OPTIMER PHARMACEUTICALS INC

CUSIP: 68401H104 Class: CMN

GROUP ONE TRADING, L.P.'s Holding History (CIK: 0000932540)

Note: Option positions (PUT/CALL) are excluded.

Q3 2013
Shares 197,153 Value ($000) $2,484 Avg Close — Range —
Q2 2013
Shares 115,096 Value ($000) $1,665 Avg Close — Range —