BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

Main Street Research LLC's Holding History (CIK: 0001513211)

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

Q1 2020

Shares 55,689 Value ($000) $17,619 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 56,706 Value ($000) $16,826 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 57,006 Value ($000) $13,272 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 6,350 Value ($000) $1,485 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 6,420 Value ($000) $1,518 Avg Close $314.89 Range $216.12 - $344.00

Q3 2018

Shares 3,182 Value ($000) $1,124 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 3,290 Value ($000) $955 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 3,290 Value ($000) $901 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 3,204 Value ($000) $1,021 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 3,544 Value ($000) $1,110 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 3,896 Value ($000) $1,057 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 4,148 Value ($000) $1,134 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 4,293 Value ($000) $1,217 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 4,283 Value ($000) $1,341 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 4,793 Value ($000) $1,159 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 4,793 Value ($000) $1,248 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 4,853 Value ($000) $1,487 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 4,853 Value ($000) $1,410 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 4,918 Value ($000) $1,987 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 4,933 Value ($000) $2,083 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 5,238 Value ($000) $1,778 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 5,238 Value ($000) $1,733 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 5,198 Value ($000) $1,639 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 5,198 Value ($000) $1,590 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 5,198 Value ($000) $1,453 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 5,218 Value ($000) $1,256 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 5,938 Value ($000) $1,278 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2020	55,689	$17,619	$303.47	$262.25 - $374.99
Q4 2019	56,706	$16,826	$277.46	$219.70 - $318.00
Q3 2019	57,006	$13,272	$232.85	$215.78 - $246.99
Q2 2019	6,350	$1,485	$230.90	$219.20 - $245.35
Q1 2019	6,420	$1,518	$314.89	$216.12 - $344.00
Q3 2018	3,182	$1,124	$344.30	$288.13 - $388.67
Q2 2018	3,290	$955	$281.15	$249.17 - $310.91
Q1 2018	3,290	$901	$310.41	$259.76 - $370.57
Q4 2017	3,204	$1,021	$320.80	$301.81 - $348.84
Q3 2017	3,544	$1,110	$296.11	$269.50 - $330.00
Q2 2017	3,896	$1,057	$264.42	$244.28 - $291.90
Q1 2017	4,148	$1,134	$282.75	$260.50 - $301.42
Q4 2016	4,293	$1,217	$296.43	$268.00 - $329.83
Q3 2016	4,283	$1,341	$296.18	$240.07 - $333.65
Q2 2016	4,793	$1,159	$263.54	$223.02 - $292.69
Q1 2016	4,793	$1,248	$264.15	$242.07 - $301.02
Q4 2015	4,853	$1,487	$287.35	$254.00 - $311.65
Q3 2015	4,853	$1,410	$330.23	$265.00 - $412.24
Q2 2015	4,918	$1,987	$401.33	$368.88 - $432.88
Q1 2015	4,933	$2,083	$394.14	$334.40 - $480.18
Q4 2014	5,238	$1,778	$323.51	$290.85 - $361.93
Q3 2014	5,238	$1,733	$329.72	$298.31 - $349.00
Q2 2014	5,198	$1,639	$300.97	$272.02 - $322.25
Q1 2014	5,198	$1,590	$317.43	$270.62 - $358.89
Q4 2013	5,198	$1,453	$258.65	$221.07 - $298.82
Q3 2013	5,218	$1,256	$223.81	$203.55 - $248.95
Q2 2013	5,938	$1,278	$213.68	$191.80 - $242.64