BLUEBIRD BIO INC

CUSIP: 09609G100 Class: Common Stock

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

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

Q4 2017
Shares 14,400 Value ($000) $2,565 Avg Close — Range —
Q2 2017
Shares 20,000 Value ($000) $2,101 Avg Close — Range —
Q1 2017
Shares 4,644 Value ($000) $422 Avg Close — Range —
Q1 2015
Shares 135,000 Value ($000) $16,304 Avg Close — Range —
Q4 2014
Shares 225,000 Value ($000) $20,637 Avg Close — Range —
Q1 2014
Shares 20,000 Value ($000) $455 Avg Close — Range —
Q4 2013
Shares 20,000 Value ($000) $420 Avg Close — Range —