Alliant Energy Corporation (LNT) Shareholders & Insider Trades
Alliant Energy shareholders at a glance
The largest holder of Alliant Energy stock is BlackRock Advisors LLC, with 21.3 million shares (8.22% of the company), worth about $1.45 billion as of September 25, 2026. The 10 largest holders together own 46.8%.
In Q2 2026, 907 institutional holdings reports listed shares worth $19.70 billion.
Insiders reported 17 transactions in the last two years: no sales and no purchases. The newest one on file is from February 19, 2026 (De Leon David A., Officer).
Major holders as of September 25, 2026; quarterly totals from institutional holdings reports (latest Q2 2026); insider transactions on file through February 19, 2026.
Alliant Energy Corporation
Shareholders Summary
2026Q2
Ownership by Type
Geographic Distribution
Largest Alliant Energy shareholders
| Holder | Shares | % of company | Value |
|---|---|---|---|
| BlackRock Advisors LLC | 21.3 million | 8.22% | $1.4B |
| State Street Corporation | 17.6 million | 6.78% | $1.2B |
| Vanguard Capital Management LLC | 16.9 million | 6.50% | $1.1B |
| Vanguard Portfolio Management LLC | 14.4 million | 5.55% | $978.0M |
| T. Rowe Price International Ltd. | 11.5 million | 4.44% | $783.0M |
| Janus Henderson Investors US LLC | 11.0 million | 4.23% | $746.0M |
| Teachers Advisors LLC | 7.9 million | 3.04% | $536.0M |
| Geode Capital Management LLC | 7.4 million | 2.86% | $504.0M |
| MFS Investment Management Canada Ltd. | 6.9 million | 2.67% | $472.0M |
| Victory Capital Management, Inc. (Investment Management) | 6.4 million | 2.48% | $438.0M |
As of September 25, 2026.
Alliant Energy institutional holdings by quarter
| Quarter | Reports | Shares | Value |
|---|---|---|---|
| Q2 2026 | 907 | – | $19.7B |
| Q1 2026 | 874 | 239.0 million | $17.1B |
| Q4 2025 | 852 | 232.0 million | $15.1B |
| Q3 2025 | 812 | 225.0 million | $15.1B |
| Q2 2025 | 795 | 214.0 million | $12.9B |
| Q1 2025 | 801 | 209.0 million | $13.4B |
| Q4 2024 | 733 | 214.0 million | $12.8B |
| Q3 2024 | 699 | 209.0 million | $12.7B |
Shares and value held by institutions that file quarterly holdings reports (options not included).
Alliant Energy insider trades
| Insider | Date | Title | Transaction | Value |
|---|---|---|---|---|
| De Leon David A. | Feb 19, 2026 | Officer | Stock Award(Grant) at price 0.00 per share. | – |
| Sundararajan Raja | Feb 19, 2026 | Officer | Stock Award(Grant) at price 0.00 per share. | – |
| Smyth Antonio P | Feb 19, 2026 | Officer | Stock Award(Grant) at price 0.00 per share. | – |
| Farlinger Mayuri | Feb 19, 2026 | Officer | Stock Award(Grant) at price 0.00 per share. | – |
| Syse Dylan | Feb 19, 2026 | Officer | Stock Award(Grant) at price 0.00 per share. | – |
| Valcq Rebecca C | Feb 19, 2026 | Officer | Stock Award(Grant) at price 0.00 per share. | – |
| Durian Robert J. | Feb 19, 2026 | Chief Financial Officer | Stock Award(Grant) at price 0.00 per share. | – |
| Barton Lisa M. J.D. | Feb 19, 2026 | Chief Executive Officer | Stock Award(Grant) at price 0.00 per share. | – |
| Smyth Antonio P | Apr 15, 2025 | Officer | Stock Award(Grant) at price 0.00 per share. | – |
| Sundararajan Raja | Feb 20, 2025 | Officer | Stock Award(Grant) at price 0.00 per share. | – |
| Farlinger Mayuri | Feb 20, 2025 | Officer | Stock Award(Grant) at price 0.00 per share. | – |
| Larsen John O | Feb 20, 2025 | Director | Stock Award(Grant) at price 0.00 per share. | – |
Newest 12 of 17 insider transactions in the last two years.
Questions and answers
Who owns the most Alliant Energy stock?
BlackRock Advisors LLC, with 8.22% of the company (as of September 25, 2026). Next: State Street Corporation (6.78%) and Vanguard Capital Management LLC (6.50%).
How many institutions own Alliant Energy stock?
907 institutional holdings reports listed Alliant Energy shares in Q2 2026 worth $19.70 billion.
Are Alliant Energy insiders buying or selling the stock?
In the last two years insiders reported no sales and no purchases (17 transactions in all); the newest on file is from February 19, 2026.
