Nguyen Diem 4

What Happened

• Nguyen Diem, CEO of SIGA Technologies (SIGA), had restricted stock units (RSUs) vest and convert into common stock on March 13, 2026. The filing shows 85,045 derivative shares converted (exercise/conversion) and a related withholding of 47,029 shares at $5.26 per share to satisfy tax obligations (withheld value $247,373). The report also records a derivative award entry of 272,243 RSUs (see footnotes).
• This was not an open‑market sale by the CEO but a routine vesting event with shares withheld to cover taxes.

Key Details

• Transaction date: March 13, 2026; Form 4 filed March 17, 2026 (timely).
• Withholding price: $5.26 per share (closing price on 3/13/2026); tax withholding amount = $247,373 for 47,029 shares.
• Reported derivative activity: 85,045 shares converted (M code) and 272,243 RSUs recorded as an award (A code).
• Shares owned after transaction: Not specified in the provided excerpt of the filing.
• Footnotes:
  • F1: The acquired common stock resulted from the vesting of one‑third of RSUs granted on March 13, 2025.
  • F2: The issuer withheld shares to satisfy tax withholding obligations, calculated at $5.26/share.
  • F3: RSUs vest one‑third on each of the first three anniversaries of the grant date.
• Filing timeliness: Filed within the required reporting window (timely).

Context

• RSUs convert to common stock on vesting; the withholding of shares to cover taxes is a common, administrative step and not the same as an open‑market sale. The filing shows a net increase in owned shares for the insider after withholding (conversion minus shares withheld), though exact post‑transaction holdings are not disclosed here.
• These entries reflect equity compensation vesting and tax coverage, not discretionary purchases or market sales by the CEO.