Number of shares outstanding for iShares MBS ETF (MBB)

Number of shares outstanding as of December 5th, 2025: 410,600,000

According to the information available on iShares MBS ETF's website, the funds's current number of shares outstanding is 410,600,000.

Outstanding shares history for iShares MBS ETF

What is the market capitalization of a company?

The market capitalization sometimes referred as Marketcap, is the value of a publicly listed company.
In most cases it can be easily calculated by multiplying the share price with the amount of outstanding shares.

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