960 institutions reported holding $20.11B of ALLIANT ENERGY CORP (LNT) in SEC 13F filings for 2026-06-30. Largest institutional holders: VANGUARD GROUP INC ($2.60B), BlackRock, Inc. ($1.95B), STATE STREET CORP ($1.34B), PRICE T ROWE ASSOCIATES INC /MD/ ($878.5M), Jupiter Topco LLC ($837.5M). Source: SEC Form 13F.
Source: SEC Form 13F filings · as of 2026-06-30