National Grid (NGG) - Market capitalization

Market cap: NZ$132.75 Billion

As of December 2025 National Grid has a market cap of NZ$132.75 Billion. This makes National Grid the world's 285th most valuable company by market cap according to our data. The market capitalization, commonly called market cap, is the total market value of a publicly traded company's outstanding shares and is commonly used to measure how much a company is worth.

Market cap history of National Grid from 2001 to 2025

End of year Market Cap

Year	Marketcap	Change
2025	NZ$132.75 B	28.54%
2024	NZ$103.28 B	30.24%
2023	NZ$79.30 B	14.02%
2022	NZ$69.55 B	-8.18%
2021	NZ$75.74 B	31.69%
2020	NZ$57.51 B	-10.12%
2019	NZ$63.99 B	30.25%
2018	NZ$49.13 B	-12.11%
2017	NZ$55.90 B	-11.8%
2016	NZ$63.38 B	-16.58%
2015	NZ$75.97 B	10.85%
2014	NZ$68.53 B	16.19%
2013	NZ$58.98 B	17.4%
2012	NZ$50.24 B	13.6%
2011	NZ$44.22 B	9.96%
2010	NZ$40.22 B	-3.24%
2009	NZ$41.56 B	-12.74%
2008	NZ$47.63 B	-24%
2007	NZ$62.68 B	-0.85%
2006	NZ$63.21 B	44.95%
2005	NZ$43.61 B	-6.92%
2004	NZ$46.85 B	21.03%
2003	NZ$38.71 B	37.38%
2002	NZ$28.18 B	13.59%
2001	NZ$24.81 B

End of Day market cap according to different sources

On Dec 17th, 2025 the market cap of National Grid was reported to be:

NZ$132.77 Billion

by Nasdaq

NZ$132.75 Billion

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
NiSource NI	NZ$33.84 B	-74.50%	🇺🇸 USA
Consolidated Edison ED	NZ$62.71 B	-52.76%	🇺🇸 USA
DTE Energy DTE	NZ$46.41 B	-65.04%	🇺🇸 USA
Sempra Energy SRE	NZ$98.20 B	-26.03%	🇺🇸 USA
TC Energy TRP	NZ$97.63 B	-26.46%	🇨🇦 Canada
BP BP	NZ$153.11 B	15.33%	🇬🇧 UK
Unitil Corporation UTL	NZ$1.56 B	-98.82%	🇺🇸 USA

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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Market capitalization of National Grid (NGG)

Market cap: NZ$132.75 Billion