Robb Thomas H. 4

What Happened Robb Thomas, Executive Vice President — Manufacturing at Kaiser Aluminum (KALU), was granted 2,954 restricted stock units (RSUs) on March 5, 2026. The grant was reported as an award/acquisition at $0.00 per share (total reported acquisition value $0). The RSUs are subject to restrictions that generally lapse on March 5, 2029 (or earlier if certain specified circumstances occur).

Key Details

• Transaction date: 2026-03-05; Form 4 filed: 2026-03-09 (filed within the SEC two-business-day window).
• Transaction type/code: A — Award/Grant of RSUs.
• Shares/units granted: 2,954 RSUs; reported acquisition price: $0.00; total reported value: $0.
• Shares owned after transaction: not disclosed in this Form 4.
• Footnotes: F1 — Grant under the Kaiser Aluminum 2021 Equity and Incentive Compensation Plan; restrictions lapse March 5, 2029 or earlier upon certain events. F2 — Shares will be acquired pursuant to the RSU grants (i.e., these are restricted stock units).

Context RSUs are compensation awards that typically convert into company shares upon vesting and do not represent an open-market purchase or sale. Such grants are common executive compensation and do not by themselves indicate immediate buying or selling sentiment; the economic value to the insider depends on Kaiser Aluminum's stock price at vesting and any applicable tax withholding.