X0306 4 2019-03-21 0 0001305253 Eiger BioPharmaceuticals, Inc. EIGR 0001698237 Patton Stephana Eilene C/O EIGER BIOPHARMACEUTICALS, INC. 2155 PARK BLVD. PALO ALTO CA 94306 0 1 0 0 See Remarks Stock Option ( Right to Buy) 14.31 2019-03-21 4 A 0 90000 0.00 A 2029-03-20 Common Shares 90000 90000 D The option will vest as to 25% of the option shares on March 18, 2020 and vest as to the remaining shares in successive equal monthly installments for the subsequent 36 months subject to Reporting Person's continuous service status as of each such date. General Counsel, Corporate Secretary, and Chief Compliance Officer /s/ Stephana Patton 2019-03-25