X0306 4 2019-12-09 0001010086 SIGA TECHNOLOGIES INC SIGA 0001687946 Gomez Phillip Louis III C/O SIGA TECHNOLOGIES, INC., 31 EAST 62ND STREET NEW YORK NY 10065 true true Chief Executive Officer Common Stock, Par Value $.0001 Per Share 2019-12-09 4 P 0 10000 4.42 A 475782 D The price reported in Column 4 is a weighted average price. These shares were purchased on December 9, 2019 in multiple transactions at prices ranging from $4.37 to $4.43, 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 purchased at each separate price within the range set forth in this footnote (1) to this Form 4. /s/ Phillip Louis Gomez III 2019-12-10