BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

STEADFAST CAPITAL MANAGEMENT LP's Holding History (CIK: 0001214822)

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

Q4 2015

Shares 173,985 Value ($000) $53,300 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 952,862 Value ($000) $278,055 Avg Close $330.23 Range $265.00 - $412.24

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2015	173,985	$53,300	$287.35	$254.00 - $311.65
Q3 2015	952,862	$278,055	$330.23	$265.00 - $412.24