X0306 4 2019-07-31 0001010086 SIGA TECHNOLOGIES INC SIGA 0001512677 Luckshire Daniel J C/O SIGA TECHNOLOGIES, INC. 31 EAST 62ND STREET NEW YORK NY 10065 true Executive VP & CFO Common Stock, par value $.0001 per share 2019-07-31 4 A 0 26666 0 A 232731 D Common Stock, par value $.0001 per share 2019-07-31 4 F 0 12788 5.6 D 219943 D Restricted Stock Units 2019-07-31 4 A 0 53334 0 A Common Stock, par value $.0001 per share 53334 53334 D This Form 4 reports the grant to the Reporting Person of 26,666 shares of common stock of SIGA Technologies (the "Issuer") pursuant to the Issuer's 2010 Stock Incentive Plan and the related surrender to the Issuer of 12,788 of such shares to satisfy certain tax withholding obligations of the Issuer associated with such grant. No shares of common stock of the Issuer were sold by the Reporting Person in a market transaction. The RSUs vest in equal yearly installments over a period of two (2) years, with the first 1/2 of such RSUs vesting on July 31, 2020 and the remaining 1/2 of such RSUs vesting on July 31, 2021. Each RSU converts into one share of Common Stock of the Issuer on a one for one basis. /s/ Daniel J. Luckshire 2019-08-02