BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

GAMCO INVESTORS, INC. ET AL's Holding History (CIK: 0000807249)

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

Q4 2017

Shares 1,650 Value ($000) $526 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 1,675 Value ($000) $524 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 1,750 Value ($000) $475 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 1,772 Value ($000) $485 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 1,872 Value ($000) $531 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 1,897 Value ($000) $594 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 4,797 Value ($000) $1,160 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 4,810 Value ($000) $1,252 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 4,805 Value ($000) $1,472 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 4,797 Value ($000) $1,400 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 4,797 Value ($000) $1,938 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 4,932 Value ($000) $2,082 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 4,935 Value ($000) $1,675 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 4,635 Value ($000) $1,533 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 4,175 Value ($000) $1,316 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 3,585 Value ($000) $1,097 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 3,710 Value ($000) $1,037 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 3,310 Value ($000) $797 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 1,820 Value ($000) $392 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2017	1,650	$526	$320.80	$301.81 - $348.84
Q3 2017	1,675	$524	$296.11	$269.50 - $330.00
Q2 2017	1,750	$475	$264.42	$244.28 - $291.90
Q1 2017	1,772	$485	$282.75	$260.50 - $301.42
Q4 2016	1,872	$531	$296.43	$268.00 - $329.83
Q3 2016	1,897	$594	$296.18	$240.07 - $333.65
Q2 2016	4,797	$1,160	$263.54	$223.02 - $292.69
Q1 2016	4,810	$1,252	$264.15	$242.07 - $301.02
Q4 2015	4,805	$1,472	$287.35	$254.00 - $311.65
Q3 2015	4,797	$1,400	$330.23	$265.00 - $412.24
Q2 2015	4,797	$1,938	$401.33	$368.88 - $432.88
Q1 2015	4,932	$2,082	$394.14	$334.40 - $480.18
Q4 2014	4,935	$1,675	$323.51	$290.85 - $361.93
Q3 2014	4,635	$1,533	$329.72	$298.31 - $349.00
Q2 2014	4,175	$1,316	$300.97	$272.02 - $322.25
Q1 2014	3,585	$1,097	$317.43	$270.62 - $358.89
Q4 2013	3,710	$1,037	$258.65	$221.07 - $298.82
Q3 2013	3,310	$797	$223.81	$203.55 - $248.95
Q2 2013	1,820	$392	$213.68	$191.80 - $242.64