[Form 4] ALLIANT ENERGY CORP Insider Trading Activity

Rhea-AI Filing Summary

Alliant Energy (LNT) reported a director transaction on 10/10/2025. The reporting person acquired 1,070.111 deferred common stock units (Transaction Code: A) in Table II of the filing. The units have a conversion/exercise price of $0 and are designed to be settled in shares of common stock upon the director’s termination of service, per the footnotes.

Following the transaction, the director beneficially owned 15,848.184 derivative securities directly. Footnotes state that amounts include adjustments for accrued dividends through a dividend reinvestment transaction exempt under Rule 16a-11.

Insights

Insider Transactions Analyst

Routine director equity accrual via deferred stock units.

The filing shows a director acquired 1,070.111 deferred common stock units on 10/10/2025, a standard element of board compensation. These units carry a conversion/exercise price of $0 and are intended to settle in common shares upon the end of board service.

Post-transaction beneficial ownership of derivative securities stands at 15,848.184, reflecting ongoing accruals and dividend reinvestment adjustments under Rule 16a-11. The entry is administrative and does not indicate open‑market buying or selling.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

Cox Stephanie

(Last) (First) (Middle)

C/O ALLIANT ENERGY CORPORATION

4902 N. BILTMORE LANE

(Street)

MADISON WI 53718

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
ALLIANT ENERGY CORP [ LNT ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
10/10/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Deferred Common Stock Units	$0	10/10/2025	10/10/2025	A		1,070.111		(1)	(1)	Common Stock	1,070.111	$67.75	15,848.184(2)	D

Explanation of Responses:

1. Units are to be settled in shares of common stock upon the reporting person's termination of services as a director.

2. Includes adjustments for accrued dividends, pursuant to a dividend reinvestment transaction exempt from Section 16 under Rule 16a-11.

Remarks:

	/s/ Jake C. Blavat, Attorney-in-Fact	10/14/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did Alliant Energy (LNT) report in this Form 4?

A director acquired 1,070.111 deferred common stock units on 10/10/2025 (Code A).

How many derivative securities does the director own after the transaction?

The director beneficially owns 15,848.184 derivative securities directly after the transaction.

When will the deferred stock units be settled for Alliant Energy (LNT)?

Per the footnotes, units are settled in shares of common stock upon the director’s termination of service.

What explains the fractional shares in the director’s holdings?

Footnotes state the amount includes accrued dividend adjustments via a dividend reinvestment transaction exempt under Rule 16a-11.

Was there a cash exercise price for the units?

The conversion/exercise price is listed as $0 for the deferred common stock units.