Miller Larry R. 4

4 · SIGA TECHNOLOGIES INC · Filed Mar 17, 2026

AI-generated summary of this filing

Updated Mar 17, 2026

SIGA GC Larry Miller Receives RSU Award Shares

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.

Form 4

Period: 2026-03-13

General Counsel

Transactions

Exercise/Conversion
Common Stock, par value $.0001 per share
[F1]
2026-03-13+21,261→ 59,705 total
Tax Payment
Common Stock, par value $.0001 per share
[F2]
2026-03-13$5.26/sh−11,187$58,844→ 48,518 total
Exercise/Conversion
Restricted Stock Units
[F3]
2026-03-13−21,261→ 42,523 total
→ Common Stock, par value $.0001 per share (21,261 underlying)
Award
Restricted Stock Units
[F3]
2026-03-13+68,060→ 68,060 total
→ Common Stock, par value $.0001 per share (68,060 underlying)

Footnotes (3)

[F1]Represents the acquisition of Common Stock from the vesting of one-third of the restricted stock units ("RSUs") granted on March 13, 2025.
[F2]Represents the withholding by the Issuer of shares of Common Stock (based on $5.26 per share, the closing stock price on March 13, 2026) to satisfy tax withholding obligations associated with the vesting of RSUs and the consequent issuance of Common Stock.
[F3]RSUs represent contingent rights to receive Common Stock on a one-for-one basis. The RSUs vest over three years, one-third on each of the first three anniversaries of the date of grant.

Signature

/s/ Larry R. Miller|2026-03-17

1 file