BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

Atika Capital Management LLC's Holding History (CIK: 0001599731)

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

Q1 2020

Shares 10,000 Value ($000) $3,164 Avg Close $303.47 Range $262.25 - $374.99

Q3 2016

Shares 7,500 Value ($000) $2,347 Avg Close $296.18 Range $240.07 - $333.65

Q1 2014

Shares 8,500 Value ($000) $2,600 Avg Close $317.43 Range $270.62 - $358.89

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2020	10,000	$3,164	$303.47	$262.25 - $374.99
Q3 2016	7,500	$2,347	$296.18	$240.07 - $333.65
Q1 2014	8,500	$2,600	$317.43	$270.62 - $358.89