Alliant Energy Corp
Ownership
Ownership Structure
Who owns Alliant Energy Corp (LNT)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.7% of the shares are freely tradable; institutional investors hold 94.0%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 9.45 | 24,499,440 | +0.7 | 03/31/2026 |
| State Street Corp | 6.56 | 17,010,651 | +0.8 | 03/31/2026 |
| Vanguard Capital Management, LLC | 6.44 | 16,699,462 | +0.0 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 5.63 | 14,595,006 | +0.0 | 03/31/2026 |
| HHG PLC | 4.35 | 11,273,621 | +1.2 | 03/31/2026 |
| T. Rowe Price Associates, Inc. | 4.09 | 10,610,646 | +26.4 | 03/31/2026 |
| Nuveen, LLC | 2.87 | 7,440,386 | +0.6 | 03/31/2026 |
| Geode Capital Management, LLC | 2.80 | 7,258,026 | +2.6 | 03/31/2026 |
| Massachusetts Financial Services Company | 2.72 | 7,047,237 | -1.8 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 3.17 | 8,218,294 | +0.2 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Durian Robert J | EVP and CFO | 158,146 | 10,374,374 $ | Aug 10, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 10, 2026 | Durian Robert J | EVP and CFO | Sell | 0 | 68.60 | 0 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 18, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.