NiSource (NI) - Market capitalization

Market cap: £14.74 Billion

As of December 2025 NiSource has a market cap of £14.74 Billion. This makes NiSource the world's 1129th 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 NiSource from 1996 to 2025

End of year Market Cap

Year	Marketcap	Change
2025	£14.74 B	7.82%
2024	£13.67 B	58.71%
2023	£8.61 B	-6.4%
2022	£9.20 B	14.6%
2021	£8.03 B	24.55%
2020	£6.44 B	-20.51%
2019	£8.11 B	9.1%
2018	£7.43 B	16.25%
2017	£6.39 B	10.47%
2016	£5.79 B	37.84%
2015	£4.20 B	-51.21%
2014	£8.61 B	37.72%
2013	£6.25 B	30.86%
2012	£4.77 B	10.96%
2011	£4.30 B	35.3%
2010	£3.18 B	21.06%
2009	£2.62 B	28.09%
2008	£2.05 B	-21.26%
2007	£2.60 B	-22.57%
2006	£3.36 B	2.1%
2005	£3.29 B	2.7%
2004	£3.21 B	-0.31%
2003	£3.22 B	3.36%
2002	£3.11 B	-5.24%
2001	£3.28 B	-22.34%
2000	£4.23 B	208.38%
1999	£1.37 B	-36.17%
1998	£2.15 B	15.01%
1997	£1.87 B	35.16%
1996	£1.38 B

End of Day market cap according to different sources

On Dec 9th, 2025 the market cap of NiSource was reported to be:

£14.86 Billion

by Nasdaq

£14.74 Billion

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
Sempra Energy SRE	£43.33 B	193.95%	🇺🇸 USA
Duke Energy DUK	£67.37 B	356.98%	🇺🇸 USA
Atmos Energy ATO	£20.21 B	37.10%	🇺🇸 USA
Chesapeake Utilities CPK	£2.23 B	-84.84%	🇺🇸 USA
Genie Energy GNE	£0.28 B	-98.08%	🇺🇸 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 NiSource (NI)

Market cap: £14.74 Billion