Every Form 4 that SIGA Technologies, Inc. (SIGA) has filed with the SEC in the last 12 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A Form 4 covers the transactions officers, directors and large holders report, so if you follow SIGA and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full SIGA filings page.
SIGA Technologies director Joseph W. Marshall III reported several equity compensation-related moves. On June 9, 2026, he exercised 24,116 restricted stock units (RSUs) into common stock at a conversion price of $0.00 per share, and 7,235 common shares were disposed of to the issuer at $4.39 per share. Following these transactions, he directly held 246,523 shares of common stock. He also received a new grant of 34,169 RSUs, which fully vest on the date of SIGA’s 2027 annual meeting of stockholders; up to 10,251 of these RSUs may be settled in cash at the Board’s discretion.
SIGA Technologies director John M. Keane reported several equity compensation-related transactions. On June 9, 2026, he exercised 24,116 restricted stock units into common stock at a stated price of $0.00 per share and then returned 7,235 common shares to the issuer at $4.39 per share in a disposition to the company.
He also received a new award of 34,169 restricted stock units, which represent contingent rights to receive SIGA common stock on a one-for-one basis, with a portion eligible for cash settlement at the Board’s discretion. Following these transactions, Keane directly holds 16,881 common shares and maintains a new RSU position scheduled to fully vest at the Company’s 2027 annual meeting of stockholders.
SIGA Technologies director Harold Eugene Ford Jr. reported several equity compensation moves on June 9, 2026. He disposed of 7,235 shares of common stock back to the issuer at $4.39 per share, a disposition categorized as a return of shares to the company rather than an open-market sale.
On the same date, he exercised derivative awards to acquire 24,116 shares of common stock at a stated price of $0.00 per share, converting previously granted restricted stock units into shares. Following these transactions, he held 47,538 shares of common stock directly.
Ford also received a new grant of 34,169 restricted stock units (RSUs), each representing a contingent right to receive one share of SIGA common stock. According to the footnotes, these RSUs fully vest on the date of the company’s 2027 annual meeting of stockholders, and up to 10,251 RSUs under this award may be settled in cash rather than shares at the board’s discretion.
SIGA Technologies director Holly L. Phillips reported several equity compensation transactions in company stock. On June 9, 2026, she disposed of 7,235 shares of common stock back to the issuer at $4.39 per share and exercised derivative securities to acquire 24,116 common shares at a $0.00 exercise price. She also received a grant of 34,169 restricted stock units (RSUs) and exercised 24,116 RSUs into common stock, with the RSUs representing contingent rights to receive SIGA common shares on a one-for-one basis.
SIGA Technologies Inc director Julian Nemirovsky reported routine equity compensation moves. He exercised 24,116 restricted stock units into common shares and returned 7,235 common shares to the issuer at $4.39 per share. He also received a grant of 34,169 new RSUs that vest at the 2027 annual meeting. Following these transactions, he holds 80,989 common shares directly and 34,169 RSUs tied one-for-one to common stock, with part of the RSUs designed for cash settlement to address tax obligations.
SIGA Technologies director Jaymie A. Durnan reported routine equity compensation activity and a small disposition to the company. On June 9, 2026, Durnan exercised derivative awards to acquire 24,116 shares of common stock and, in a separate transaction, disposed of 7,235 shares back to the issuer at $4.39 per share. Following these transactions, Durnan directly owned 95,989 shares of common stock. In addition, Durnan received a grant of 34,169 restricted stock units (RSUs), which represent contingent rights to receive common stock on a one-for-one basis and fully vest on the date of SIGA’s 2027 annual meeting of stockholders, with up to 10,251 of these RSUs expected to be settled in cash value under the Board compensation program.
SIGA Technologies director Gary J. Nabel reported several equity compensation transactions. On June 9, 2026, he exercised 24,116 restricted stock units into the same number of common shares at a stated price of $0.00 per share and then disposed of 7,235 common shares back to the company at $4.39 per share in a transaction classified as a disposition to the issuer. Following these moves, he directly held 73,754 shares of common stock. Nabel also reported a prior grant of 34,169 restricted stock units, which vest on the date of the company’s 2027 annual meeting of stockholders, with footnotes noting that a portion of these RSUs may be cash-settled to address tax obligations.
SIGA Technologies General Counsel Larry R. Miller reported routine equity compensation activity. On March 25, 2026, one-third of previously granted restricted stock units vested, resulting in the acquisition of 6,920 shares of common stock. To cover tax obligations, 3,526 shares were withheld by the company, leaving Miller with 51,912 common shares held directly after these transactions. The RSUs vest in three equal annual installments from the original March 25, 2024 grant date.
SIGA Technologies Executive VP & CFO Daniel J. Luckshire reported routine equity compensation activity tied to restricted stock units (RSUs). On March 13, 2026, one-third of a prior RSU grant vested, resulting in 11,503 shares of Common Stock being issued at a conversion price of $0.00 per share.
To cover tax withholding obligations from the RSU vesting and share issuance, the company withheld 6,074 shares of Common Stock, valued at $5.26 per share based on the closing price on March 13, 2026. On the same date, Luckshire also received a new grant of 55,228 RSUs, which represent contingent rights to receive Common Stock on a one-for-one basis and vest over three years, one-third on each of the first three anniversaries of the grant date.
Following these transactions, Luckshire directly owns 280,493 shares of SIGA Technologies Common Stock and holds 55,228 RSUs. The filing reflects compensation-related vesting, a new RSU award, and tax withholding, rather than open-market buying or selling.
SIGA Technologies EVP and Chief Scientific Officer Dennis E. Hruby reported routine equity compensation activity. On March 13, 2026, one-third of a prior restricted stock unit (RSU) grant vested, converting 11,445 RSUs into the same number of common shares, while 3,955 shares were withheld at $5.26 per share to cover taxes. Following these transactions, he held 198,537 common shares directly. He also received a new award of 54,942 RSUs, which vest in three equal annual installments.
SIGA Technologies General Counsel Larry R. Miller reported routine equity compensation activity. On March 13, 2026, 21,261 restricted stock units vested and were settled into the same number of common shares. To cover associated tax obligations, the company withheld 11,187 shares at $5.26 per share. Miller also received a new grant of 68,060 restricted stock units, which vest in three equal annual installments from the grant date. Following these transactions, he directly holds 48,518 shares of common stock and has 68,060 restricted stock units outstanding.
SIGA Technologies Chief Executive Officer Diem Nguyen reported equity compensation activity involving restricted stock units (RSUs) and common shares on March 13, 2026. Nguyen exercised RSUs into 85,045 shares of common stock upon vesting of one-third of RSUs originally granted on March 13, 2025.
As part of this vesting, 47,029 shares of common stock were withheld by the company at $5.26 per share to cover tax obligations, rather than being sold in the market. In a separate transaction the same day, Nguyen received a new grant of 272,243 RSUs, each representing a contingent right to one share of common stock that vests over three years in equal annual installments.
Following these transactions, Nguyen directly owned 138,767 shares of common stock and held 272,243 RSUs, reflecting routine compensation-related equity awards and associated tax withholding.
SIGA Technologies Chief Executive Officer Diem Nguyen reported equity compensation activity involving restricted stock units and common shares. On January 27, 2026, 55,902 restricted stock units vested and converted into the same number of common shares at an exercise price of $0 per share.
To cover tax withholding related to this vesting, the issuer withheld 22,804 common shares at $6.82 per share, reducing Nguyen’s directly held common shares to 100,751. Following these transactions, Nguyen also held 55,903 restricted stock units, which continue to vest in equal annual installments over three years from the January 27, 2024 grant date.