JOHN MALCOLM DONNAN - 05 Mar 2026 Form 4 Insider Report for KAISER ALUMINUM CORP (KALU)

Role
EVP, CAO and GC
Signature
/s/ Cherrie I. Tsai, with power of attorney for John M. Donnan
Issuer symbol
KALU
Transactions as of
05 Mar 2026
Net transactions value
$0
Form type
4
Filing time
09 Mar 2026, 16:30:09 UTC
Previous filing
25 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
DONNAN JOHN MALCOLM EVP, CAO and GC 1550 WEST MCEWEN DRIVE, SUITE 500, FRANKLIN /s/ Cherrie I. Tsai, with power of attorney for John M. Donnan 09 Mar 2026 0001311544

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction KALU Common Stock, par value $0.01 per share Award +3,699 +17% $0.000000* 25,904 05 Mar 2026 Direct F1, F2
transaction KALU Common Stock, par value $0.01 per share Award +11,649 +45% $0.000000* 37,553 05 Mar 2026 Direct F2, F3
transaction KALU Common Stock, par value $0.01 per share Tax liability -3,441 -9.2% $125.84* 34,112 05 Mar 2026 Direct F2, F4
transaction KALU Common Stock, par value $0.01 per share Tax liability -1,669 -4.9% $125.84* 32,443 05 Mar 2026 Direct F5, F6
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Grant to the reporting person effective as of March 5, 2026 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on March 5, 2029 or earlier upon the occurrence of certain specified circumstances.
F2 Includes 21,661 shares acquired pursuant to grants of restricted stock units.
F3 Shares earned upon the vesting on March 5, 2026 of certain performance shares granted to the reporting person in 2023 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan. On March 5, 2026, the Registrant's compensation committee certified the performance shares payout multiplier based on the level of achievement by the Registrant of certain pre-established performance goals for 2023 through 2025.
F4 Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2026 of the above-referenced performance shares.
F5 Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2026 of certain restricted stock units granted to the reporting person in 2023 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan.
F6 Includes 17,422 shares acquired pursuant to grants of restricted stock units.