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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
811596	Kaiser Aluminum Corp	KALU	Rolling Drawing & Extruding Of Nonferrous Metals (3350)	943030279

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1213324	Jr E Alfred Osborne	C/O Kaiser Aluminum Corp. 27422 Portola Parkway Suite 200 Foothill Ranch CA 92610		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock, Par Value $0.01 Per Share	Disposition	2021-06-02	2,500	$132.95	17,420	No	4	S	Direct
Common Stock, Par Value $0.01 Per Share	Acquisiton	2021-06-03	952	$0.00	18,372	No	4	A	Direct
Common Stock, Par Value $0.01 Per Share	Acquisiton	2021-06-03	724	$131.21	19,096	No	4	A	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	S	Direct
No	4	A	Direct
No	4	A	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock, Par Value $0.01 Per Share	3,500	Indirect	By Keogh Plan
Common Stock, Par Value $0.01 Per Share	500	Indirect	By the Rahnasto/Osborne Revocable Trust U/A DTD 11/07/1999

Footnotes

Represents the sale of 2,500 shares in multiple transactions, ranging from $132.820 to $133.030 per share, resulting in a weighted average sale price of $132.945 per share. The reporting person undertakes 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.
Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan. All restrictions will lapse on June 3, 2022.
Stock received by the reporting person under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan 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, lead independent director or chair of a committee of the Board of Directors.
Equal to the average of the closing prices of the Issuer's common stock as reported by the Nasdaq Stock Market, LLC for the twenty trading days prior to June 3, 2021.