ALEXION PHARMACEUTICALS INC

CUSIP: 015351109 Class: COM

PERCEPTIVE ADVISORS LLC's Holding History (CIK: 0001224962)

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

Q2 2018
Shares 463,450 Value ($000) $57,537 Avg Close — Range —
Q1 2018
Shares 873,450 Value ($000) $97,355 Avg Close — Range —