities
in order to minimize market and liquidity risk.

A source of liquidity risk is the ability of some counterparties to
withdraw moneys on dates other than those specified in the draw down schedule.
Liquidity risk is somewhat mitigated by provisions in certain of the municipal
investment agreements that limit an issuer's ability to draw on the funds and by
risk management procedures that require the regular re-evaluation and re-
projection of draw down schedules. Investments are restricted to fixed income
securities with a minimum average portfolio credit quality of Aa/AA. Based upon
management's projections, ACFI maintains funds invested in cash and cash
equivalents to meet short-term liquidity needs.

The following table sets forth the net payments due under ACFIs' settled
investment agreements in each of the next five years ending December 31, and the
period thereafter, based on expected call dates:

Investment Agreements Obligations

<TABLE>
<CAPTION>
($ In Thousands) Principal Amount (1)
- ---------------------------------------------------------------------------------------------------------------
<S> <C>
2000............................................................................... $2,457,817
2001............................................................................... 1,384,598
2002............................................................................... 483,254
2003............................................................................... 69,164
2004............................................................................... 40,466
All later years.................................................................... 973,549
----------------------------
$5,408,848
============================
</TABLE>
(1) As of December 31, 1999, the interest rates on these agreements ranged from
4.00% to 8.14%.

ACFI currently uses interest rate swap contracts in the normal course of
business for hedging purposes as part of its overall interest rate risk
management. Some of its interest rate swap agreements have been entered into
with its affiliate, AFSLP. Other derivative contracts that have been used by
ACFI, and may be used in the future, include financial instruments with off-
balance sheet risk such as interest rate futures contracts, and purchased
interest rate option contracts. These instruments involve, to varying degrees,
elements of credit and interest rate risk in excess of the amounts recognized in
the financial statements.

Interest rate swap contracts are agreements where ACFI agrees with other
parties to exchange, at specified intervals, the difference between fixed-rate
and floating-rate interest amounts or the difference between different interest
rate indices calculated by reference to an agreed upon notional amount.

Interest rate futures contracts are commitments to either purchase or sell
designated financial instruments at a future date for a specified price and are
settled in cash. Initial margin requirements are met in cash or other financial
instruments, and

21
changes in the contract values are settled daily. Futures contracts have little
credit risk since futures exchanges are the counterparties.

Interest Rate Swaps

AFSLP provides interest rate swaps primarily to states, municipalities and
their authorities, and other entities in connection with their financings. In
addition, AFSLP also provides interest rate swaps to ACFI, an affiliate. AFSLP
is subject to changes in the relationship between tax-exempt and taxable
interest rates, referred to as "basis risk." If actual or projected tax-exempt
interest rates change in relation to taxable rates, AFSLP will experience an
unrealized mark-to-market gain or loss. The interest rate swaps provided by
AFSLP are guaranteed by Ambac Assurance through policies that guarantee the
obligations of AFSLP and its counterparties.

AFSLP is a limited partnership. Ambac Assurance, the sole limited partner,
owns a limited partnership interest representing 90% of the total partnership
interests of AFSLP. Ambac Financial Services Holdings, Inc. ("AFS Holdings"), a
wholly-owned subsidiary of the Company, the sole general partner, owns a general
partnership interest representing 10% of the total partnership interest in
AFSLP.

In the ordinary course of business, AFSLP manages a variety of risks -
principally (i) credit; (ii) market; (iii) liquidity; (iv) operational; and (v)
legal. These risks are identified, measured, and monitored through a variety of
control mechanisms, which are in place at different levels throughout the
organization. See "Management's Discussion and Analysis -- Market Risk" in the
Company's Annual Report.

Investment Advisory and Cash Management

In December 1996, the Company acquired certain assets and assumed certain
liabilities of Cadre. Cadre is registered as an investment adviser with the SEC.
As a registered adviser, Cadre is subject to regulation in certain aspects of
its business, particularly with respect to investment advisory services provided
to investment companies and clients. Cadre provides investment advisory and
administrative services to money market funds that are primarily offered to
qualified participants, including school districts, healthcare service providers
and municipalities.

In June 1997, the Company acquired certain assets and assumed certain
liabilities of Cadre Securities. Cadre Securities principal business is the
distribution of money market funds to the education, healthcare and municipal
sectors, as well as the brokering of short-term fixed income securities trades
on behalf of its clients. It also serves as placement agent and dealer for
securities issued by its affiliates in private placement transactions. Cadre
Securities is registered as a broker-dealer with the SEC and with certain states
that require such registration, and it is a member of the National Association
of Securities Dealers, Inc. As a registered broker-dealer, Cadre Securities is
subject to the net capital requirements of Rule 15c3-1 of the Securities
Exchange Act of 1934, as amended, which is designed to measure the general
financial condition and liquidity of a broker-dealer. In accordance with this
rule, the ratio of aggregate indebtedness to net capital ("net capital ratio")
shall not exceed 15 to 1. At December 31, 1999, Cadre Securities had net capital
of $202,668, which was $102,668 in excess of its required net capital of
$100,000. The net capital ratio was 3.7 to 1.

22
At December 31, 1999, Cadre and Cadre Securities provided services to
approximately 3,000 clients with approximately $6.9 billion in assets.

Fees from the money market funds for which Cadre and Cadre Securities
perform services are based on percentages of the average daily net assets of
such funds. Cadre Securities receives fees for brokering short-term fixed income
securities trades by marking up the price of the securities purchased and sold
on behalf of clients. These fees are recorded upon execution of the trades
since, at that time, substantially all of Cadre Securities' obligations have
been fulfilled.

Investments and Investment Policy

As of December 31, 1999, the consolidated investments of the Company had an
aggregate fair value of approximately $9.0 billion and an aggregate amortized
cost of approximately $9.3 billion. These investments are managed internally by
officers of the Company, who are experienced investment managers. In the normal
course of business, the Company uses derivative contracts for hedging purposes
as part of its overall interest rate risk management. These derivative contracts
may include interest rate futures contracts, interest rate swap agreements and
purchased interest rate option contracts. All investments, including derivative
contracts, are effected in accordance with the general objectives and guidelines
for investments established by each subsidiary's Board of Directors. These
guidelines encompass credit quality, risk concentration and holding period, and
are periodically reviewed and revised as appropriate.

Pursuant to Statement of Financial Accounting Standards No. 115,
"Accounting for Certain Investments in Debt and Equity Securities," the Company
has designated all investments as "available-for-sale" and reports them at fair
value. Unrealized gains and losses are excluded from earnings and reported as a
component of "Accumulated Other Comprehensive (Loss) Income", in stockholders'
equity, net of tax.

As of December 31, 1999, Ambac Assurance's investment portfolio had an
aggregate fair value of approximately $3.7 billion and an aggregate amortized
cost of approximately $3.9 billion. Ambac Assurance's investment policy is
designed to achieve diversification of its portfolio and only permits investment
in investment grade fixed income securities, consistent with its goal to achieve
the highest after-tax, long-term return. This policy takes into consideration
Ambac Assurance's desire for both current income and long-term capital growth.
Ambac Assurance is subject to limits on types and quality of investments imposed
by the insurance laws and regulations of the States of Wisconsin and New York.
In compliance with these laws, Ambac Assurance's Board of Directors approves
each specific investment transaction of Ambac Assurance. See "Insurance
Regulatory Matters - General Law," above.

As of December 31, 1999, ACFI's investment portfolio had an aggregate fair
value of approximately $5.2 billion and an aggregate amortized cost of $5.4
billion. ACFI's investment policy is designed to achieve the highest after-tax
return on equity, subject to minimum average quality ratings. For further
discussion, see "Investment Agreements," above.

23
The following tables provide certain information concerning the investments
of the Company:

Investments by Rating (1)
as of December 31, 1999
<TABLE>
<CAPTION>
% of Investment
Rating Portfolio
- ------------------------------------------------------------------------------------------- ----------------------
<S> <C>
AAA (2).................................................................................... 77%
AA......................................................................................... 12
A.......................................................................................... 9
BBB........................................................................................ -
Not Rated.................................................................................. 2
----------------------
100%
======================
</TABLE>

(1) Ratings represent S&P classifications. If unavailable, Moody's rating is
used.
(2) Includes U.S. Treasury and agency obligations, which comprised
approximately 27% of the total investment portfolio.

Summary of Investments
As of December 31,

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------
1999 1998 1997
-------------------------------- ------------------------------ --------------------------
Weighted Weighted Weighted
Carrying Average Carrying Average Carrying Average
Investment Category Value Yield (1) (2) Value Yield (1) (2) Value Yield (1) (2)
- --------------------------------------------------- -------------- ------------ -------------- --------- -------------
<S> <C> <C> <C> <C> <C> <C>
($ In Thousands)
Long-term investments:
Taxable bonds....................... $6,001,199 6.28% $6,082,903 6.61% $4,545,177 6.75%
Tax-exempt bonds.................... 2,737,272 5.78 2,539,379 6.13 2,228,667 6.20
------------- ------------- ----------------
Total long-term investments....... 8,738,471 6.13 8,622,282 6.47 6,773,844 6.55
Short-term investments (3): 220,896 5.56 119,528 5.69 136,278 5.43
------------- ------------- ----------------
Total investments................. $8,959,367 6.11% $8,741,810 6.45% $6,910,122 6.52%
============= ============= ================
</TABLE>

(1) Yields presented include assets held in the IA Business portfolio. Interest
expense on related investment agreements was $299.5 million, $263.6 million
and $186.7 million in 1999, 1998 and 1997, respectively.
(2) Yields are stated on a pre-tax basis, based on average amortized cost.
(3) Includes taxable and tax-exempt investments.

<TABLE>
<CAPTION>


Investments by Security Type
As of December 31,
------------------------------------------------------------------------------------------------
1999 1998 1997
------------------------------------ ------------------------- ------------------------------

Weighted Weighted Weighted
Carrying Average Carrying Average Carrying Average
Investment Category Value Yield (1) (2) Value Yield (1)(2) Value Yield (1) (2)
- ----------------------------------------------------------- ------------- ---------- ------------- ------------ -------------
<S> <C> <C> <C> <C> <C> <C>
($ In Thousands)
Municipal obligations (4)................ $2,962,939 5.80% $2,801,324 6.19% $2,298,996 6.20%
Corporate securities..................... 1,008,504 7.10 1,435,427 7.33 1,093,587 7.61
U.S. government obligations.............. 62,479 6.10 122,896 5.80 139,598 6.25
Mortgage- and asset-backed securities
(includes U.S. Government Agency
obligations) (3)........................ 4,704,549 6.08 4,262,635 6.36 3,222,756 6.46
Other.................................... -- -- -- -- 18,907 3.72
---------- ----------- --------------
Total long-term investments............. 8,738,471 6.13 8,622,282 6.47 6,773,844 6.55
Short-term investments (4)............... 220,896 5.56 119,528 5.69 136,278 5.43
---------- ----------- --------------
Total investments....................... $8,959,367 6.11% $8,741,810 6.45% $6,910,122 6.52%
========== =========== ==============
</TABLE>

(1) Yields presented include assets held in the IA Business portfolio. Interest
expense on related investment agreements was $299.5 million, $263.6 million
and $186.7 million in 1999, 1998 and 1997, respectively.
(2) Yields are stated on a pre-tax basis, based on average amortized cost.
(3) The actual maturity dates of mortgage- and asset-backed securities are
uncertain because the underlying mortgages may be paid prior to the stated
maturity of such securities. This possibility of prepayment creates the risk
that the Company will be unable to replace such investments with securities
of comparable yield.
(4) Includes taxable and tax-exempt investments.

24
Distribution of Investments by Maturity
as of December 31, 1999

<TABLE>
<CAPTION>
Amortized Estimated
Maturity Cost Fair Value
- ------------------------------------------------------------------------ ------------------------- -------------------------
($ In Thousands)
<S> <C> <C>
Due in one year or less (1)............................................. $ 296,784 $ 296,646
Due after one year through five years................................... 284,950 292,852
Due after five years through ten years.................................. 402,370 402,065
Due after ten years..................................................... 3,488,560 3,263,255
------------------------- -------------------------
4,472,664 4,254,818
Mortgage- and asset-backed securities (2)............................... 4,776,416 4,704,549
------------------------- -------------------------
Total investments....................................................... $9,249,080 $8,959,367
========================= =========================
</TABLE>

(1) Includes securities with a fair value of $75.7 million, which are classified
as long-term investments in the tables above but which mature within one
year.
(2) The actual maturity dates of mortgage- and asset-backed securities are
uncertain because the underlying mortgages may be paid prior to the stated
maturity of such securities. This possibility of prepayment creates the risk
that the Company will be unable to replace such investments with securities
of comparable yield.

For further discussion, see Note 3 of Notes to Consolidated Financial
Statements in the Company's 1999 Annual Report to Stockholders.

Employees

As of December 31, 1999, the Company and its subsidiaries had 331
employees. None of the employees is covered by collective bargaining agreements.
The Company considers its employee relations to be satisfactory.


Item 2. Properties.

The principal executive offices of the Company are located at One State
Street Plaza, New York, New York 10004. The telephone number is (212) 668-0340.

Ambac Assurance maintains its principal executive offices at One State
Street Plaza, New York, New York 10004, which consists of approximately 121,000
square feet of office space, under an agreement that expires on September 30,
2019.

Ambac UK maintains its principal offices at Hasilwood House, 60 Bishopgate,
London EC2N4BE, England, which consists of 7,100 square feet of office space,
under an agreement that expires in December 2006.

Cadre maintains its principal executive office at 905 Marconi Avenue,
Ronkonkoma, New York 11779. The Company owns the office building. It consists of
approximately 15,000 square feet of office space and storage.

Item 3. Legal Proceedings.

There are no material lawsuits pending, or to the knowledge of the Company
threatened, to which the Company or any of its majority-owned subsidiaries is a
party.

Item 4. Submission of Matters to a Vote of Security-Holders.

There were no matters submitted to a vote of security holders during the
fourth quarter of 1999.

25
Part II

Item 5. Market for Registrant's Common Equity and Related Stockholder Matters.

Information relating to the principal market on which the Company's Common
Stock is tradable, the high and low sales prices per share for each full
quarterly period within the two most recent fiscal years, and the frequency and
amount of any cash dividends declared for the two most recent fiscal years is
set forth on page 53 of the Company's 1999 Annual Report to Stockholders and
such information is incorporated herein by reference. Information concerning
restrictions on the payment of dividends is set forth in Item 1 above under the
caption "Insurance Regulatory Matters - Wisconsin Dividend Restrictions." As of
March 20, 2000, there were 75 stockholders of record of the Company's Common
Stock, which is listed on the New York Stock Exchange.

Item 6. Selected Financial Data.

Selected financial data for the Company and its subsidiaries for each of
the last five fiscal years is set forth under the captions "Financial
Highlights" and "Five Year Highlights" on pages 4 and 5, respectively, of the
Company's 1999 Annual Report to Stockholders. Such information is incorporated
herein by reference and should be read in conjunction with the Consolidated
Financial Statements and the Notes thereto contained on pages 33 through 51 of
such Annual Report.

Item 7. Management's Discussion and Analysis of Financial Condition and Results
of Operations.


Management's Discussion and Analysis of Financial Condition and Results of
Operations is set forth under the same caption on pages 23 through 31 of the
Company's 1999 Annual Report to Stockholders. Such information is incorporated
herein by reference and should be read in conjunction with the Consolidated
Financial Statements and the Notes thereto contained on pages 33 through 51 of
such Annual Report.

Item 7A. Quantitative and Qualitative Disclosures About Market Risk.

Quantitative and Qualitative Disclosures About Market Risk is set forth
under the caption Risk Management on pages 29 to 31 of the Company's 1999 Annual
Report to Stockholders. Such information is incorporated herein by reference and
should be read in conjunction with the Consolidated Financial Statements and the
Notes thereto contained on pages 33 to 51 of such Annual Report.

Item 8. Financial Statements and Supplementary Data.

The 1999 Consolidated Financial Statements, together with the Notes thereto
and the Independent Auditors' Report thereon, are set forth on pages 32 through
51 of the Company's 1999 Annual Report to Stockholders. Such information is
incorporated herein by reference.

Item 9. Changes in and Disagreements with Accountants on Accounting and
Financial Disclosure.

None.

26
Part III

Item 10. Directors and Executive Officers of the Registrant.

Information relating to the Company's directors and executive officers is
set forth on pages 7, 11, 12, 29 and 30 of the Company's 2000 Proxy Statement
and such information is incorporated herein by reference.

Item 11. Executive Compensation.

Information relating to compensation of the Company's directors and
executive officers is set forth on pages 9 and 10 and on pages 13 to 22 of the
Company's 2000 Proxy Statement and such information is incorporated herein by
reference.

Item 12. Security Ownership of Certain Beneficial Owners and Management.

Information relating to security ownership of certain beneficial owners and
management is set forth on pages 5 to 7 of the Company's 2000 Proxy Statement
and such information is incorporated herein by reference.

Item 13. Certain Relationships and Related Transactions.

None.

Part IV

Item 14. Exhibits, Financial Statement Schedules, and Reports on Form 8-K.

(a) Documents filed as a part of this report:

1. Financial Statements
--------------------

The following consolidated financial statements included in the 1999
Annual Report to Stockholders are incorporated herein by reference
under Part II, Item 8:

<TABLE>
<CAPTION>
Page Number
In Annual Report
--------------------
<S> <C> <C>
Independent Auditors' Report.................................. 32

Consolidated Balance Sheets as of December 31,
1999 and 1998................................................. 33

Consolidated Statements of Operations for each of
the years ended December 31, 1999, 1998 and 1997.............. 34

Consolidated Statements of Stockholders' Equity for each of
the years ended December 31, 1999, 1998 and 1997 35


Consolidated Statements of Cash Flows for each of
the years ended December 31, 1999, 1998 and 1997.............. 36

Notes to Consolidated Financial Statements.................... 37-51
</TABLE>

27
2.   Financial Statement Schedules
-----------------------------

The financial statement schedules filed herein, which are the only
schedules required to be filed, are as follows:

<TABLE>
<CAPTION>
Independent Auditors' Report (Page S-1)
<S> <C> <C> <C> <C>
Schedule I -- Summary of Investments Other Than (Page S-2)
Investments in Related Parties
Schedule II -- Condensed Financial Information of (Pages S-3
Registrant (Parent Company Only) to S-7)
Schedule IV -- Reinsurance (Page S-8)
</TABLE>

3. Exhibits
--------

The following items are annexed as
exhibits:

Exhibit Number Description
- ------------- -----------

3.01 Conformed Amended and Restated Certificate of Incorporation of
the Company filed with the Secretary of State of the State of
Delaware on July 11, 1997. (Filed as Exhibit 4.05 to the
Company's Quarterly Report for the quarter ended September 30,
1997 and incorporated herein by reference.)

3.02 Conformed Copy of the Certificate of Amendment to the Amended
and Restated Certificate of Incorporation of the Company filed
with the Secretary of State of the State of Delaware on May 13,
1998. (Filed as Exhibit 4.04 to the Company's Quarterly Report
for the quarter ended June 30, 1998 and incorporated herein by
reference.)

3.03 By-laws of the Company, as amended through January 28, 1998.
(Filed as Exhibit 3.02 to the Company's Annual Report on Form
10-K for the year ended December 31, 1997 and incorporated
herein by reference.)

4.01 Definitive Engraved Stock Certificate representing shares of
Common Stock. (Filed as Exhibit 4.01 to the Company's Annual
Report on Form 10-K for the year ended December 31, 1997 and
incorporated herein by reference.)

4.02 Indenture, dated as of August 1, 1991, between the Company and
The Chase Manhattan Bank (National Association), Trustee.
(Filed as Exhibit 4.01 to the Company's Registration Statement
on Form S-3 (Reg. No. 33-59290) and incorporated herein by
reference.)

4.03 Indenture dated as of April 1, 1998, between the Company and
First Union National Bank, Trustee. (Filed as Exhibit 5.2 to
the Company's Current Report on Form 8-K dated April 1, 1998
and incorporated herein by reference.)

28
4.04          Rights Agreement, dated as of January 31, 1996,
between Ambac Financial Group, Inc. and Citibank N.A.,
as Rights Agent, including all exhibits thereto.
(Filed as Exhibit 1 to the Company's Registration
Statement on Form 8-A dated February 27, 1996 and
incorporated herein by reference.)

4.05 Form of 9.38% Debenture due August 1, 2011. (Filed as
Exhibit 4.02 to the Registration Statement on Form S-1
(Reg. No. 33-40385) and incorporated herein by
reference.)

4.06 Form of 7.50% Debenture due May 1, 2023. (Filed as
Exhibit 4.06 to the Company's Annual Report on
Form 10-K for the year ended December 31, 1998 and
incorporated herein by reference.)

4.07 Form of 7.08% Debenture due March 31, 2098. (Filed as
Exhibit 5.3 to the Company's Current Report on Form
8-K dated April 1, 1998 and incorporated herein by
reference.)

10.01 Second Amended and Restated Employment Agreement dated
as of December 2, 1997, between the Company and
Phillip B. Lassiter. (Filed as Exhibit 10.01 to the
Company's Annual Report on Form 10-K for the year
ended December 31, 1997 and incorporated herein by
reference.)

10.02 Ambac Financial Group, Inc. 1991 Stock Incentive Plan,
as amended as of December 2, 1997 (Filed as Exhibit
10.02 to the Company's Annual Report on Form 10-K for
the year ended December 31, 1996 and incorporated
herein by reference.)

10.03* Ambac Financial Group, Inc. 1997 Equity Plan, amended
as of October 28, 1997. (Filed as Exhibit 10.03 to the
Company's Annual Report on Form 10-K for the year
ended December 31, 1997 and incorporated herein by
reference.)

10.04* Ambac Financial Group, Inc. 1991 Non-Employee
Directors Stock Plan (Filed as Exhibit 10.09 to the
Company's Annual Report on Form 10-K for the year
ended December 31, 1992 and incorporated herein by
reference.)

10.05* Ambac Financial Group, Inc. 1997 Non-Employee
Directors Equity Plan. (Filed as Exhibit 4.2 to the
Company's Registration Statement on Form S-8 (Reg. No.
333-52449) and incorporated herein by reference.)

10.06* Ambac Financial Group, Inc. 1997 Executive Incentive
Plan. (Filed as Exhibit 10.24 to the Company's
Quarterly Report on Form 10-Q for the period ended
June 30, 1997 and incorporated herein by reference.)

- -----------------
* Management contract or compensatory plan, contract or arrangement required to
be filed as an exhibit pursuant to Item 14(c) of Form 10-K.
---------


29
10.07*          Ambac Financial Group, Inc. Deferred Compensation Plan
for Outside Directors, effective as of December 1,
1993 and amended and restated as of October 26, 1999.
(Filed as Exhibit 10.26 to the Company's Quarterly
Report on Form 10-Q for the period ended September 30,
1999 and incorporated herein by reference.)

10.08* Ambac Financial Group, Inc. 1997 Equity Plan Senior
Officer Deferred Compensation Sub-Plan of the 1997
Equity Plan effective as of October 26, 1999 (Filed as
Exhibit 10.27 to the Company's Quarterly Report on
Form 10-Q for the period ended September 30, 1999 and
incorporated herein by reference.)

10.09* Form of Amended and Restated Management Retention
Agreement dated as of December 2, 1997. (Filed as
Exhibit 10.08 to the Company's Annual Report on Form
10-K for the year ended December 31, 1997 and
incorporated herein by reference.)

10.10* The Ambac Financial Group, Inc. Non-Qualified Savings
Incentive Plan (effective as of January 1, 1995).
(Filed as Exhibit 10.16 to the Company's Quarterly
Report on Form 10-Q for the period ended September 30,
1995, and incorporated herein by reference.)

10.11* Amendment Number 1 to the Ambac Financial Group, Inc.
Non-Qualified Savings Incentive Plan effective as of
April 30, 1997. (Filed as Exhibit 10.10 to the
Company's Annual Report on Form 10-K for the year
ended December 31, 1997 and incorporated herein by
reference.)

10.12* Ambac Financial Group, Inc. Excess Benefits Pension
Plan (Amended and Restated as of January 1, 1994) (As
amended through October 25, 1995). (Filed as Exhibit
10.17 to the Company's Quarterly Report on Form 10-Q
for the period ended September 30, 1995, and
incorporated herein by reference.)

10.13* Amendment Number 1 to the Ambac Financial Group, Inc.
Excess Benefits Pension Plan effective as of April 30,
1997. (Filed as Exhibit 10.12 to the Company's Annual
Report on Form 10-K for the year ended December 31,
1997 and incorporated herein by reference.)

10.14* Supplemental Pension Agreement between the Company and
Philip B. Lassiter dated April 30, 1997. (Filed as
Exhibit 10.24 in the Company's Quarterly Report Form
10-Q for the quarter ended June 30, 1997, and
incorporated herein by reference.)

10.15* Supplemental Pension Agreement between the Company and
David L. Boyle dated April 30, 1997. (Filed as Exhibit
10.25 in the Company's Quarterly Report Form 10-Q for
the quarter ended June 30, 1997, and incorporated
herein by reference.)

10.16* Ambac Financial Group, Inc. Supplemental Pension Plan
(Amended and Restated as of January 1, 1995) (As
amended through October 25, 1995). (Filed as Exhibit
10.18 to the Company's Quarterly Report on Form 10-Q
for the period ended September 30, 1995, and
incorporated herein by reference.)

- ------------------
* Management contract or compensatory plan, contract or arrangement required to
be filed as an exhibit pursuant to Item 14(c) of Form 10-K.
---------


30
10.17*         Amendment Number 1 to the Ambac Financial Group, Inc.
Supplemental Pension Plan effective as of April 30,
1997. (Filed as Exhibit 10.18 to the Company's Annual
Report on Form 10-K for the year ended December 31,
1997 and incorporated herein by reference.)

10.18* Agreement and General Release between Joseph V.
Salzano, the Company and Ambac Assurance Corporation
dated December 29, 1999.

10.19 Lease Agreement, dated as of January 1, 1992 between
South Ferry Building Company and Ambac Assurance
Corporation. (Filed as Exhibit 10.36 to the Company's
Quarterly Report on Form 10-Q for the quarter ended
September 30, 1992 and incorporated herein by
reference.)

10.20 Amendment to Lease Agreement dated August 1, 1997
between South Ferry Building Company and Ambac
Assurance Corporation. (Filed as Exhibit 10.20 to the
Company's Annual Report on Form 10-K for the year
ended December 31, 1997 and incorporated herein by
reference.)

10.21 Tax Settlement Agreement, dated as of March 30, 1993,
among Citicorp, Citibank, N.A., Citicorp Financial
Guaranty Holdings, Inc., Ambac Financial Group, Inc.,
Ambac Assurance Corporation, American Municipal Bond
Holding Company and Health Care Investment Analysts,
Inc. (Filed as Exhibit 10.02 to the Company's
Registration Statement on Form S-3 (Registration No.
33-59290) and incorporated herein by reference.)

10.22 Conformed copy of Amended U.S. $150,000,000 Credit
Agreement, dated as of August 3, 1999 (the "BNS Credit
Agreement") among the Company and Ambac Assurance
Corporation as the Borrowers, Certain Commercial
Lending Institutions as the Lenders, Citibank, N.A.,
as the Documentation Agent, First National Bank of
Chicago, as the Co-Agent, and The Bank of Nova Scotia,
acting through its New York Agency, as the Arranger
and the Administrative Agent. (Filed as Exhibit 10.23
to the Company's Quarterly Report on Form 10-Q for the
period ended June 30, 1999 and incorporated herein by
reference.)

10.23 $750,000,000 Amended and Restated Credit Agreement,
dated December 2, 1999 between Ambac Assurance
Corporation and various banks and Deutsche Bank AG
(New York Branch), as Agent.

10.24 Joint Venture Agreement Ambac Assurance Corporation
and MBIA Insurance Company dated as of September 11,
1995. (Filed as Exhibit 10.22 to the Company's Annual
Report on Form 10-K for the year ended December 31,
1998 and incorporated herein by reference.)

- -------------------------------------------------------------------------------

* Management contract or compensatory plan, contract or arrangement required to
be filed as an exhibit pursuant to Item 14(c) of Form 10-K.
---------


31
<TABLE>
<C> <S> <C>
10.25 Conformed Copy of U.S. $50,000,000 Revolving Credit Agreement, dated as of July
1, 1999 among Ambac Credit Products, LLC, the banks, financial institutions and
other institutional lenders (the "Initial Lenders") listed on the signature
pages thereof, and The Bank of New York, as Agent for the Lenders. (Filed as
Exhibit 10.24 to the Company's Quarterly Report on Form 10-Q for the period
ended June 30, 1999 and incorporated herein by reference.)

12.01 Statement re computation of ratios.

13.01 Annual Report to Stockholders for the fiscal year ended December 31, 1999.
(Furnished for the information of the Securities and Exchange Commission and
not deemed "filed" as part of this Form 10-K except for those portions that are
expressly incorporated by reference.)

21.01 List of Subsidiaries of Ambac Financial Group, Inc.

24.01 Power of Attorney from Phillip B. Lassiter.

24.02 Power of Attorney from Michael A. Callen.

24.03 Power of Attorney from Renso L. Caporali.

24.04 Power of Attorney from Richard Dulude.

24.05 Power of Attorney from W. Grant Gregory.

24.06 Power of Attorney from C. Roderick O'Neil.

27.00 Financial Data Schedule.

99.01 Ambac Assurance Corporation and Subsidiaries Consolidated Financial Statements
(with independent auditors' report thereon) as of December 31, 1999 and 1998.
</TABLE>

(b) Reports on Form 8-K:

There were no reports on Form 8-K filed during the fourth quarter of 1999.
--------
However, on January 27, 2000, the Company filed a Current Report on Form 8-K
--------
with its January 26, 2000 press release containing unaudited financial
information and accompanying discussion for the three months ended December 31,
1999 and the year ended December 31, 1999. On March 13, 2000, the Company filed
a Current Report on Form 8-K containing consolidated financial statements (with
--------
independent auditors' report thereon) of Ambac Assurance Corporation and
Subsidiaries as of December 31, 1999 and 1998. On March 22, 2000, the Company
filed a Current Report on Form 8-K with its March 21, 2000 press release
--------
announcing that the Company and MBIA Inc. had decided to restructure their
international joint venture.

32
SIGNATURES
----------

Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Registrant has caused this report to be signed on its
behalf by the undersigned, thereunto duly authorized.


AMBAC FINANCIAL GROUP, INC.
(Registrant)

Dated: March 30, 2000 By: /s/ Frank J. Bivona
--------------------------------
Name: Frank J. Bivona
Title: Executive Vice President and
Chief Financial Officer


Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed below by the following persons on behalf of the
Registrant and in the capacities and on the dates indicated.

<TABLE>
<CAPTION>

Signature Title Date
- --------- ----- ----
<S> <C> <C>
Phillip B. Lassiter* Chairman, President March 30, 2000
- -------------------------------- and Chief Executive Officer
Phillip B. Lassiter and Director (Principal Executive
Officer)

/s/ Frank J. Bivona Executive Vice President, and March 30, 2000
- -------------------------------- Chief Financial Officer (Principal
Frank J. Bivona Financial and Accounting Officer)

Michael A. Callen* Director March 30, 2000
- --------------------------------
Michael A. Callen

Renso L. Caporali* Director March 30, 2000
- --------------------------------
Renso L. Caporali

Richard Dulude* Director March 30, 2000
- --------------------------------
Richard Dulude

W. Grant Gregory* Director March 30, 2000
- --------------------------------
W. Grant Gregory

C. Roderick O'Neil* Director March 30, 2000
- --------------------------------
C. Roderick O'Neil
</TABLE>
- ---------------------
* Frank J. Bivona, by signing his name hereto, does hereby sign this Annual
Report on Form 10-K on behalf of each of the directors and officers of the
Registrant after whose typed names asterisks appear pursuant to powers of
attorney duly executed by such directors and officers and filed with the
Securities and Exchange Commission as exhibits to this report.

By: /s/ Frank J. Bivona
--------------------------------
Frank J. Bivona
Attorney-in-fact

33
INDEPENDENT AUDITORS' REPORT ON SCHEDULES AND CONSENT


The Board of Directors
Ambac Financial Group, Inc.:


The audits referred to in our report dated January 21, 2000, included the
related financial statement schedules as of December 31, 1999 and 1998 and for
each of the years in the three-year period ended December 31, 1999, included in
this Form 10-K. These financial statement schedules are the responsibility of
the Company's management. Our responsibility is to express an opinion on these
financial statement schedules based on our audits. In our opinion, such
financial statement schedules, when considered in relation to the basic
financial statements taken as a whole, present fairly in all material respects
the information set forth therein.

We consent to the use of our reports incorporated by reference in the
registration statement (No. 333-43695) on Form S-3, and the registration
statements (Nos. 33-47970, 33-63134, 33-47971, 33-44913 and 333-52449) on Form
S-8 of Ambac Financial Group, Inc.



/s/ KPMG LLP
New York, New York
March 30, 2000
AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES
SCHEDULE I - SUMMARY OF INVESTMENTS
Other Than Investments in Related Parties
December 31, 1999
(Dollar Amounts in Thousands)

<TABLE>
<CAPTION>

Amount at which
shown in
Amortized Estimated the balance
Type of Investment Cost Fair Value sheet
- ----------------------------------------------------------------- --------------------- ----------------- ---------------
<S> <C> <C> <C>
U.S. Government obligations...................................... $ 63,197 $ 62,479 $ 62,479
Municipal obligations............................................ 3,094,469 2,962,939 2,962,939
Mortgage- and asset-backed securities (includes U.S. Government
Agency obligations)............................................. 4,776,416 4,704,549 4,704,549

Corporate obligations............................................ 1,094,102 1,008,504 1,008,504
Other............................................................ 220,896 220,896 220,896
--------------------- ------------------- ---------------
Total investments........................................... $9,249,080 $8,959,367 $8,959,367
===================== =================== ===============
</TABLE>



S-1
AMBAC FINANCIAL GROUP, INC.
SCHEDULE II - CONDENSED FINANCIAL INFORMATION
OF REGISTRANT (PARENT COMPANY ONLY)
Condensed Balance Sheets
December 31, 1999 and 1998
(Dollar Amounts in Thousands Except Share Data)



<TABLE>
<CAPTION>
1999 1998
------------------- -----------------
ASSETS

Assets:
<S> <C> <C>
Cash........................................................................ $ 3 $ 116
Investments in subsidiaries................................................. 2,422,278 2,275,995
Fixed income securities, at fair value
(amortized cost of $6,169 in 1999 and $205,456 in 1998).................... 5,695 209,182
Short-term investments, at cost (approximates fair value)................... 12,323 24,144
Other investments........................................................... 3,074 1,522
Current income taxes receivable............................................. 1,913 --
Deferred income taxes receivable............................................ 17,516 12,984
Other assets................................................................ 17,650 23,586
------------------ -----------------
Total assets............................................................... $ 2,480,452 $ 2,547,529
================== =================

LIABILITIES AND STOCKHOLDERS' EQUITY

Liabilities:

Debentures.................................................................. $ 423,995 $ 423,929
Current income taxes payable................................................ -- 1,029
Accrued interest payable.................................................... 6,797 6,797
Accounts payable and other liabilities...................................... 31,210 19,684
------------------ -----------------
Total liabilities.......................................................... 462,002 451,439
------------------ -----------------

Stockholders' equity:

Preferred stock, par value $0.01 per share; authorized shares - 4,000,000;
issued and outstanding shares - none........................................ -- --

Common Stock, par value $0.01 per share; authorized shares - 200,000,000 at
December 31, 1999 and 1998; issued shares - 70,680,384 at December 31, 1999
and 1998.................................................................... 707 707
Additional paid-in capital................................................... 525,012 519,305
Accumulated other comprehensive (loss) income................................ (187,540) 159,313
Retained earnings............................................................ 1,713,446 1,449,832
Common Stock held in treasury at cost, 722,592 shares at December 31, 1999
and 738,381 at December 31, 1998............................................ (33,175) (33,067)
------------------ -----------------
Total stockholders' equity................................................. 2,018,450 2,096,090
------------------ -----------------
Total liabilities and stockholders' equity................................. $ 2,480,452 $ 2,547,529
================== =================
</TABLE>


S-2
AMBAC FINANCIAL GROUP, INC.
SCHEDULE II - CONDENSED FINANCIAL INFORMATION
OF REGISTRANT (PARENT COMPANY ONLY)
Condensed Statements of Operations
Three Years Ended December 31,
(Dollar Amounts in Thousands)



<TABLE>
<CAPTION>
1999 1998 1997
---------------- ---------------- ----------------
Revenues:
<S> <C> <C> <C>
Dividend income........................................... $ 52,000 $ 48,000 $ 44,000
Interest and other income................................. 10,567 14,336 7,047
Net realized gains........................................ 797 2,507 748
---------------- ---------------- ----------------

Total revenues........................................... 63,364 64,843 51,795
---------------- ---------------- ----------------

Expenses:

Interest expense.......................................... 33,470 29,722 19,053
Operating expenses........................................ 6,506 6,815 2,826
---------------- ---------------- ----------------


Total expenses........................................... 39,976 36,537 21,879
---------------- ---------------- ----------------

Income before income taxes and equity in undistributed
net income of subsidiaries................................. 23,388 28,306 29,916

Federal income tax benefit.................................. (10,260) (6,274) (5,433)
---------------- ---------------- ----------------

Income before equity in undistributed net income of
subsidiaries............................................... 33,648 34,580 35,349

Equity in undistributed net income of subsidiaries.......... 274,269 219,414 187,681
---------------- ---------------- ----------------

Net income.................................................. 307,917 253,994 223,030
================ ================ ================
</TABLE>

S-3
AMBAC FINANCIAL GROUP, INC.
SCHEDULE II - CONDENSED FINANCIAL INFORMATION
OF REGISTRANT (PARENT COMPANY ONLY)
Condensed Statements of Stockholders' Equity
Three Years Ended December 31,
(Dollar Amounts in Thousands)

<TABLE>
<CAPTION>
1999 1998 1997
-------------------------- ---------------------- ---------------------
Retained Earnings:

<S> <C> <C> <C> <C> <C> <C>
Balance at January 1 $1,449,832 $1,262,740 $1,072,418
Net income 307,917 $ 307,917 253,994 $253,994 223,030 $223,030
-------------- ------------ ------------
Dividends declared - (29,366) (26,571) (24,165)

Exercise of stock options (14,937) (40,331) (8,543)
------------ ---------- ----------
Balance at December 31 $1,713,446 $1,449,832 $1,262,740
------------ ---------- ----------

Accumulated Other
Comprehensive (Loss) Income:

Balance at January 1 $ 159,313 $ 135,223 $ 58,911
Unrealized (losses) gains on
securities, ($552,645),
$36,476, and $121,347,
pre-tax, in 1999, 1998
and 1997, respectively) (1) (346,211) 23,889 76,155
Foreign currency gain (642) 201 157
------------ ---------- ----------
Other comprehensive (loss) income (346,853) (346,853) 24,090 24,090 76,312 76,312
-------------------------- ---------------------- ----------------------

Total comprehensive (loss) income $(38,936) $278,084 $299,342
============== ============ ============
Balance at December 31 $ (187,540) $ 159,313 $ 135,223
------------ ---------- ----------

Preferred Stock:

Balance at January 1 and
December 31 $ $ $
-- -- --
------------ --------------- --------------

Common Stock:

Balance at January 1 $ 707 $ 707 $ 353
Stock split effected as dividend -- -- 354
------------ --------------- --------------
Balance at December 31 $ 707 $ 707 $ 707
------------ --------------- --------------

Additional Paid-in Capital:

Balance at January 1 $ 519,305 $ 500,107 $ 498,401
Issuance of stock -- -- (3,506)
Exercise of stock options 5,707 19,198 5,566
Stock split effected as dividend -- -- (354)
------------ --------------- --------------
Balance at December 31 $ 525,012 $ 519,305 $ 500,107
------------ --------------- --------------

Common Stock Held in
Treasury at Cost:

Balance at January 1 $ (33,067) $ (26,295) $ (15,067)
Cost of shares acquired (17,626) (52,738) (40,397)
Shares issued under equity plans 17,518 45,966 29,169
Issued to acquire subsidiary -- -- --
------------ --------------- --------------
Balance at December 31 $ (33,175) $ (33,067) $ (26,295)
------------ --------------- --------------

Total Stockholders' Equity at
December 31 $2,018,450 $2,096,090 $1,872,482
============ =============== ==============
</TABLE>

<TABLE>
<CAPTION>
(1) Disclosure of reclassification amount: 1999 1998 1997
------------------------------
<S> <C> <C> <C>
Unrealized holding (losses) gains arising during period $(351,412) $34,526 $88,744
Less: reclassification adjustment for net (losses) gains included in net income (5,201) 10,637 12,589
------------------------------
Net unrealized (losses) gains on securities $(346,211) $23,889 $76,155
==============================
</TABLE>

S-4
AMBAC FINANCIAL GROUP, INC.
SCHEDULE II - CONDENSED FINANCIAL INFORMATION
OF REGISTRANT (PARENT COMPANY ONLY)
Condensed Statements of Cash Flows
Three Years Ended December 31,
(Dollar Amounts in Thousands)



<TABLE>
<CAPTION>
1999 1998 1997
----------------- ---------------- ----------------

Cash flows from operating activities:
<S> <C> <C> <C>
Net income................................................ $ 307,917 $ 253,994 $ 223,030
Adjustments to reconcile net income to net cash provided
by (used in) operating activities:
Equity in undistributed net income of
Subsidiaries............................................. (274,269) (219,414) (187,681)
Gain on sale of investments............................... (797) (2,507) (748)
(Decrease) increase in current income
taxes payable........................................... (2,942) 5,605 (1,510)
Decrease (increase) in other assets.................. 5,936 (13,710) (4,770)
Other, net................................................ (5,188) (16,843) (15,945)
----------------- ---------------- ----------------

Net cash provided by operating activities................ 30,657 7,125 12,376
----------------- ---------------- ----------------

Cash flows from investing activities:
Proceeds from sales of bonds.............................. 16,627 69,097 39,728
Purchases of bonds........................................ (22,625) (206,430) --
Change in short-term investments.......................... 11,821 (10,552) 2,130
Other, net (1,544) (1,489) --
----------------- ---------------- ----------------


Net cash provided by (used in) investing activities.....
4,279 (149,374) 41,858
----------------- ---------------- ----------------

Cash flows from financing activities:
Dividends paid............................................ (29,366) (26,571) (24,165)
Proceeds from issuance of debentures...................... -- 193,700 --
Purchases of treasury stock............................... (17,626) (52,738) (40,397)
Proceeds from sale of treasury stock...................... 17,518 45,966 29,169
Contribution to subsidiaries.............................. (5,575) (18,000) (18,842)
----------------- ---------------- ----------------

Net cash (used in) provided by financing activities.....
(35,049) 142,357 (54,235)
----------------- ---------------- ----------------

Net cash flow............................................... (113) 108 (1)
Cash at January 1......................................... 116 8 9
----------------- ---------------- ----------------

Cash at December 31....................................... $ 3 $ 116 $ 8
================= ================ ================

Supplemental disclosure of cash flow information:
Cash paid during the year for:
Income taxes............................................. $ 37,000 $ 60,000 $ 12,861
================= ================ ================

Interest expense......................................... $ 33,848 $ 30,072 $ 19,687
================= ================ ================

</TABLE>

Supplemental disclosure of non-cash financing activities:

Ambac Financial Group, Inc. contributed fixed income securities to Ambac
Assurance Corporation amounting to $101,479 and $107,533 in April 1999 and
November 1999, respectively.


S-5
AMBAC FINANCIAL GROUP, INC.
SCHEDULE II - CONDENSED FINANCIAL INFORMATION
OF REGISTRANT (PARENT COMPANY ONLY)
Note to Condensed Financial Information



The condensed financial information of Ambac Financial Group, Inc. for the years
ended December 31, 1999, 1998 and 1997, should be read in conjunction with the
consolidated financial statements of Ambac Financial Group, Inc. and
Subsidiaries and the notes thereto. Investments in subsidiaries are accounted
for using the equity method of accounting.



S-6
AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES
SCHEDULE IV - REINSURANCE
(Dollar Amounts in Thousands Except Percentages)



<TABLE>
<CAPTION>
Assumed Percentage of
Ceded to from Amount
Gross Other Other Net Assumed to
Insurance Premiums Written Amount Companies Companies Amount Net
- ---------------------------------------- --------- ---------- --------- -------------- ------------
<S> <C> <C> <C> <C> <C>
Year ended December 31, 1997............ $277,814 $32,452 $ 8,349 $253,711 3.29%
Year ended December 31, 1998............ $333,652 $49,563 $27,359 $311,448 8.78%
Year ended December 31, 1999............ $420,669 $61,845 $24,573 $383,397 6.41%
</TABLE>


S-7
INDEX TO EXHIBITS

Exhibit Number Description
- -------------- -----------
<TABLE>
<C> <S> <C>
10.18 Agreement and General Release between Joseph V. Salzano, the Company
and Ambac Assurance Corporation dated December 29, 1999.

10.23 $750,000,000 Amended and Restated Credit Agreement, dated December
2, 1999 between Ambac Assurance Corporation and various banks and
Deutsche Bank AG (New York Branch), as Agent.

12.01 Statement re computation of ratios.

13.01 Annual Report to Stockholders for the fiscal year ended December 31,
1999. (Furnished for the information of the Securities and Exchange
Commission and not deemed "filed" as part of this Form 10-K except
for those portions that are expressly incorporated by reference.)

21.01 List of Subsidiaries of Ambac Financial Group, Inc.

24.01 Power of Attorney from Phillip B. Lassiter.

24.02 Power of Attorney from Michael A. Callen.

24.03 Power of Attorney from Renso L. Caporali.

24.04 Power of Attorney from Richard Dulude.

24.05 Power of Attorney from W. Grant Gregory.

24.06 Power of Attorney from C. Roderick O'Neil.

27.00 Financial Data Schedule.

99.01 Ambac Assurance Corporation and Subsidiaries Consolidated Financial
Statements (with independent auditors' report thereon) as of
December 31, 1999 and 1998.
</TABLE>