With a market capitalization (market cap) of $16.61B — a measure of how much the company is worth — Alliant Energy Corporation ranks #672 among the 2,510 companies tracked, and 38th in Utilities as of October 2, 2026. Shares trade at $64.33, up 0.97% 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 2, 2026.
| Year | As of | Market cap | Annual change | Year-end close |
|---|---|---|---|---|
| 2026 | Oct 2, 2026 | $16.63B | -0.62% | $64.33 |
| 2025 | Dec 31, 2025 | $16.73B | +10.18% | $65.01 |
| 2024 | Dec 31, 2024 | $15.19B | +15.82% | $59.14 |
| 2023 | Dec 29, 2023 | $13.11B | -5.42% | $51.30 |
Ranking figure $16.61B as of October 2, 2026.
Alliant Energy Corporation's ranking market cap is the provider-reported capitalization on the same snapshot as the rest of this site, with a share price of $64.33 as of October 2, 2026. Charts and the year-end table use a separate historical market-cap series, last observed at $16.63B 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 257,000,000 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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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 |
Alliant Energy Corporation functions as a utility holding company, specializing in the provision of regulated electricity and natural gas services. Its operational structure is divided into three principal segments: Utility Electric Operations, Utility Gas Operations, and Utility Other. Through its primary subsidiary, Interstate Power and Light Company (IPL), the corporation generates and distributes electricity, and manages the distribution and transportation of natural gas to retail customers throughout Iowa.
Summary from the company profile (Financial Modeling Prep). Principal financial figures above are for FY 2025.
Visit websiteAs of October 2, 2026, Alliant Energy Corporation (LNT) is worth $16.61B — 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, Alliant Energy Corporation’s book equity is about $7.33B. Market cap is the market value of the outstanding shares. As of October 2, 2026, its market cap is $16.61B. Book equity is an accounting remainder; market cap is a trading value. Neither is a person’s net worth.
Alliant Energy Corporation ranks #672 among the 2,510 companies tracked on MarketCapLens. In Utilities it ranks #38 of 87.
Fundamentals are annual. Figures labeled with their fiscal year. Live ratios use the current price against those annual earnings.
| 2022 |
|---|
| Dec 30, 2022 |
| $13.86B |
| -10.00% |
| $55.21 |
| 2021 | Dec 31, 2021 | $15.4B | — | $61.47 |
|---|
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.
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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 |
|---|---|---|---|
| #669 | Ovintiv Inc. OVV | $16.69B | +0.60% |
| #670 | Rogers Communications Inc. RCI | $16.66B | +0.36% |
| #671 | PTC Inc. PTC | $16.64B | -1.67% |
| #673 | Fabrinet FN | $16.61B | +2.71% |
| #674 | Equifax Inc. EFX | $16.45B | +0.19% |
| #675 | DigitalOcean Holdings, Inc. DOCN | $16.38B | +0.19% |
Alliant Energy Corporation’s ranking market cap of $16.61B comes from the same snapshot as the rest of this site, as of October 2, 2026. It is not share price multiplied by the FY 2025 weighted-average share count of 257,000,000. The historical market-cap series last observed $16.63B on October 2, 2026.
Over the past year, Alliant Energy Corporation’s market cap is down 2.46%, using historical market-cap records rather than today’s share count applied to past prices.
Alliant Energy Corporation (LNT) shares trade at $64.33, up 0.97% on the day, as of October 2, 2026.
Alliant Energy Corporation trades at a live price-to-earnings (P/E) ratio of 20.4, 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.