Deferred stock units awarded to Alliant Energy (LNT) director

Rhea-AI Filing Summary

Alliant Energy Corp director Ignacio A. Cortina received a grant of deferred stock units, acquiring 666.895 Deferred Common Stock Units at an assigned value of $73.10 per unit. Following this award, his total deferred units position is 10,227.316, held directly.

The units represent Deferred Common Stock and will be settled in shares of common stock when Cortina’s service as a director ends. The reported total also reflects adjustments for accrued dividends through a dividend reinvestment transaction exempt from Section 16 under Rule 16a-11.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Cortina Ignacio A

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Deferred Common Stock Units	666.895	$73.10	$49K

Holdings After Transaction: Deferred Common Stock Units — 10,227.316 shares (Direct)

Footnotes (1)

1. Units are to be settled in shares of common stock upon the reporting person's termination of services as a director. Includes adjustments for accrued dividends, pursuant to a dividend reinvestment transaction exempt from Section 16 under Rule 16a-11.

Key Figures

Deferred units granted: 666.895 units Grant value per unit: $73.10 per unit Total deferred units after grant: 10,227.316 units +1 more

4 metrics

Deferred units granted 666.895 units Deferred Common Stock Units grant on April 10, 2026

Grant value per unit $73.10 per unit Assigned value for Deferred Common Stock Units grant

Total deferred units after grant 10,227.316 units Deferred Common Stock Units held directly after transaction

Conversion price $0.00 Conversion or exercise price for Deferred Common Stock Units

Key Terms

Deferred Common Stock Units, Deferred Common Stock, dividend reinvestment transaction, Section 16, +1 more

5 terms

Deferred Common Stock Units financial

"security_title: "Deferred Common Stock Units""

Deferred common stock units are promises to deliver company shares or cash tied to the company’s stock value at a later date, typically used as part of employee or executive pay. Think of them like a paycheck you elect to receive in company stock at a future date; they can affect the number of shares outstanding and company expenses, so investors watch them for potential dilution and to understand management’s incentives.

Deferred Common Stock financial

"underlying_security_title: "Deferred Common Stock""

dividend reinvestment transaction financial

"Includes adjustments for accrued dividends, pursuant to a dividend reinvestment transaction exempt"

Section 16 regulatory

"dividend reinvestment transaction exempt from Section 16 under Rule 16a-11"

Section 16 is a U.S. securities law rule that governs the trading and disclosure obligations of company insiders — typically officers, directors and large shareholders — to promote transparency and deter unfair profit-taking. It requires insiders to publicly report their stock trades and allows companies or the issuer to reclaim quick, short-term profits from certain insider trades, like a scoreboard and a refund policy that help investors see and limit possible insider advantage.

Rule 16a-11 regulatory

"dividend reinvestment transaction exempt from Section 16 under Rule 16a-11"

Form 4 Insider Transactions: What Each Field Means →

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Cortina Ignacio A

(Last) (First) (Middle)

C/O ALLIANT ENERGY CORPORATION

4902 N. BILTMORE LANE

(Street)

MADISON WISCONSIN 53718

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/10/2026

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

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

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

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	04/10/2026	04/10/2026	A		666.895		(1)	(1)	Deferred Common Stock	666.895	$73.1	10,227.316(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/ Omar N. Chaudhary, Attorney-in-Fact	04/14/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Alliant Energy (LNT) report for Ignacio A. Cortina?

Alliant Energy reported that director Ignacio A. Cortina received 666.895 Deferred Common Stock Units as a grant. These units are a form of deferred equity compensation and increase his total deferred holdings to 10,227.316 units, all reported as directly owned.

At what value were the deferred stock units granted to the Alliant Energy director?

The deferred stock units granted to the Alliant Energy director were valued at $73.10 per unit. This value is used for reporting and compensation purposes and does not necessarily represent a cash transaction in the open market at that price.

How many deferred stock units does Ignacio A. Cortina hold after this Alliant Energy Form 4?

After this transaction, Ignacio A. Cortina holds 10,227.316 Deferred Common Stock Units. This total includes the new 666.895-unit grant plus prior holdings, with adjustments for accrued dividends through an exempt dividend reinvestment mechanism.

When will the Alliant Energy deferred stock units for Ignacio A. Cortina be settled?

The deferred stock units for Ignacio A. Cortina will be settled in shares of Alliant Energy common stock upon the end of his service as a director. Until then, they remain deferred units rather than currently deliverable common shares.

Does the Alliant Energy Form 4 mention dividend adjustments on Cortina’s deferred units?

Yes. The filing notes that Cortina’s total deferred units include adjustments for accrued dividends. These are credited through a dividend reinvestment transaction that is exempt from Section 16 reporting under SEC Rule 16a-11.