Diem Nguyen - 27 Jan 2026 Form 4 Insider Report for SIGA TECHNOLOGIES INC (SIGA)

Role
Chief Executive Officer, Director
Signature
/s/ Diem Nguyen
Issuer symbol
SIGA
Transactions as of
27 Jan 2026
Net transactions value
-$155,523
Form type
4
Filing time
28 Jan 2026, 16:05:10 UTC
Previous filing
18 Jun 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Nguyen Diem Chief Executive Officer, Director C/O SIGA TECHNOLOGIES, INC., 31 EAST 62ND STREET, NEW YORK /s/ Diem Nguyen 28 Jan 2026 0001814338

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction SIGA Common Stock, par value $.0001 per share Options Exercise $0 +55,902 +83% $0.000000 123,555 27 Jan 2026 Direct F1
transaction SIGA Common Stock, par value $.0001 per share Tax liability $155,523 -22,804 -18% $6.82 100,751 27 Jan 2026 Direct F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction SIGA Restricted Stock Units Options Exercise $0 -55,902 -50% $0.000000 55,903 27 Jan 2026 Common Stock, par value $.0001 per share 55,902 Direct F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
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.