BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

Capital Research Global Investors's Holding History (CIK: 0001422848)

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

Q4 2014

Shares 300,000 Value ($000) $101,835 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 5,456,600 Value ($000) $1,805,098 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 8,198,550 Value ($000) $2,585,085 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 8,543,550 Value ($000) $2,613,216 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 9,157,000 Value ($000) $2,561,671 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 8,842,000 Value ($000) $2,128,800 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 9,130,000 Value ($000) $1,964,776 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2014	300,000	$101,835	$323.51	$290.85 - $361.93
Q3 2014	5,456,600	$1,805,098	$329.72	$298.31 - $349.00
Q2 2014	8,198,550	$2,585,085	$300.97	$272.02 - $322.25
Q1 2014	8,543,550	$2,613,216	$317.43	$270.62 - $358.89
Q4 2013	9,157,000	$2,561,671	$258.65	$221.07 - $298.82
Q3 2013	8,842,000	$2,128,800	$223.81	$203.55 - $248.95
Q2 2013	9,130,000	$1,964,776	$213.68	$191.80 - $242.64