Kaiser Aluminum director granted 786 restricted shares

Foster David A reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Foster David A reported acquisition or exercise transactions in this Form 4 filing.

Kaiser Aluminum Corporation director David A. Foster received a grant of 786 shares of restricted common stock as equity compensation. The award was granted under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated, at no cash cost to him.

All restrictions on these 786 restricted shares are scheduled to lapse on June 4, 2027, after which the shares should become fully vested if conditions are met. Following this grant, Foster directly holds a total of 24,332 shares of Kaiser Aluminum common stock.

Insider Trade Summary

Grant/Award: 786 shares

Grant/Award 1 txn

Insider Foster David A

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 — 24,332 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 grant: 786 shares Grant price: $0.00 per share Post-transaction holdings: 24,332 shares +1 more

4 metrics

Restricted stock grant 786 shares Grant of restricted common stock to director on June 4, 2026

Grant price $0.00 per share Equity compensation, no cash paid for restricted stock

Post-transaction holdings 24,332 shares Total common shares directly held after grant

Vesting date June 4, 2027 All restrictions on the 786 restricted shares lapse on this date

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 insider transaction did Kaiser Aluminum (KALU) report for David A. Foster?

Kaiser Aluminum reported that director David A. Foster received a grant of 786 restricted shares of common stock. The award was issued as equity compensation under the company’s 2021 Equity and Incentive Compensation Plan, increasing his direct holdings to 24,332 shares.

How many Kaiser Aluminum (KALU) shares does David A. Foster hold after this Form 4?

After the reported grant, David A. Foster directly holds 24,332 shares of Kaiser Aluminum common stock. This total includes the newly granted 786 restricted shares, which are subject to vesting conditions until June 4, 2027, under the company’s equity incentive plan.

What type of shares did David A. Foster receive from Kaiser Aluminum (KALU)?

David A. Foster received 786 shares of restricted common stock in Kaiser Aluminum. These restricted shares were granted as compensation under the 2021 Equity and Incentive Compensation Plan and carry vesting restrictions that are scheduled to lapse on June 4, 2027.

When do the restrictions on David A. Foster’s Kaiser Aluminum (KALU) restricted stock lapse?

All restrictions on the 786 restricted shares granted to David A. Foster will lapse on June 4, 2027. At that time, assuming conditions are satisfied, the shares are expected to become fully vested, turning into unrestricted common stock holdings.

Was cash paid for the restricted stock granted to David A. Foster at Kaiser Aluminum (KALU)?

No cash was paid for this grant; the 786 restricted shares were awarded at a price of $0.00 per share. The grant represents non-cash equity compensation provided under Kaiser Aluminum’s 2021 Equity and Incentive Compensation Plan, as amended and restated.

Is the June 4, 2026 Form 4 for Kaiser Aluminum (KALU) a purchase or a grant?

The Form 4 reflects a grant or award acquisition, not an open-market purchase. David A. Foster received 786 restricted shares as a compensation grant coded “A,” increasing his direct holdings but involving no open-market buying or selling activity.

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

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Accepted by SEC EDGAR 06/05/2026 - 05:15 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^*

Foster David A

(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)	24,332	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/ Cherrie I. Tsai, with power of attorney for David A. Foster	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)