ONYX PHARMACEUTICALS INC

CUSIP: 683399109 Class: COM

OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AM's Holding History (CIK: 0001132716)

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

Q3 2013
Shares 484,886 Value ($000) $60,451,000 Avg Close — Range —
Q2 2013
Shares 40,000 Value ($000) $3,473,000 Avg Close — Range —