Rivian Chief Admin Officer Michael Callahan Withholds 42,082 Shares

What Happened Michael John Callahan, Rivian's Chief Administrative Officer, had 42,082 shares of Class A common stock withheld by the company on August 15, 2026 to satisfy tax withholding obligations tied to the vesting of restricted stock units. The withholding was recorded at $15.36 per share, for a total value of approximately $646,380. This was a tax-withholding disposition related to RSU vesting, not an open-market sale or purchase.

Key Details

• Transaction date: August 15, 2026; Filing date: August 18, 2026 (Form 4 accession 0001262742-26-000012).
• Price used: $15.36 per share (closing price on August 14, 2026).
• Shares withheld/ disposed: 42,082 shares; reported total value ≈ $646,380.
• Related award: Withholding satisfied taxes on 82,704 RSUs that vested the same day (footnote F1).
• Transaction code: F (Payment of exercise price or tax liability — tax withholding).
• Shares owned after transaction: Not specified in the provided filing excerpt.
• Filing timeliness: Filed three calendar days after the transaction (appears timely under the Form 4 two-business-day rule).

Context This transaction represents a routine net settlement/tax withholding at vesting of RSUs (company withheld shares to cover taxes). Such withholdings are administrative and do not necessarily indicate insider sentiment about the company's stock.