Hruby Dennis E 4

4 · SIGA TECHNOLOGIES INC · Filed Mar 17, 2026

AI-generated summary of this filing

Updated Mar 17, 2026

SIGA EVP Dennis Hruby Receives RSUs; Shares Withheld for Taxes

What Happened

Dennis E. Hruby, EVP & Chief Scientific Officer of SIGA Technologies (SIGA), had restricted stock units (RSUs) vest on March 13, 2026. The filing shows a grant/award conversion of 54,942 RSUs into common stock (reported at $0.00). To satisfy tax withholding on the vesting, the issuer withheld 3,955 shares at the closing price of $5.26, a withholding value of $20,803.
The filing also reports derivative-related entries (coded "M") at $0.00, which reflect the conversion/exercise of derivative awards into shares in connection with the vesting. This was not a cash purchase or open-market sale — it was an issuance from vested RSUs (a routine, non-speculative compensation event).

Key Details

Transaction date: March 13, 2026; Form 4 filed March 17, 2026 (timely).
Shares acquired from vesting: 54,942 RSUs converted to common stock (reported $0.00).
Shares withheld for taxes: 3,955 shares at $5.26/share = $20,803 (cashless withholding by issuer).
Transaction codes: A = Award/Grant (RSU vesting); M = exercise/conversion of derivative; F = tax withholding.
Post-transaction holdings: Not specified in the provided filing excerpt.
Footnotes: (1) One-third of RSUs granted on March 13, 2025 vested; (2) Withholding based on $5.26 closing price; (3) RSUs vest one-third each year over three years.

Context

This is a standard equity compensation vesting and tax-withholding event, not an open-market buy or sale. Withholding of shares to cover taxes (cashless) is routine and does not necessarily indicate a change in insider sentiment.

Form 4

Period: 2026-03-13

EVP & Chief Scientific Officer

Transactions

Exercise/Conversion
Common Stock, par value $.0001 per share
[F1]
2026-03-13+11,445→ 202,492 total
Tax Payment
Common Stock, par value $.0001 per share
[F2]
2026-03-13$5.26/sh−3,955$20,803→ 198,537 total
Exercise/Conversion
Restricted Stock Units
[F3]
2026-03-13−11,445→ 22,891 total
→ Common Stock, par value $.0001 per share (11,445 underlying)
Award
Restricted Stock Units
[F3]
2026-03-13+54,942→ 54,942 total
→ Common Stock, par value $.0001 per share (54,942 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, as Attorney-in-Fact|2026-03-17

1 file