BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

DSM Capital Partners LLC's Holding History (CIK: 0001214639)

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

Q2 2015

Shares 856,614 Value ($000) $346,022 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 780,018 Value ($000) $329,355 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 898,165 Value ($000) $304,883 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 769,328 Value ($000) $254,502 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 527,579 Value ($000) $166,352 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 419,674 Value ($000) $128,366 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 720,421 Value ($000) $201,410 Avg Close $258.65 Range $221.07 - $298.82

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2015	856,614	$346,022	$401.33	$368.88 - $432.88
Q1 2015	780,018	$329,355	$394.14	$334.40 - $480.18
Q4 2014	898,165	$304,883	$323.51	$290.85 - $361.93
Q3 2014	769,328	$254,502	$329.72	$298.31 - $349.00
Q2 2014	527,579	$166,352	$300.97	$272.02 - $322.25
Q1 2014	419,674	$128,366	$317.43	$270.62 - $358.89
Q4 2013	720,421	$201,410	$258.65	$221.07 - $298.82