CALLAHAN MICHAEL JOHN 4

What Happened Michael John Callahan, Rivian’s Chief Administrative Officer, was granted equity awards on March 20, 2026: 264,201 restricted stock units (RSUs) and a derivative award representing 528,402 underlying shares (reported at $0.00, i.e., awarded rather than purchased). Combined, the awards cover up to 792,603 potential shares of Rivian Class A common stock. These were grants/awards — not open-market purchases or sales — and do not produce immediate proceeds.

Key Details

• Transaction date: March 20, 2026; Form 4 filed March 24, 2026 (appears timely within the SEC’s 2-business-day reporting window).
• Award amounts and price: 264,201 RSUs @ $0.00; 528,402-share derivative award @ $0.00.
• Vesting/conditions: RSUs vest quarterly over the next 16 quarters after Feb 15, 2026 (footnote F1). The derivative (stock option) vests 25% annually over the next four anniversaries beginning March 20, 2026 (footnote F2).
• Shares owned after the transaction: not specified in the provided filing.
• Transaction code: A = Award/Grant. No 10b5-1 plan, tax-withholding sale, or sale reported in this filing.

Context These awards are standard executive compensation grants that create a contingent right to receive shares over multi-year vesting schedules. The RSUs convert to shares as they vest; the derivative award is a stock-option-style grant that vests over four years and would require exercise (and possibly payment of an exercise price) before shares are delivered. Because these are grants, they do not reflect an immediate buying or selling decision by the insider.