Kaiser Aluminum director granted 786 restricted shares

Grimley Richard P. reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Grimley Richard P. reported acquisition or exercise transactions in this Form 4 filing.

Kaiser Aluminum Corp director Richard P. Grimley received a grant of 786 shares of common stock as equity compensation. The shares were awarded at no cash cost to him under the company’s 2021 Equity and Incentive Compensation Plan. After this grant, he directly holds 5,364 shares of Kaiser Aluminum common stock. All restrictions on the newly granted restricted stock are scheduled to lapse on June 4, 2027, turning them into fully vested shares if conditions are met.

Insider Trade Summary

Grant/Award: 786 shares

Grant/Award 1 txn

Insider Grimley Richard P.

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock, par value $0.01 per share	786	$0.00	$0.00

Holdings After Transaction: Common Stock, par value $0.01 per share — 5,364 shares (Direct)

Footnotes (1)

1. F1. Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.

Key Figures

Restricted stock granted: 786 shares Grant price per share: $0.0000 per share Shares held after grant: 5,364 shares +2 more

5 metrics

Restricted stock granted 786 shares Grant of common stock on June 4, 2026

Grant price per share $0.0000 per share Equity award, non-cash compensation

Shares held after grant 5,364 shares Total direct holdings following transaction

Restriction lapse date June 4, 2027 Vesting date for granted restricted stock

Transaction code A Grant, award, or other acquisition

Key Terms

restricted stock, Equity and Incentive Compensation Plan, grant, award, or other acquisition

3 terms

restricted stock financial

"Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

Equity and Incentive Compensation Plan financial

"under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated"

grant, award, or other acquisition financial

"transaction_code_description": "Grant, award, or other acquisition"

FAQ

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

What did Richard P. Grimley acquire in this Form 4 for KALU?

Richard P. Grimley received a grant of 786 shares of Kaiser Aluminum common stock. The shares are restricted stock awarded as equity compensation under the 2021 Equity and Incentive Compensation Plan.

Was the KALU Form 4 transaction a market buy or sale?

The Form 4 shows an acquisition through a grant, not a market trade. Grimley received 786 restricted shares at no cash price as compensation rather than buying or selling shares in the open market.

How many Kaiser Aluminum (KALU) shares does Grimley hold after this grant?

After the restricted stock grant, Grimley directly holds 5,364 shares of Kaiser Aluminum common stock. This figure includes the newly granted 786 shares, which remain subject to vesting restrictions until June 4, 2027.

When do the restrictions on Grimley’s new KALU shares lapse?

All restrictions on the 786 restricted shares will lapse on June 4, 2027. At that time, assuming conditions are satisfied, the shares become fully vested and function like ordinary, unrestricted Kaiser Aluminum common stock.

Under which plan was the KALU restricted stock granted to Grimley?

The restricted stock was granted under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. This plan provides equity-based awards to align director and employee interests with shareholders.

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

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Accepted by SEC EDGAR 06/05/2026 - 05:46 PM 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^*

Grimley Richard P.

(Last) (First) (Middle)

1550 WEST MCEWEN DRIVE, SUITE 500

(Street)

FRANKLIN TENNESSEE 37067

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
KAISER ALUMINUM CORP [ KALU ]

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)
06/04/2026

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
Common Stock, par value $0.01 per share	06/04/2026		A		786(1)	A	$0(1)	5,364	D

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

Explanation of Responses:

1. Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.

	/s/ John M. Donnan, with power of attorney for Richard P. Grimley	06/05/2026
	** 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)