BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

Artisan Partners Limited Partnership's Holding History (CIK: 0001466153)

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

Q3 2015

Shares 222,326 Value ($000) $64,877 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 414,178 Value ($000) $167,303 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 469,933 Value ($000) $198,425 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 574,188 Value ($000) $194,908 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 490,677 Value ($000) $162,321 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 453,049 Value ($000) $142,851 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 328,877 Value ($000) $100,594 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 274,056 Value ($000) $76,667 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 262,280 Value ($000) $63,147 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 239,216 Value ($000) $51,479,283 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2015	222,326	$64,877	$330.23	$265.00 - $412.24
Q2 2015	414,178	$167,303	$401.33	$368.88 - $432.88
Q1 2015	469,933	$198,425	$394.14	$334.40 - $480.18
Q4 2014	574,188	$194,908	$323.51	$290.85 - $361.93
Q3 2014	490,677	$162,321	$329.72	$298.31 - $349.00
Q2 2014	453,049	$142,851	$300.97	$272.02 - $322.25
Q1 2014	328,877	$100,594	$317.43	$270.62 - $358.89
Q4 2013	274,056	$76,667	$258.65	$221.07 - $298.82
Q3 2013	262,280	$63,147	$223.81	$203.55 - $248.95
Q2 2013	239,216	$51,479,283	$213.68	$191.80 - $242.64