BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

BAKER BROS. ADVISORS LP's Holding History (CIK: 0001263508)

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

Q1 2017

Shares 16,500 Value ($000) $4,511 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 16,500 Value ($000) $4,679 Avg Close $296.43 Range $268.00 - $329.83

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2017	16,500	$4,511	$282.75	$260.50 - $301.42
Q4 2016	16,500	$4,679	$296.43	$268.00 - $329.83