arnold michael c 4

What Happened

• Michael C. Arnold, a director of Kaiser Aluminum Corporation (KALU), received a grant of 786 restricted shares on June 4, 2026. The shares were awarded at $0.00 (total reported value $0) as an equity award rather than an open-market purchase or sale. The award is restricted stock under the company’s 2021 Equity and Incentive Compensation Plan; all restrictions lapse on June 4, 2027.

Key Details

• Transaction date and type: 2026-06-04 — Award/Grant (code A)
• Price: $0.00 per share; reported total $0
• Shares received: 786 restricted shares
• Post-transaction holdings: Not specified in the provided filing excerpt
• Footnote: Grant made under Kaiser Aluminum’s 2021 Equity and Incentive Compensation Plan; restrictions lapse 06/04/2027 (Footnote F1)
• Filing timeliness: Report filed 2026-06-05 covering the 06/04/2026 transaction — appears timely (Form 4 required within two business days)

Context

• This was a restricted stock award (compensation), not an open-market purchase or sale. Restricted shares are subject to vesting or other transfer restrictions until the lapse date noted; the recipient does not pay cash for the grant. Such awards are commonly used for director and executive compensation and do not, by themselves, indicate the insider is buying or selling shares in the market.