MEDIDATA SOLUTIONS INC

CUSIP: 58471A105 Class: COM

GROUP ONE TRADING, L.P.'s Holding History (CIK: 0000932540)

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

Q3 2018
Shares 2,270 Value ($000) $166 Avg Close — Range —
Q2 2018
Shares 2,613 Value ($000) $211 Avg Close — Range —
Q4 2017
Shares 1,122 Value ($000) $71 Avg Close — Range —
Q3 2017
Shares 829 Value ($000) $65 Avg Close — Range —
Q2 2017
Shares 395 Value ($000) $31 Avg Close — Range —
Q1 2017
Shares 595 Value ($000) $34 Avg Close — Range —