Antonio P. Smyth - 19 Feb 2026 Form 4 Insider Report for ALLIANT ENERGY CORP (LNT)

Role: Executive Vice President
Signature: /s/ Jake C. Blavat, Attorney-in-Fact
Issuer symbol: LNT
Transactions as of: 19 Feb 2026
Net transactions value: -$435,882
Form type: 4
Filing time: 23 Feb 2026, 19:09:48 UTC
Previous filing: 16 Apr 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Smyth Antonio P	Executive Vice President	C/O ALLIANT ENERGY CORPORATION, 4902 N. BILTMORE LANE, MADISON	/s/ Jake C. Blavat, Attorney-in-Fact	23 Feb 2026	0001973120

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	LNT	Common Stock	Award	$0	+13,114	+135%	$0.000000	22,841	19 Feb 2026	Direct
transaction	LNT	Common Stock	Award	$0	+5,240	+23%	$0.000000	28,081	19 Feb 2026	Direct	F1
transaction	LNT	Common Stock	Tax liability	$435,882	-6,226	-22%	$70.01	21,855	19 Feb 2026	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents restricted stock units (RSUs) which are converted to common stock on a one-to-one basis when vested. The RSUs vest on December 31, 2028.