BLUEBIRD BIO INC

CUSIP: 09609G100 Class: Common Stock

Portolan Capital Management, LLC's Holding History (CIK: 0001350290)

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

Q2 2016
Shares 37,090 Value ($000) $1,606 Avg Close — Range —
Q1 2016
Shares 64,065 Value ($000) $2,723 Avg Close — Range —
Q4 2015
Shares 54,710 Value ($000) $3,513 Avg Close — Range —