MAST THERAPEUTICS INC

CUSIP: 576314108 Class: COM

Alyeska Investment Group, L.P.'s Holding History (CIK: 0001453072)

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

Q1 2015
Shares 2,398,892 Value ($000) $1,163 Avg Close — Range —
Q4 2014
Shares 4,678,855 Value ($000) $2,620 Avg Close — Range —
Q2 2013
Shares 3,800,000 Value ($000) $1,631 Avg Close — Range —