OPTIMER PHARMACEUTICALS INC

CUSIP: 68401H104 Class: CMN

PRICE T ROWE ASSOCIATES INC /MD/'s Holding History (CIK: 0000080255)

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

Q3 2013
Shares 2,466,300 Value ($000) $31,075 Avg Close — Range —
Q2 2013
Shares 5,127,008 Value ($000) $74,188 Avg Close — Range —