With a market capitalization (market cap) of $18.9B — a measure of how much the company is worth — NiSource Inc ranks #610 among the 2,510 companies tracked, and 33rd in Utilities as of October 3, 2026. Shares trade at $39.43, down 0.18% on the day.
of 2,510 tracked
Market-cap change uses historical capitalization records. Share-price returns are a different series — they can diverge when the share count changes. Those returns are not a CAGR until you pick a start value, an ending value, and years. CAGR calculator. Market cap vs. stock price.
Year-end values and the chart both come from historical market-cap records, not from applying today's share count to past prices. Latest historical observation October 2, 2026. Ranking headline cap is the snapshot figure as of October 3, 2026.
| Year | As of | Market cap | Annual change | Year-end close |
|---|---|---|---|---|
| 2026 | Oct 2, 2026 | $18.91B | -5.44% | $39.43 |
| 2025 | Dec 31, 2025 | $20B | +15.68% | $41.76 |
| 2024 | Dec 31, 2024 | $17.29B | +54.40% | $36.76 |
| 2023 | Dec 29, 2023 | $11.2B | -0.37% | $26.55 |
| 2022 |
Ranking figure $18.9B as of October 3, 2026.
NiSource Inc's ranking market cap is the provider-reported capitalization on the same snapshot as the rest of this site, with a share price of $39.43 as of October 2, 2026. Charts and the year-end table use a separate historical market-cap series, last observed at $18.91B on October 2, 2026. See how the ranking works.
Live shares outstanding are not on the quote used for price, so this page does not invent a current share count. Shares outstanding vs. float.
The latest annual report (FY 2025) used a weighted-average 472,900,000 shares. That figure is an average for the year, not the live count in the market-cap formula.
Book equity: assets minus liabilities on the latest annual report.
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Not in this snapshot
FY 2025 net worth
Largest U.S.-listed names in the same FMP sector — not a hand-picked competitor set.
| Rank | Company | Market cap | 1D |
|---|---|---|---|
| #97 | NextEra Energy, Inc. NEE | $160.27B | +0.64% |
| #146 | Southern Company (The) Series 2 SOJE | $105.93B | +1.45% |
| #163 | The Southern Company |
NiSource Inc., an energy holding company, operates as a regulated natural gas and electric utility company in the United States. It operates in two segments, Columbia Operations and NIPSCO Operations. The company provides natural gas to residential, commercial, and industrial customers through approximately 37,300 miles of distribution main pipeline and the associated individual customer service lines; and 310 miles of transmission main pipeline in Ohio, Pennsylvania, Virginia, Kentucky, and Maryland.
Summary from the company profile (Financial Modeling Prep). Principal financial figures above are for FY 2025.
Visit websiteAs of October 3, 2026, NiSource Inc (NI) is worth $18.9B — that is its market capitalization, the total value of its outstanding shares on MarketCapLens.
A company’s net worth is its shareholders’ equity: assets minus liabilities on the balance sheet. That is book equity, not market cap. For FY 2025, NiSource Inc’s book equity is about $11.66B. Market cap is the market value of the outstanding shares. As of October 3, 2026, its market cap is $18.9B. Book equity is an accounting remainder; market cap is a trading value. Neither is a person’s net worth.
NiSource Inc ranks #610 among the 2,510 companies tracked on MarketCapLens. In Utilities it ranks #33 of 87.
Fundamentals are annual. Figures labeled with their fiscal year. Live ratios use the current price against those annual earnings.
| Dec 30, 2022 |
| $11.24B |
| +0.28% |
| $27.42 |
| 2021 | Dec 31, 2021 | $11.21B | — | $27.61 |
|---|
Last observation of each calendar year from historical market-cap records. The current year is through the latest date, not a completed year-end. Share-price close is the matching session for context — we do not rebuild cap from today's share count.
Not in this snapshot
FY 2025
| $98.85B |
| +0.16% |
| #181 | Constellation Energy Corporation CEG | $92.47B | -0.55% |
| #189 | Duke Energy Corporation DUK | $88.98B | +0.34% |
| #218 | National Grid plc NGG | $76.53B | +1.05% |
Companies immediately above and below in the overall ranking. They may be in a different sector.
| Rank | Company | Market cap | 1D |
|---|---|---|---|
| #607 | Snap-on Incorporated SNA | $19.08B | +0.32% |
| #608 | Unity Software Inc. U | $19.04B | -0.01% |
| #609 | LyondellBasell Industries N.V. LYB | $18.91B | +1.40% |
| #611 | MKS Inc. MKSI | $18.85B | +2.92% |
| #612 | The Southern Company JR 2017B NT 77 SOJC | $18.8B | +0.05% |
| #613 | First Solar, Inc. FSLR | $18.77B | +1.45% |
NiSource Inc’s ranking market cap of $18.9B comes from the same snapshot as the rest of this site, as of October 3, 2026. It is not share price multiplied by the FY 2025 weighted-average share count of 472,900,000. The historical market-cap series last observed $18.91B on October 2, 2026.
Over the past year, NiSource Inc’s market cap is down 7.20%, using historical market-cap records rather than today’s share count applied to past prices.
NiSource Inc (NI) shares trade at $39.43, down 0.18% on the day, as of October 3, 2026.
NiSource Inc trades at a live price-to-earnings (P/E) ratio of 20.1, using the latest share price divided by the latest annual earnings per share. That is not the same as a fiscal-year reported P/E.