ALEXION PHARMACEUTICALS INC

CUSIP: 015351109 Class: COM

ESSEX INVESTMENT MANAGEMENT CO LLC's Holding History (CIK: 0000201772)

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

Q4 2015
Shares 4,284 Value ($000) $817 Avg Close — Range —
Q3 2015
Shares 4,284 Value ($000) $670 Avg Close — Range —
Q2 2015
Shares 4,284 Value ($000) $774 Avg Close — Range —
Q1 2015
Shares 6,322 Value ($000) $1,096 Avg Close — Range —
Q4 2014
Shares 3,582 Value ($000) $663 Avg Close — Range —
Q3 2014
Shares 3,588 Value ($000) $595 Avg Close — Range —
Q2 2014
Shares 3,603 Value ($000) $563 Avg Close — Range —
Q1 2014
Shares 4,126 Value ($000) $628 Avg Close — Range —
Q4 2013
Shares 5,637 Value ($000) $749 Avg Close — Range —
Q3 2013
Shares 5,101 Value ($000) $593 Avg Close — Range —
Q2 2013
Shares 7,137 Value ($000) $658 Avg Close — Range —