SIGA TECHNOLOGIES INC — Director's Dealing 2026

Jan 28, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: SIGA TECHNOLOGIES INC (SIGA)
CIK: 0001010086
Period of Report: 2026-01-27

Reporting Person: Nguyen Diem (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-01-27	Common Stock, par value $.0001 per share	M	55902	—	Acquired	123555	Direct
2026-01-27	Common Stock, par value $.0001 per share	F	22804	$6.82	Disposed	100751	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-01-27	Restricted Stock Units	$	M	55902	Disposed		Common Stock, par value $.0001 per share (55902)	Direct

Footnotes

F1: Represents the acquisition of Common Stock from the vesting of one-third of the restricted stock units ("RSUs") granted on January 27, 2024.

F2: Represents the withholding by the Issuer of shares of Common Stock (based on $6.82 per share, the closing stock price on January 27, 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.