ALEXION PHARMACEUTICALS INC

CUSIP: 15351109 Class: Common Stock

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

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

Q3 2016
Shares 1,900 Value ($000) $233 Avg Close — Range —
Q2 2016
Shares 1,300 Value ($000) $152 Avg Close — Range —
Q4 2015
Shares 3,742 Value ($000) $714 Avg Close — Range —
Q4 2014
Shares 3,459 Value ($000) $640 Avg Close — Range —
Q3 2014
Shares 3,584 Value ($000) $594 Avg Close — Range —
Q2 2014
Shares 3,584 Value ($000) $560 Avg Close — Range —
Q1 2014
Shares 6,109 Value ($000) $929 Avg Close — Range —