Supply breakdown
Shares as of Sep 30, 2026| Category | Shares | % | Value | Status |
|---|---|---|---|---|
| Circulating | 259.36M | 100.0% | $19.79B | Estimated |
| Free float | - | - | - | Unavailable |
| Insider-held, unrestricted | - | - | - | Unavailable |
| Locked team funds | - | - | - | Unavailable |
| Other restricted (unlisted classes only) | - | - | - | Unavailable |
| Total outstanding | 259.36M | 100.0% | $19.79B | Verified |
| Ownership views (overlap the categories above, never added) | ||||
| Institutional holdings (13F) | 253.23M | 97.6% | $19.32B | Estimated |
| Insider-held, all (Forms 3, 4, 5) | - | - | - | Unavailable |
Institutional and insider holdings can include both tradable and locked shares, so they are shown for reference and never added to the total. Check: no class has more shares deducted than it has outstanding, and the review found no shares that may be counted twice: reconciles.
Valuation
- Traditional$19.79B
- Fully diluted$19.89B
- Circulating$19.79B
- Free float-
- Locked team value$0
- Other restricted value$0
Locked and restricted shares
Not reviewed yet.
Institutional holders
13F, quarter ended Jun 30, 2026| Holder | Shares | % of total |
|---|---|---|
| BlackRock, Inc. | 24.99M | 9.63% |
| STATE STREET CORP | 17.57M | 6.78% |
| VANGUARD CAPITAL MANAGEMENT LLC | 16.86M | 6.50% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 14.39M | 5.55% |
| PRICE T ROWE ASSOCIATES INC /MD/ | 11.52M | 4.44% |
| Jupiter Topco LLC | 10.98M | 4.23% |
| Nuveen, LLC | 7.89M | 3.04% |
| GEODE CAPITAL MANAGEMENT, LLC | 7.41M | 2.86% |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 6.94M | 2.67% |
| VICTORY CAPITAL MANAGEMENT INC | 6.44M | 2.48% |
Sum of long share positions in Form 13F reports for the quarter. 13F covers managers with over $100M in US equities; some positions are reported by more than one filer.
Insiders
Forms 3, 4 and 5Form 4 aggregation pending
Share classes
| Class | Listing | Shares outstanding | As of |
|---|---|---|---|
| Common stock | LNT on Nasdaq | 259,361,652 | Sep 30, 2026 |
Notes and sources
- ALLIANT ENERGY CORP 10-Q for period ended 2026-09-30, Cover page (0000352541-26-000047)
- SEC public float (non-affiliates): $15.50B as of Jun 30, 2025, from the 10-K cover. It is a dollar value at a past date, not circulating supply.