MAST THERAPEUTICS INC

CUSIP: 576314108 Class: COM

WESTFIELD CAPITAL MANAGEMENT CO LP's Holding History (CIK: 0001177719)

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

Q3 2013
Shares 337,600 Value ($000) $148 Avg Close — Range —
Q2 2013
Shares 337,600 Value ($000) $145 Avg Close — Range —