ALTERRA CAPITAL HOLDINGS LIM

CUSIP: G0229R108 Class: CMN

Westchester Capital Management, LLC's Holding History (CIK: 0001512805)

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

Q1 2013
Shares 266,700 Value ($000) $8,401 Avg Close — Range —
Q4 2012
Shares 266,700 Value ($000) $7,518 Avg Close — Range —