Market Cap for Alliant Energy (LNT)
According to Alliant Energy's latest reported financial statements, the company's latest reported market cap is $16.82B USD. Market capitalization is the total dollar value of all outstanding shares — shares outstanding × stock price — and the standard measure of a company's equity value. On this page, historical market cap snaps filing-period share counts to closing prices on or before each statement date (not intraday tick data).
Headline figure above is from the reporting period ending (reported ). Chart and table below cover the full reported history back to .
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Latest period
$16.82B
YoY change
+10.8%
5Y CAGR
+3.8%
Peak year (2026)
$18.56B
Latest annual
$18.56B
Market Cap history chart for Alliant Energy (LNT) from 1985 to 2026
Market Cap history table for Alliant Energy (LNT) from 1985 to 2026
| Fiscal year | Period ended | Reported | Market Cap | YoY |
|---|---|---|---|---|
| 2026 | $18.56B | +10.8% | ||
| 2025 | $16.76B | +10.4% | ||
| 2024 | $15.19B | +16.9% | ||
| 2023 | $12.99B | -6.3% | ||
| 2022 | $13.87B | -10.0% | ||
| 2021 | $15.41B | +20.2% | ||
| 2020 | $12.82B | -2.0% | ||
| 2019 | $13.08B | +32.5% | ||
| 2018 | $9.87B | +0.8% | ||
| 2017 | $9.79B | +13.7% | ||
| 2016 | $8.60B | +22.2% | ||
| 2015 | $7.04B | -4.3% | ||
| 2014 | $7.36B | +28.7% | ||
| 2013 | $5.72B | +17.5% | ||
| 2012 | $4.86B | -0.4% | ||
| 2011 | $4.88B | +20.2% | ||
| 2010 | $4.06B | +21.7% | ||
| 2009 | $3.34B | +3.7% | ||
| 2008 | $3.22B | -29.7% | ||
| 2007 | $4.58B | +3.4% | ||
| 2006 | $4.43B | +35.2% | ||
| 2005 | $3.27B | +0.7% | ||
| 2004 | $3.25B | +28.8% | ||
| 2003 | $2.52B | +68.3% | ||
| 2002 | $1.50B | -38.6% | ||
| 2001 | $2.45B | -3.2% | ||
| 2000 | $2.53B | +17.3% | ||
| 1999 | $2.15B | -13.2% | ||
| 1998 | $2.48B | +142.5% | ||
| 1997 | $1.02B | +18.3% | ||
| 1996 | $864.90M | -8.2% | ||
| 1995 | $942.30M | +12.4% | ||
| 1994 | $838.11M | -13.9% | ||
| 1993 | $973.93M | +6.4% | ||
| 1992 | $915.24M | +4.6% | ||
| 1991 | $874.95M | +33.8% | ||
| 1990 | $653.70M | +0.5% | ||
| 1989 | $650.55M | +6.5% | ||
| 1988 | $610.87M | +6.2% | ||
| 1987 | $575.38M | -13.1% | ||
| 1986 | $662.38M | +24.2% | ||
| 1985 | $533.40M | — |
Market Cap values are taken from Alliant Energy's reported income statements (10-Q quarterly and 10-K annual filings with the U.S. Securities and Exchange Commission). Each row shows the period end date and the date the filing was reported; YoY compares each figure to the same period one year earlier. Amounts are in USD as filed.
Analysis
Alliant Energy (LNT) most recent annual market cap stands at $18.56B (2026) – grew 10.8% year-over-year.
Alliant Energy market cap compound annual growth for the 2021–2026 (5 years) window is +3.8%, sustaining 3 straight years of year-over-year growth.
$18.56B stands as the all-time-high annual market cap, posted in 2026, against a low of $533.40M during 1985.
Within Utilities, Alliant Energy (LNT) ranks 9th among 8 peers we track. The peer median for market cap is $97.46B.
Alliant Energy Market Cap by Year
Alliant Energy Market Cap 2026: $18.56B
Alliant Energy market cap in 2026 was $18.56B, grew 10.8% from 2025. This figure represents the highest annual value in the available history.
Alliant Energy Market Cap 2025: $16.76B
Alliant Energy market cap in 2025 was $16.76B, grew 10.4% from 2024.
Alliant Energy Market Cap 2024: $15.19B
Alliant Energy market cap in 2024 was $15.19B, grew 16.9% from 2023.
Alliant Energy Market Cap 2023: $12.99B
Alliant Energy market cap in 2023 was $12.99B, declined 6.3% below 2022.
Alliant Energy Market Cap 2022: $13.87B
Alliant Energy market cap in 2022 was $13.87B.
See more financial history for Alliant Energy (LNT).
Sector peers — Market Cap
Companies in the same sector as Alliant Energy, ranked by their latest market cap.
| Company | Market Cap | Sector |
|---|---|---|
| GE Vernova Inc. (GEV) | $292.62B | Utilities |
| NextEra Energy, Inc. (NEE) | $201.26B | Utilities |
| The Southern Company (SO) | $106.43B | Utilities |
| Duke Energy Corporation (DUK) | $99.46B | Utilities |
| Constellation Energy Corporation (CEG) | $95.47B | Utilities |
| American Electric Power Company, Inc. (AEP) | $73.70B | Utilities |
| Sempra (SRE) | $60.69B | Utilities |
| Dominion Energy, Inc. (D) | $55.28B | Utilities |
Frequently asked questions
What is Alliant Energy's market cap?
- Latest reported market cap for Alliant Energy (LNT) is $16.82B (period ending December 31, 2025).
How has Alliant Energy market cap changed year-over-year?
- Alliant Energy (LNT) market cap changed +10.8% year-over-year on the latest annual filing.
What is the long-term growth rate of Alliant Energy market cap?
- Alliant Energy (LNT) market cap compound annual growth rate is +3.8% over the most recent 5 years available.
When did Alliant Energy market cap hit its highest annual value?
- Alliant Energy market cap reached its highest annual value of $18.56B in 2026.
What was Alliant Energy market cap in 2025?
- Alliant Energy (LNT) market cap in 2025 was $16.76B.
What was Alliant Energy market cap in 2026?
- Alliant Energy (LNT) market cap in 2026 was $18.56B.
Metrics overview
Pick a metric for charts, filings, and peers — each row shows the latest TTM or annual value with year-over-year change.
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LNT Overview
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