Miller Larry R. 4

What Happened

• Larry R. Miller, General Counsel of SIGA Technologies (SIGA), reported the vesting/acquisition of 68,060 shares from restricted stock units (RSUs) on March 13, 2026. The issuer withheld 11,187 shares to satisfy tax withholding obligations (based on the $5.26 closing price), valued at $58,844.
• The filing also reports conversion/exercise of 21,261 derivative shares (reported as exercised/converted and cancelled) at $0 — these appear as non‑cash derivative conversions associated with the equity award.

Key Details

• Transaction date: March 13, 2026; Form 4 filed March 17, 2026 (appears timely).
• Vesting: 68,060 RSU shares acquired (represents one‑third of RSUs granted March 13, 2025; RSUs vest one‑third annually).
• Tax withholding: 11,187 shares withheld at $5.26/share = $58,844 (code F).
• Derivatives: 21,261 derivative shares shown exercised/converted and cancelled at $0 — reported as M entries (no cash proceeds).
• Shares owned after transaction: Not provided in the supplied data.

Context

• This was an award/vesting transaction (A) with tax withholding (F), not an open‑market buy or sale; such vesting is routine compensation, not a market directional trade.
• The derivative (M) entries reflect conversions/cancellations of underlying derivative securities tied to the award and involved no cash exchange; the net common shares received after withholding appear to be 68,060 − 11,187 = 56,873 shares.