West Neal E 4

4 · KAISER ALUMINUM CORP · Filed Mar 9, 2026

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Updated Mar 9, 2026

Kaiser Aluminum CFO West Neal Receives RSUs; Tax-Withheld Shares

What Happened

West Neal E, EVP & Chief Financial Officer of Kaiser Aluminum (KALU), received equity awards and had performance shares vest on March 5, 2026. The filing shows two award entries (3,905 and 12,296 shares) reported as acquisitions at $0.00 (awarded/vested).
To satisfy tax withholding on the vesting, 3,694 shares and 1,761 shares were withheld (reported as dispositions) at a per-share value of $125.84, resulting in a total withholding value of $464,853 and $221,604 respectively (combined ≈ $686,457). These were tax-withholding transactions, not open-market sales.

Key Details

Transaction date: March 5, 2026; Form 4 filed March 9, 2026 (filed within the required 2 business days).
Reported award lines: 3,905 shares and 12,296 shares acquired (price reported $0.00).
Shares withheld for taxes (dispositions): 3,694 and 1,761 shares at $125.84/share (total withheld = 5,455 shares; total value ≈ $686,457).
Footnotes: awards are restricted stock units (RSUs) under the company’s 2021 Equity and Incentive Compensation Plan; restrictions on the new RSUs generally lapse March 5, 2029. The filing also notes the March 5, 2026 vesting of performance shares granted in 2023, with the compensation committee certifying the payout multiplier.
Transaction codes: A = Award/Grant; F = shares withheld to satisfy tax liabilities.
Shares owned after the transactions are not specified in the information provided in your prompt.

Context

These entries represent equity compensation and tax withholding on vested awards, not a discretionary open‑market sale. Withholding of shares to cover taxes is a routine administrative step and does not by itself indicate a change in the insider’s market view.
For retail investors, purchases/holdings can be more informative than routine award vesting; this filing mainly documents compensation-related activity and tax withholding.

Form 4

Period: 2026-03-05

EVP & CFO

Transactions

Award
Common Stock, par value $0.01 per share
[F1][F2]
2026-03-05+3,905→ 22,865 total
Award
Common Stock, par value $0.01 per share
[F3][F2]
2026-03-05+12,296→ 35,161 total
Tax Payment
Common Stock, par value $0.01 per share
[F4][F2]
2026-03-05$125.84/sh−3,694$464,853→ 31,467 total
Tax Payment
Common Stock, par value $0.01 per share
[F5][F6]
2026-03-05$125.84/sh−1,761$221,604→ 29,706 total

Holdings

Footnotes (6)

[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 uponthe occurrence of certain specified circumstances.
[F2]Includes 22,865 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 18,390 shares acquired pursuant to grants of restricted stock units.

Signature

/s/ Cherrie I. Tsai, with power of attorney for Neal E. West|2026-03-05

1 file