Alliant Energy Corporation (LNT)
Nasdaq: LNT · Electric & Other Services Combined · Madison, WI · filing with the SEC since 1994
Grade5.3
◀ Past 5.2● Present 5.7▶ Future 4.9
Who owns Alliant Energy Corporation
As filed with the SECHolders of 5% or more
2
Vanguard Capital Management holds 7.54% of Common Stock, as its SCHEDULE 13G filed Apr 29, 2026 says.
Directors and officers
16
report now, of 32 people on the record since 2006. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 2 named at left.
Holders of 5% or moreshare of the class, as filed
Vanguard Capital Management
SCHEDULE 13G · filed Apr 29, 2026 · Common Stock
Vanguard Portfolio Management
SCHEDULE 13G · filed Apr 28, 2026 · Common Stock
The Vanguard Group
SCHEDULE 13G/A · filed Mar 26, 2026 · Common Stock · reported falling below 5%
What LNT reports owning in othersstakes of 5% or more, and other ties
Other ties the annual report names
Ipl
An entity · legal entity · owns, named in the 10-K filed Feb 20, 2026
Wpl
An entity · legal entity · owns, named in the 10-K filed Feb 20, 2026
Investment in Atc
An investee · investee · invested in, named in the 10-K filed Feb 20, 2026
Totals
An investee · investee · invested in, named in the 10-K filed Feb 20, 2026
Wind Investment in Oklahoma
An investee · investee · invested in, named in the 10-K filed Feb 20, 2026
2 subsidiaries in 1 country, from the list filed with the 10-K filed Feb 20, 2026.
Insider tradesForm 4
1sales
0purchases
0sales on a scheduled plan
1people selling
$0sold, in dollars
$0bought, in dollars
Open-market trades on Form 4 from Oct 14, 2025 to Oct 14, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Oct 14, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window1 of 32 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Durian Robert J | EVP and CFO | 1 | $0 | 0 | 0 | $0 |