Nguyen Diem 4

What Happened

• Nguyen Diem, CEO of SIGA Technologies (SIGA), had one-third of his restricted stock units (RSUs) vest on January 27, 2026. The vesting converted 55,902 RSUs into 55,902 shares (exercise/conversion, code M) at $0.00 exercise price.
• To satisfy tax withholding obligations, the issuer withheld 22,804 shares at the closing price of $6.82 on January 27, 2026 (code F), representing about $155,523. Net shares received by the CEO from this vesting event were 33,098 (55,902 vested − 22,804 withheld).
• This was a routine award/vesting event (not an open-market purchase or sale); the acquisition required no cash outlay (exercise price $0).

Key Details

• Transaction date: 2026-01-27; Form 4 filed: 2026-01-28 (timely).
• Vesting/conversion: 55,902 RSUs → 55,902 shares (code M) at $0.00.
• Tax withholding/sale to issuer: 22,804 shares withheld at $6.82/share → $155,523 (code F).
• Net shares issued to insider: 33,098.
• Footnotes: F1–F3 note these shares are from the one-third vesting of RSUs granted Jan 27, 2024; RSUs convert one-for-one and vest over three years; withholding was done by the issuer to satisfy taxes.
• Shares owned after transaction: not specified in the provided excerpt.

Context

• This was a standard RSU vesting with issuer share-withholding to cover taxes (often called a sell-to-cover), not an open-market sale or discretionary purchase — typically considered routine compensation-related activity rather than an explicit bullish or bearish trade signal.
• Transaction codes: M = exercise/conversion of a derivative (RSU conversion), F = withholding to satisfy tax obligations.