Alliant Energy (LNT) Held by Superinvestors
ALLIANT ENERGY CORP (LNT) is currently held by 3 superinvestors tracked by InsiderSet, with a combined reported market value of approximately $240.91M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Mairs & Power Growth Fund is currently the largest disclosed institutional shareholder of LNT tracked by InsiderSet, reporting ownership valued at approximately $202.77M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $181.77M, representing an estimated loss of -10.36% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 100% of the total disclosed LNT value among the investors covered in this analysis. Major shareholders include Mairs & Power Growth Fund, Renaissance Technologies LLC, Sequoia Financial Advisors, and several other long-term asset managers with concentrated positions in ALLIANT ENERGY CORP (LNT).
This page ranks the largest institutional LNT shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Mairs & Power Growth Fund | Andrew R. Adams | 1.86% | 2,657,913 | $202,772,183 | $181,774,670 | -$20,997,513 | -10.36% |
| Renaissance Technologies LLC | Jim Simons | 0.05% | 477,500 | $36,428,475 | $32,656,225 | -$3,772,250 | -10.36% |
| Sequoia Financial Advisors | 0.01% | 22,426 | $1,710,909 | $1,533,714 | -$177,195 | -10.36% |
Frequently asked questions about LNT
Who are the largest superinvestors holding LNT?
The largest superinvestors holding LNT in the latest SEC Form 13F filings include Mairs & Power Growth Fund, Renaissance Technologies LLC, and Sequoia Financial Advisors. InsiderSet ranks these superinvestors by their latest reported LNT position.
What does the LNT superinvestors page include?
This page tracks LNT positions reported by a curated group of notable institutional investors and fund managers through SEC Form 13F. ALLIANT ENERGY CORP (LNT) on this page reflects disclosed 13F holdings among those superinvestors, not every institutional shareholder of the stock.
How many superinvestors hold LNT?
InsiderSet currently tracks 3 superinvestors reporting LNT holdings in the latest available 13F data. This is the curated set on this page, not the total number of institutions that own LNT.
How much LNT stock do superinvestors hold?
Superinvestors tracked by InsiderSet disclosed approximately $240.91M in LNT holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value, and it covers the curated superinvestors on this page rather than every institutional filer.
When were LNT superinvestor holdings last updated?
The latest LNT superinvestor holdings on InsiderSet are based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time holdings.
Are superinvestor LNT holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by these superinvestors as of the end of the reporting quarter. A superinvestor may have changed its LNT position after the reporting date.
Are superinvestors buying or selling LNT?
Buying and selling can be analyzed by comparing LNT positions across consecutive 13F reporting periods. InsiderSet's LNT Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View LNT ownership changes.
How have superinvestor LNT holdings changed over time?
InsiderSet tracks LNT holdings among these superinvestors across multiple 13F reporting periods, so holder counts, reported value, and reported shares can be compared over time.