MEDIDATA SOLUTIONS INC

CUSIP: 58471A105 Class: COM

HBK INVESTMENTS L P's Holding History (CIK: 0001011443)

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

Q4 2013
Shares 11,090 Value ($000) $672 Avg Close — Range —
Q3 2013
Shares 11,473 Value ($000) $1,135 Avg Close — Range —