X0306 4 2019-06-05 0001010086 SIGA TECHNOLOGIES INC SIGA 0001315696 Antal James C/O SIGA TECHNOLOGIES, INC., 31 EAST 62ND STREET NEW YORK NY 10065 true Common Stock, Par Value $.0001 Per Share 2019-06-05 4 S 0 30000 5.7 D 130875 D This Form 4 reports the sale by the reporting person of 30,000 shares of Common Stock for financial planning and tax purposes. The price reported in Column 4 is a weighted average price. These shares were sold on June 5, 2019 in multiple transactions at prices ranging from $5.65 to $5.75, inclusive. The reporting person undertakes to provide to SIGA Technologies, Inc., any security holder of SIGA Technologies, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2) to this Form 4. /s/ James Antal 2019-06-07