ACHILLION PHARMACEUTICALS IN

CUSIP: 00448Q201 Class: COM

DEERFIELD MANAGEMENT COMPANY, L.P.'s Holding History (CIK: 0001009258)

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

Q4 2015
Shares 1,667,000 Value ($000) $17,987 Avg Close — Range —
Q3 2015
Shares 1,667,000 Value ($000) $11,519 Avg Close — Range —
Q1 2015
Shares 2,810,164 Value ($000) $27,708 Avg Close — Range —
Q4 2014
Shares 2,920,300 Value ($000) $35,774 Avg Close — Range —
Q2 2014
Shares 12,500 Value ($000) $95 Avg Close — Range —
Q1 2014
Shares 92,804 Value ($000) $305 Avg Close — Range —
Q2 2013
Shares 1,629,833 Value ($000) $13,332 Avg Close — Range —