Alliant Energy director granted deferred stock units

Cortina Ignacio A reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Cortina Ignacio A reported acquisition or exercise transactions in this Form 4 filing.

ALLIANT ENERGY CORP director Ignacio A. Cortina received a grant of 638.089 Deferred Common Stock Units, referenced at $76.40 per unit. Following this award, Cortina holds 10,942.579 Deferred Common Stock Units directly. These units are to be settled in shares of common stock upon his termination of service as a director and include adjustments for accrued dividends through a dividend reinvestment transaction exempt from Section 16 under Rule 16a-11.

Insider Trade Summary

Grant/Award: 638.089 shares

Grant/Award 1 txn

Insider Cortina Ignacio A

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Deferred Common Stock Units F1, F2	638.089	$76.40	$49K

Holdings After Transaction: Deferred Common Stock Units — 10,942.579 contracts (Direct)

Footnotes (2)

1. F1. Units are to be settled in shares of common stock upon the reporting person's termination of services as a director.
2. F2. Includes adjustments for accrued dividends, pursuant to a dividend reinvestment transaction exempt from Section 16 under Rule 16a-11.

Key Figures

Deferred Common Stock Units granted: 638.089 units Transaction price per unit: $76.4000 Total Deferred Common Stock Units after grant: 10,942.579 units +1 more

4 metrics

Deferred Common Stock Units granted 638.089 units Grant of Deferred Common Stock Units to director Ignacio A. Cortina on 2026-07-10

Transaction price per unit $76.4000 Recorded transaction price per Deferred Common Stock Unit for the 638.089-unit grant

Total Deferred Common Stock Units after grant 10,942.579 units Cortina’s direct holdings of Deferred Common Stock Units following the reported award

Conversion or exercise price 0.0000 Deferred Common Stock Units to be settled in common stock without additional exercise price

Key Terms

Deferred Common Stock Units, dividend reinvestment transaction, Rule 16a-11

3 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.

dividend reinvestment transaction financial

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

A dividend reinvestment transaction is when an investor uses cash dividends paid by a company to automatically buy more of that company's shares instead of taking the money as cash. Like choosing to roll interest back into a savings account, it increases your share count over time and can speed up growth through compounding, so investors care because it changes ownership stake, long‑term returns, and sometimes tax or record‑keeping implications.

Rule 16a-11 regulatory

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

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did ALLIANT ENERGY CORP (LNT) report for Ignacio A. Cortina?

ALLIANT ENERGY CORP reported that director Ignacio A. Cortina received a grant of 638.089 Deferred Common Stock Units. The award is referenced at $76.40 per unit and increases his direct holdings of deferred units to 10,942.579.

How many Deferred Common Stock Units does Ignacio A. Cortina now hold at ALLIANT ENERGY CORP (LNT)?

After the reported grant, Ignacio A. Cortina holds 10,942.579 Deferred Common Stock Units directly. This total includes the new 638.089-unit grant and prior accumulated units, plus adjustments for accrued dividends via dividend reinvestment.

At what price were the new Deferred Common Stock Units for LNT’s director Cortina recorded?

The newly granted 638.089 Deferred Common Stock Units for Ignacio A. Cortina are recorded at $76.40 per unit. This figure reflects the transaction price per unit associated with the grant disclosed for ALLIANT ENERGY CORP.

When will Ignacio A. Cortina’s Deferred Common Stock Units at ALLIANT ENERGY CORP (LNT) be settled?

Cortina’s Deferred Common Stock Units are to be settled in shares of common stock upon his termination of services as a director. Settlement occurs only at that time, rather than immediately when the units are granted.

How are dividends handled for Ignacio A. Cortina’s Deferred Common Stock Units at LNT?

The total for Cortina’s Deferred Common Stock Units includes adjustments for accrued dividends. These arise from a dividend reinvestment transaction that is exempt from Section 16 reporting under Rule 16a-11, effectively reinvesting dividends into additional units.

Is the reported transaction for Ignacio A. Cortina at ALLIANT ENERGY CORP (LNT) a market buy or a compensation grant?

The transaction is a grant/award acquisition of Deferred Common Stock Units, coded as “A” for a grant or award. It is part of director compensation rather than an open-market purchase or sale of ALLIANT ENERGY CORP common stock.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 07/14/2026 - 10:35 AM Learn about SEC filing dates

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)
07/10/2026

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	07/10/2026	07/10/2026	A		638.089		(1)	(1)	Deferred Common Stock	638.089	$76.4	10,942.579(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	07/14/2026
	** 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)