Chu Yu-Waye 4

What Happened

• Chu Yu-Waye, Chief Medical Officer of CytomX Therapeutics (CTMX), sold 21,279 shares on 2026-03-17 at $6.42 per share, generating proceeds of $136,675. The Form 4 lists the transaction as a sale (code S).

Key Details

• Transaction date and price: 2026-03-17, 21,279 shares at $6.42 each.
• Total proceeds: $136,675.
• Shares owned after transaction: filing notes beneficial holdings that include 149,833 RSUs (per footnote F2).
• Footnote: F1 states the shares were sold solely to satisfy tax or other government withholding obligations in connection with RSU vesting.
• Filing: Form filed 2026-03-19 (filed within the normal reporting window in this case).

Context

• This was a tax-withholding sale tied to RSU vesting (routine disposition), not necessarily a discretionary sale signaling a change in insider sentiment. Sales to cover taxes are common following equity awards.