Alliant Energy LNT
Alliant Energy is the 419th largest S&P 500 company by market cap, worth $18.1 billion. 9 directors have filed with the SEC in the last 12 months (who counts), 1 of them an executive. 7 other officers are on file. At 30 Jun 2026, Vanguard was its largest institutional holder, with 13.2% of the company.
- CEO
- Lisa M. Barton
- Sector
- Utilities
- Sub-industry
- Electric Utilities
- Headquarters
- Madison, Wisconsin
- Founded
- 1917
- More
- Wikipedia
- Market cap
- $18.1B
- 419th largest, 23 Oct 2026 close
- Price to sales
- 4.1
- Market cap over revenue
- Market cap per employee
- $6.1M
- Market cap over employees
- Connections
- 0
- S&P 500 companies sharing a director or officer
Largest institutional holders
Each fund group's share of Alliant Energy. Where a company has several share classes, the share is of its total value.
13F filings for the quarter to 30 Jun 2026
Board and officers
Roles filed up to 30 Sep 2026
| Name | Title |
|---|---|
| Directors (9) | |
| Lisa M. BartonPresident and CEOLast filed 23 Feb 2026 | |
| Patrick E. AllenDirector | |
| Manu AsthanaDirector | |
| Ignacio A. CortinaDirector | |
| Stephanie CoxDirector | |
| Nancy Joy FaloticoDirector | |
| Michael Dennis GarciaDirector | |
| Roger K. NewportDirector | |
| Christie RaymondDirector | |
| Officers (7) | |
| Robert J. DurianEVP and CFOLast filed 12 Aug 2026 | |
| Mayuri FarlingerVice PresidentLast filed 23 Feb 2026 | |
| David A. de LeonSenior Vice PresidentLast filed 23 Feb 2026 | |
| Antonio P. SmythExecutive Vice PresidentLast filed 16 Apr 2026 | |
| Raja SundararajanExecutive Vice PresidentLast filed 23 Feb 2026 | |
| Dylan SyseCAO and ControllerLast filed 23 Feb 2026 | |
| Rebecca C. ValcqVice PresidentLast filed 19 Mar 2026 | |
Alliant Energy's market cap since December 2008
Weekly, up to 23 Oct 2026
| Week ending | Market cap |
|---|---|
| 23 Oct 2026 | $18.1B |
| 26 Dec 2025 | $16.8B |
| 27 Dec 2024 | $15.3B |
| 29 Dec 2023 | $13.1B |
| 30 Dec 2022 | $13.9B |
| 31 Dec 2021 | $15.4B |
| 25 Dec 2020 | $12.5B |
| 27 Dec 2019 | $13.1B |
| 28 Dec 2018 | $9.9B |
| 29 Dec 2017 | $9.8B |
| 30 Dec 2016 | $8.6B |
| 25 Dec 2015 | $7.1B |
| 26 Dec 2014 | $7.6B |
| 27 Dec 2013 | $5.7B |
| 28 Dec 2012 | $4.8B |
| 30 Dec 2011 | $4.9B |
| 31 Dec 2010 | $4.1B |
| 25 Dec 2009 | $3.4B |
| 26 Dec 2008 | $3.1B |
Download Alliant Energy's data as JSON, with the weekly market caps in billions of dollars from 5 Dec 2008.
Workforce
Headcount at 31 Dec 2025
- Employees
- 2,948
Employees - At December 31, 2025, Alliant Energy, IPL and WPL had the following full- and part-time employees: … Alliant Energy 2,948
Insider trades
Open-market buys and sales by directors and officers. Grants, option exercises and shares withheld for tax are left out.
Trades from 30 Sep 2025 to 30 Sep 2026
Directors and officers sold $7 of stock in 1 sale and made no open-market purchases in the 12 months to 30 Sep 2026.
| Date | Person | Value |
|---|---|---|
| 10 Aug 2026Sale | Robert J. DurianEVP and CFO | $7 |
Trades by members of Congress and officials
Trades members of Congress and senior executive branch officials disclosed, including their families'. Amounts are filed as ranges.
Trades from 20 Oct 2023 to 20 Oct 2026
3 people disclosed 4 purchases and 2 sales of Alliant Energy stock since October 2023.
| Date | Member or official | Amount |
|---|---|---|
| 25 Sep 2026 | Rohit KhannaHouse, D-CA · Sold | $1K to $15K |
| 15 Apr 2026 | Donald J TrumpPresident · Bought | $1K to $15K |
| 29 Jan 2026 | Rohit KhannaHouse, D-CA · Bought | $1K to $15K |
| 23 Jan 2026 | Donald J TrumpPresident · Bought | $1K to $15K |
| 13 Aug 2025 | Lisa McClainHouse, R-MI · Sold | $1K to $15K |
| 4 Aug 2025 | Lisa McClainHouse, R-MI · Bought | $1K to $15K |
Not on file: no director or officer shared with another S&P 500 company and no WARN layoff notices under its own name since October 2023.