MEDIDATA SOLUTIONS INC

CUSIP: 58471A105 Class: COM

Atika Capital Management LLC's Holding History (CIK: 0001599731)

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

Q2 2017

Shares 32,500 Value ($000) $2,541 Avg Close — Range —

Q4 2016

Shares 38,000 Value ($000) $1,887 Avg Close — Range —

Q3 2016

Shares 45,000 Value ($000) $2,509 Avg Close — Range —

Q2 2016

Shares 55,000 Value ($000) $2,578 Avg Close — Range —

Q4 2013

Shares 4,800 Value ($000) $290 Avg Close — Range —

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2017	32,500	$2,541	—	—
Q4 2016	38,000	$1,887	—	—
Q3 2016	45,000	$2,509	—	—
Q2 2016	55,000	$2,578	—	—
Q4 2013	4,800	$290	—	—