X0306 4 2019-02-01 0 0001478121 Pfenex Inc. PFNX 0001624925 Knudson Susan A. C/O PFENEX INC., 10790 ROSELLE STREET SAN DIEGO CA 92121 0 1 0 0 Chief Financial Officer Stock Option (right to buy) 3.90 2019-02-01 4 A 0 59000 0.00 A 2029-02-01 Common Stock 59000 59000 D Twenty five percent (25%) of the shares subject to the Option shall vest and become exercisable on the one year anniversary of the Vesting Commencement Date and one forty-eighth (1/48th) of the total number of shares subject to the Option shall vest every month thereafter such that all shares shall be fully vested on the four (4) year anniversary of the Vesting Commencement Date, subject to the reporting person continuing to be a Service Provider (as such term is defined in the Issuer's 2014 Equity Incentive Plan) through each such date. "Vesting Commencement Date" shall mean February 1, 2019. Exhibit 24 - Power of Attorney /s/ Patricia Lady, as Attorney-in-Fact 2019-02-04