Kaiser Aluminum CEO sells 3,031 company shares

Kaiser Aluminum Corp President & CEO Harvey Keith reported an open-market sale of the company’s common stock.

Rhea-AI Filing Summary

Kaiser Aluminum Corp President & CEO Harvey Keith reported an open-market sale of the company’s common stock. On April 29, 2026, he sold 3,031 shares of Kaiser Aluminum common stock at a weighted average price of $173.13 per share, in multiple trades between $173.00 and $173.80.

After this transaction, Keith directly holds 94,308 shares of Kaiser Aluminum common stock, which the footnotes state include 72,565 shares acquired through grants of restricted stock units. This filing reflects a relatively small sale compared with his remaining direct holdings.

Insider Trade Summary

Net Seller: 3,031 shares

Net Sell 1 txn

Insider Harvey Keith

Role President & CEO

Sold 3,031 shs ($525K)

Type	Security	Shares	Price	Value
Sale	Common Stock, par value $0.01 per share	3,031	$173.13	$525K

Holdings After Transaction: Common Stock, par value $0.01 per share — 94,308 shares (Direct)

Footnotes (2)

1. F1. Represents the sale of 3,031 shares in multiple transactions, ranging from $173.00 to $173.80 per share, resulting in a weighted average sale price of $173.13 per share. The reporting person undertake to provide upon request by the SEC staff, the Registrant, or a security holder of the Registrant, full information regarding the number of shares sold at each separate price within the range.
2. F2. Includes 72,565 shares acquired pursuant to grants of restricted stock units.

Key Figures

Shares sold: 3,031 shares Weighted average sale price: $173.13 per share Shares held after transaction: 94,308 shares +1 more

4 metrics

Shares sold 3,031 shares Common stock sold on April 29, 2026

Weighted average sale price $173.13 per share Price for 3,031 shares sold in multiple trades

Shares held after transaction 94,308 shares Direct Kaiser Aluminum holdings following the sale

RSU-acquired shares 72,565 shares Portion of direct holdings from restricted stock unit grants

Key Terms

weighted average sale price, restricted stock units, open-market sale

3 terms

weighted average sale price financial

"resulting in a weighted average sale price of $173.13 per share"

restricted stock units financial

"Includes 72,565 shares acquired pursuant to grants of restricted stock units."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

FAQ

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

What insider transaction did Kaiser Aluminum (KALU) report for CEO Harvey Keith?

Kaiser Aluminum reported that President & CEO Harvey Keith sold 3,031 shares of common stock. The sale occurred on April 29, 2026, as an open-market transaction at a weighted average price of $173.13 per share, executed across multiple trades between $173.00 and $173.80.

At what prices did Harvey Keith sell Kaiser Aluminum (KALU) shares?

Harvey Keith’s sale was executed in multiple trades ranging from $173.00 to $173.80 per Kaiser Aluminum share. The transactions produced a weighted average sale price of $173.13 per share, according to the footnote accompanying the Form 4 insider trading disclosure.

How many Kaiser Aluminum (KALU) shares does CEO Harvey Keith hold after the sale?

After the reported sale, Harvey Keith directly holds 94,308 Kaiser Aluminum common shares. A footnote specifies that this total includes 72,565 shares acquired through grants of restricted stock units, highlighting that most of his position comes from equity-based compensation awards.

What portion of Harvey Keith’s Kaiser Aluminum (KALU) holdings came from restricted stock units?

The filing notes that 72,565 of Harvey Keith’s 94,308 directly held Kaiser Aluminum shares were acquired through restricted stock unit grants. This indicates a substantial part of his stake reflects long-term equity compensation rather than open-market share purchases.

Was Harvey Keith’s Kaiser Aluminum (KALU) transaction an open-market sale?

Yes. The Form 4 classifies the transaction with code “S,” described as an open-market or private sale. The details specify that 3,031 Kaiser Aluminum common shares were sold in multiple market transactions, with a disclosed weighted average sale price of $173.13 per share.

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

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Accepted by SEC EDGAR 05/01/2026 - 04:30 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^*

Harvey Keith

(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
X	Officer (give title below)		Other (specify below)
	President & CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/29/2026

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	04/29/2026		S		3,031	D	$173.13(1)	94,308(2)	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. Represents the sale of 3,031 shares in multiple transactions, ranging from $173.00 to $173.80 per share, resulting in a weighted average sale price of $173.13 per share. The reporting person undertake to provide upon request by the SEC staff, the Registrant, or a security holder of the Registrant, full information regarding the number of shares sold at each separate price within the range.

2. Includes 72,565 shares acquired pursuant to grants of restricted stock units.

	/s/ Cherrie I. Tsai, with power of attorney for Keith Harvey	05/01/2026
	** 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)