MAST THERAPEUTICS INC

CUSIP: 576314108 Class: COM

Pine River Capital Management L.P.'s Holding History (CIK: 0001288136)

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

Q3 2016
Shares 1,250,000 Value ($000) $0 Avg Close — Range —
Q2 2016
Shares 1,250,000 Value ($000) $0 Avg Close — Range —
Q1 2016
Shares 1,250,000 Value ($000) $0 Avg Close — Range —
Q4 2015
Shares 1,250,000 Value ($000) $0 Avg Close — Range —
Q3 2015
Shares 1,250,000 Value ($000) $3 Avg Close — Range —
Q2 2015
Shares 1,250,000 Value ($000) $2 Avg Close — Range —
Q1 2015
Shares 687,500 Value ($000) $1 Avg Close — Range —
Q4 2014
Shares 687,500 Value ($000) $4 Avg Close — Range —
Q3 2014
Shares 687,500 Value ($000) $5 Avg Close — Range —
Q2 2014
Shares 62,500 Value ($000) $2 Avg Close — Range —
Q4 2013
Shares 62,500 Value ($000) $1 Avg Close — Range —
Q2 2013
Shares 2,578,486 Value ($000) $1,106 Avg Close — Range —
Q1 2013
Shares 625,000 Value ($000) $474 Avg Close — Range —