Kaiser Aluminum director granted 786 restricted shares

Glas Kimberly Thompson reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Glas Kimberly Thompson reported acquisition or exercise transactions in this Form 4 filing.

Kaiser Aluminum Corp director Kimberly Thompson Glas received a grant of 786 shares of restricted common stock as equity compensation. The award was made at no cash cost to her and comes under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan.

All restrictions on these shares are scheduled to lapse on June 4, 2027, at which point the stock should fully vest if plan conditions are met. Following this grant, Glas directly holds a total of 3,466 shares of Kaiser Aluminum common stock, reflecting her ongoing equity stake in the company.

Insider Trade Summary

Grant/Award: 786 shares

Grant/Award 1 txn

Insider Glas Kimberly Thompson

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 — 3,466 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 per share: $0.00 per share Total holdings after grant: 3,466 shares +1 more

4 metrics

Restricted stock grant 786 shares Common Stock granted to director on June 4, 2026

Grant price per share $0.00 per share Equity compensation award, not open-market purchase

Total holdings after grant 3,466 shares Director’s direct ownership following the transaction

Restriction lapse date June 4, 2027 All restrictions on granted restricted stock lapse

Key Terms

restricted stock, Equity and Incentive Compensation Plan, Form 4

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"

Form 4 regulatory

"INSIDER FILING DATA (Form 4)"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

FAQ

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

What did Kaiser Aluminum (KALU) director Kimberly Thompson Glas report on this Form 4?

Kimberly Thompson Glas reported receiving 786 shares of restricted common stock as an equity grant. The award was made at no cash cost and increases her direct holdings to 3,466 Kaiser Aluminum shares, aligning her compensation more closely with shareholder interests.

How many Kaiser Aluminum (KALU) shares were granted to the director and at what price?

The director was granted 786 shares of Kaiser Aluminum common stock at a reported price of $0.00 per share. This indicates a compensation-related stock award, rather than an open-market purchase, under the company’s 2021 Equity and Incentive Compensation Plan.

When do the restrictions on the new Kaiser Aluminum (KALU) restricted stock grant lapse?

All restrictions on the 786 shares of restricted stock are scheduled to lapse on June 4, 2027. At that time, assuming plan conditions are satisfied, the award should fully vest, giving the director unrestricted ownership of those shares.

What are Kimberly Thompson Glas’s holdings in Kaiser Aluminum (KALU) after this grant?

After receiving the 786-share restricted stock grant, Kimberly Thompson Glas directly holds 3,466 shares of Kaiser Aluminum common stock. This total includes the newly granted restricted shares, increasing her overall equity exposure to the company as a director.

Is the Kaiser Aluminum (KALU) Form 4 transaction a market purchase or a compensation award?

The Form 4 reflects a compensation-related award, not a market purchase. The 786 shares of restricted stock were granted at $0.00 per share under the 2021 Equity and Incentive Compensation Plan, indicating an equity incentive rather than a cash-funded stock buy.

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

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Accepted by SEC EDGAR 06/05/2026 - 06:11 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^*

Glas Kimberly Thompson

(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)	3,466	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 Kimberly T. Glas	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)