SIGA TECHNOLOGIES INC 4

SIGA Technologies CEO Diem Nguyen acquired 55,902 shares upon RSU vesting and had 22,804 shares withheld for taxes, ending with 100,751 directly owned shares of common stock.

On January 27, 2026, SIGA Technologies Inc. CEO Diem Nguyen had one-third of a previously granted RSU award vest, resulting in the acquisition of 55,902 shares of common stock at a deemed price of $0 per share, increasing her direct holdings to 123,555 shares before tax withholding. To satisfy tax obligations associated with this vesting, the issuer withheld 22,804 shares at an implied price of $6.82 per share, reducing her direct post-withholding ownership to 100,751 shares. The RSUs, originally granted on January 27, 2024, vest in three equal annual installments, and this filing reflects routine equity compensation vesting rather than an open-market purchase or discretionary sale.

Filing Facts

CIK

1010086

Ticker

SIGA

Form

4

Source Type

sec

Accession

0001193125-26-027202

Alert Tier

5