Alliant Energy
Provides regulated electricity and natural gas service across Iowa and Wisconsin.
$68.03
After-hours close+0.01 (+0.01%)
At close$68.02(−0.28%)
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Breakdown13F · Form 4
Institutions 107.72%Insiders 0.15%
A 13F quarter can total more than the shares outstanding — sub-advisers file the same block twice, and a filer's own share count can be a quarter stale. No split is drawn from it.
Shares outstanding 258.28M · Float 257.85M · 99.8% free float
Institutions13F, as of Jun 30, 2026
893 holders · 278.23M shares · 99 new positions · 467 increased · 249 reduced · 75 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 24.99M | 9.67% | +487.2K | Aug 7, 2026 |
| State Street Corp | 17.57M | 6.80% | +561.3K | Aug 7, 2026 |
| Vanguard Capital Management LLC | 16.86M | 6.53% | +162.3K | Aug 13, 2026 |
| Vanguard Portfolio Management LLC | 14.39M | 5.57% | −208.8K | Aug 13, 2026 |
| Price T Rowe Associates Inc /MD/ | 11.52M | 4.46% | +904.7K | Aug 14, 2026 |
| Jupiter Topco LLC | 10.98M | 4.25% | +10.98Mnew | Aug 14, 2026 |
| Nuveen, LLC | 7.89M | 3.06% | +450.6K | Aug 11, 2026 |
| Geode Capital Management, LLC | 7.41M | 2.87% | +149.4K | Aug 12, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Vanguard Capital Management | 7.54% | 19.40M | 13G | Apr 29, 2026 ↗ |
| State Street Corporation | 6.30% | 16.24M | Oct 16, 2024 ↗ | |
| Vanguard Portfolio Management | 5.68% | 14.63M | 13G | Apr 28, 2026 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Robert J. Durian | officer: EVP and CFO | 158.1K | 0.06% | Aug 12, 2026 |
| Lisa M. Barton | director, officer: President and CEO | 106.5K | 0.04% | Feb 23, 2026 |
| David A. de Leon | officer: Senior Vice President | 47.7K | 0.02% | Feb 23, 2026 |
| Raja Sundararajan | officer: Executive Vice President | 33.1K | 0.01% | Feb 23, 2026 |
| Antonio P. Smyth | officer: Executive Vice President | 20.7K | 0.01% | Apr 16, 2026 |
| Mayuri Farlinger | officer: Vice President | 10.4K | 0.00% | Feb 23, 2026 |
| Dylan Syse | officer: CAO and Controller | 3.8K | 0.00% | Feb 23, 2026 |
| Rebecca C. Valcq | officer: Vice President | 2.3K | 0.00% | Mar 19, 2026 |
| Manu Asthana | director | 1.0K | 0.00% | Mar 4, 2026 |
26 people have not refiled in the last 18 months (1.16M shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 10, 2026 | Robert J. Durianofficer: EVP and CFO | Sale | 0 | $68.60 | 158,146 |
CongressHouse and Senate disclosures
Not reported.