XOMA CORP DEL

CUSIP: 98419J107 Class: CMN

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

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

Q4 2013
Shares 235,000 Value ($000) $1,582,000 Avg Close — Range —
Q2 2013
Shares 32,400 Value ($000) $118,000 Avg Close — Range —