BLUEBIRD BIO INC

CUSIP: 09609G100 Class: Common Stock

RA CAPITAL MANAGEMENT, L.P.'s Holding History (CIK: 0001346824)

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

Q3 2015
Shares 167,367 Value ($000) $14,318 Avg Close — Range —
Q2 2015
Shares 109,383 Value ($000) $18,417 Avg Close — Range —
Q1 2015
Shares 200,379 Value ($000) $24,200 Avg Close — Range —
Q4 2014
Shares 506,122 Value ($000) $46,422 Avg Close — Range —
Q3 2014
Shares 728,812 Value ($000) $26,150 Avg Close — Range —
Q2 2014
Shares 503,062 Value ($000) $19,403 Avg Close — Range —
Q1 2014
Shares 467,418 Value ($000) $10,629 Avg Close — Range —
Q4 2013
Shares 467,418 Value ($000) $9,806 Avg Close — Range —
Q3 2013
Shares 467,418 Value ($000) $12,602 Avg Close — Range —