Kaiser Aluminum director receives stock awards

Kaiser Aluminum Corporation director Glenda J. Minor reported two stock awards.

Rhea-AI Filing Summary

Kaiser Aluminum Corporation director Glenda J. Minor reported two stock awards. On June 4, 2026, she acquired 335 shares of common stock at $178.10 per share as a grant of restricted stock under the company’s 2021 Equity and Incentive Compensation Plan. All restrictions on these restricted shares will lapse on June 4, 2027. She also received 786 shares elected in lieu of her annual cash retainer for board and committee service, with the value based on the average closing price of the stock over the 20 trading days prior to June 4, 2026. Following these awards, she directly holds 4,516 shares of Kaiser Aluminum common stock.

Insider Trade Summary

Grant/Award: 1,121 shares

Grant/Award 2 txns

Insider MINOR GLENDA J

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock, par value $0.01 per share	786	$0.00	$0.00
Grant/Award	Common Stock, par value $0.01 per share	335	$178.10	$60K

Holdings After Transaction: Common Stock, par value $0.01 per share — 4,516 shares (Direct)

Footnotes (3)

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.
2. F2. Stock received by the reporting person under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated, at such person's election in lieu of all or a portion of the reporting person's annual cash retainer for serving as a member of the Board of Directors of Kaiser Aluminum Corporation and chair or a member of one or more committees of the Board of Directors.
3. F3. Equal to the average closing price of the Issuer's common stock as reported by the Nasdaq Stock Market, LLC for the 20 trading days prior to June 4, 2026.

Key Figures

Restricted stock grant: 335 shares Grant reference price: $178.10 per share Shares in lieu of cash retainer: 786 shares +3 more

6 metrics

Restricted stock grant 335 shares Grant of restricted stock on June 4, 2026

Grant reference price $178.10 per share Price for 335-share restricted stock grant

Shares in lieu of cash retainer 786 shares Stock elected instead of annual board and committee cash retainers

Total shares after transactions 4,516 shares Director’s direct holdings following June 4, 2026 awards

Valuation method for retainer shares 20-day average closing price Average closing price before June 4, 2026 used to calculate 786 shares

Restriction lapse date June 4, 2027 Date all restrictions on the 335 restricted shares lapse

Key Terms

restricted stock, Equity and Incentive Compensation Plan, annual cash retainer, average closing price, +1 more

5 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"

annual cash retainer financial

"in lieu of all or a portion of the reporting person's annual cash retainer for serving as a member of the Board of Directors"

average closing price financial

"Equal to the average closing price of the Issuer's common stock as reported by the Nasdaq Stock Market, LLC"

The average closing price is the arithmetic mean of a security’s end-of-day prices over a chosen period, found by adding each day’s closing price and dividing by the number of days. It smooths out daily ups and downs to show a typical market value—like averaging daily temperatures to understand a month’s climate—and helps investors spot trends, judge whether a stock is generally rising or falling, and make clearer buy or sell decisions.

trading days financial

"for the 20 trading days prior to June 4, 2026"

Trading days are the specific days when a stock exchange is open and buying and selling of securities can occur, excluding weekends and exchange-declared holidays. Investors use trading days to measure performance, calculate settlement deadlines and time-sensitive events—think of them as the business hours calendar for markets, where returns, volumes and deadlines are counted only on days the market is operating.

FAQ

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

What insider transactions did Kaiser Aluminum (KALU) director Glenda J. Minor report?

Glenda J. Minor reported two stock awards in Kaiser Aluminum common stock. She received 335 restricted shares as an equity grant and 786 shares in lieu of cash board retainer, both dated June 4, 2026, increasing her direct holdings to 4,516 shares.

Was the Kaiser Aluminum (KALU) Form 4 transaction a stock purchase or a grant?

The Form 4 shows stock grants, not open-market purchases. Director Glenda J. Minor acquired shares through a restricted stock grant and additional shares elected instead of cash board fees, all categorized as grant or award acquisitions rather than market buying.

How many Kaiser Aluminum (KALU) shares does Glenda J. Minor hold after these awards?

After the June 4, 2026 awards, Glenda J. Minor directly holds 4,516 shares of Kaiser Aluminum common stock. This figure reflects her updated ownership position following the restricted stock grant and the stock received in lieu of cash board and committee retainers.

What are the vesting terms of Glenda J. Minor’s restricted stock in Kaiser Aluminum (KALU)?

The restricted stock grant to Glenda J. Minor is subject to restrictions that lapse on June 4, 2027. Until that date, the 335 granted shares are restricted under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated.

How was the value determined for Kaiser Aluminum (KALU) shares received instead of cash fees?

The shares received instead of cash retainers were valued using the average closing price of Kaiser Aluminum’s common stock for the 20 trading days before June 4, 2026. This average price determined how many shares corresponded to the elected board and committee retainers.

What plan governs the stock awards reported in the Kaiser Aluminum (KALU) Form 4?

Both the restricted stock grant and the shares received in lieu of cash retainers were issued under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. This plan provides for equity-based compensation to directors and other eligible participants.

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

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Accepted by SEC EDGAR 06/05/2026 - 05:17 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^*

MINOR GLENDA J

(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)	4,181	D
Common Stock, par value $0.01 per share	06/04/2026		A		335(2)	A	$178.1(3)	4,516	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.

2. Stock received by the reporting person under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated, at such person's election in lieu of all or a portion of the reporting person's annual cash retainer for serving as a member of the Board of Directors of Kaiser Aluminum Corporation and chair or a member of one or more committees of the Board of Directors.

3. Equal to the average closing price of the Issuer's common stock as reported by the Nasdaq Stock Market, LLC for the 20 trading days prior to June 4, 2026.

	/s/ Cherrie I. Tsai, with power of attorney for Glenda J. Minor	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)