X0306 4 2012-08-14 0 0001142576 OPTIMER PHARMACEUTICALS INC OPTR 0001380521 Gorbach MD Sherwood 10110 SORRENTO VALLEY ROAD SUITE C SAN DIEGO CA 92121 0 1 0 0 Chief Scientific Officer, SVP Common stock 2012-08-11 4 A 0 3500 0 A 42219 D The award will vest as to one-third (1/3) of the restricted stock units annually on each anniversary of the vesting commencement date, so that the restricted stock units are fully vested on the third anniversary of the vesting commencement date. Notwithstanding the foregoing, vesting shall terminate upon the participant's termination of continuous service as a service provider. Meredith Schaum, attorney-in-fact 2012-08-14