Dennis E. Hruby - 13 Mar 2026 Form 4 Insider Report for SIGA TECHNOLOGIES INC (SIGA)

Reporting relationship: EVP & Chief Scientific Officer
Issuer ticker: SIGA
Reported as of: 13 Mar 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 17 Mar 2026, 16:09:22 UTC
Prior SEC filing: 02 Jul 2025
Source filing: View source filing
Reporting owner signature: /s/ Larry R. Miller, as Attorney-in-Fact

Key filing fact

Dennis E. Hruby filed Form 4 for SIGA TECHNOLOGIES INC (SIGA) on 17 Mar 2026.

Key facts

This page summarizes Dennis E. Hruby's Form 4 filing for SIGA TECHNOLOGIES INC (SIGA).
4 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 17 Mar 2026, 16:09.

Change

Previous filing in this sequence was filed on 02 Jul 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001301548 Primary reporting owner

Hruby Dennis E

Relationship: EVP & Chief Scientific Officer
Address: C/O SIGA TECHNOLOGIES, INC., 31 EAST 62ND STREET, NEW YORK
Signature: /s/ Larry R. Miller, as Attorney-in-Fact
Signature date: 17 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

SIGA transaction

Common Stock, par value $.0001 per share

Options Exercise

Transaction value
Shares: +11,445
Change %: +6%
Price: $0.000000^*
Shares after: 202,492
Date: 13 Mar 2026
Ownership: Direct
Footnotes: F1

SIGA transaction

Common Stock, par value $.0001 per share

Tax liability

Transaction value
Shares: -3,955
Change %: -2%
Price: $5.26^*
Shares after: 198,537
Date: 13 Mar 2026
Ownership: Direct
Footnotes: F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

SIGA transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -11,445
Change %: -33%
Price: $0.000000^*
Shares after: 22,891
Date: 13 Mar 2026
Ownership: Direct
Underlying class: Common Stock, par value $.0001 per share
Underlying amount: 11,445
Exercise price
Footnotes: F3

SIGA transaction Derivative

Restricted Stock Units

Award

Transaction value
Shares: +54,942
Change %
Price: $0.000000^*
Shares after: 54,942
Date: 13 Mar 2026
Ownership: Direct
Underlying class: Common Stock, par value $.0001 per share
Underlying amount: 54,942
Exercise price
Footnotes: F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

Represents the acquisition of Common Stock from the vesting of one-third of the restricted stock units ("RSUs") granted on March 13, 2025.

Footnote 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.

Footnote 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.