BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

ADAGE CAPITAL PARTNERS GP, L.L.C.'s Holding History (CIK: 0001165408)

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

Q4 2025

Shares 294,357 Value ($000) $51,804 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 332,132 Value ($000) $46,525 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 247,937 Value ($000) $31,138 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 70,767 Value ($000) $9,684 Avg Close $142.96 Range $128.51 - $157.09

Q3 2024

Shares 45,799 Value ($000) $8,878 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 137,699 Value ($000) $31,921 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 251,582 Value ($000) $54,249 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 355,808 Value ($000) $92,072 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 60,895 Value ($000) $15,651 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 402,056 Value ($000) $114,526 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 332,023 Value ($000) $92,312 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 222,599 Value ($000) $61,642 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 247,799 Value ($000) $66,162 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 152,499 Value ($000) $31,101 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 18,399 Value ($000) $3,875 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 181,499 Value ($000) $43,545 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 113,099 Value ($000) $32,006 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 135,399 Value ($000) $46,885 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 171,987 Value ($000) $48,113 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 169,687 Value ($000) $41,550 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 176,880 Value ($000) $50,177 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 55,590 Value ($000) $14,873 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 205,890 Value ($000) $65,139 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 208,700 Value ($000) $61,928 Avg Close $277.46 Range $219.70 - $318.00

Q1 2019

Shares 113,976 Value ($000) $26,942 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 247,302 Value ($000) $74,418 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 258,707 Value ($000) $91,404 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 280,197 Value ($000) $81,324 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 284,668 Value ($000) $77,948 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 299,643 Value ($000) $95,457 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 245,369 Value ($000) $76,830 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 268,735 Value ($000) $72,924 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 278,435 Value ($000) $76,130 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 304,935 Value ($000) $86,473 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 305,186 Value ($000) $95,532 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 317,592 Value ($000) $76,800 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 374,324 Value ($000) $97,444 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 225,124 Value ($000) $68,967 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 382,424 Value ($000) $111,595 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 573,124 Value ($000) $231,508 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 446,124 Value ($000) $188,371 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 424,124 Value ($000) $143,969 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 549,224 Value ($000) $181,689 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 323,824 Value ($000) $102,105 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 455,524 Value ($000) $139,331 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 689,624 Value ($000) $192,800 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 895,924 Value ($000) $215,703 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 870,924 Value ($000) $187,423 Avg Close $213.68 Range $191.80 - $242.64

Q1 2013

Shares 275,324 Value ($000) $53,032 Avg Close $161.63 Range $139.72 - $192.92

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	294,357	$51,804	$163.37	$138.00 - $185.17
Q3 2025	332,132	$46,525	$135.17	$121.05 - $150.28
Q2 2025	247,937	$31,138	$124.60	$110.04 - $137.32
Q1 2025	70,767	$9,684	$142.96	$128.51 - $157.09
Q3 2024	45,799	$8,878	$209.21	$188.78 - $238.00
Q2 2024	137,699	$31,921	$217.32	$189.44 - $237.54
Q1 2024	251,582	$54,249	$234.20	$211.02 - $268.30
Q4 2023	355,808	$92,072	$245.62	$220.86 - $269.43
Q3 2023	60,895	$15,651	$267.47	$251.85 - $287.60
Q2 2023	402,056	$114,526	$297.86	$273.39 - $319.76
Q1 2023	332,023	$92,312	$276.70	$254.80 - $295.90
Q4 2022	222,599	$61,642	$282.44	$250.31 - $311.88
Q3 2022	247,799	$66,162	$212.38	$193.65 - $283.44
Q2 2022	152,499	$31,101	$204.43	$187.16 - $225.50
Q1 2022	18,399	$3,875	$217.46	$192.67 - $249.00
Q4 2021	181,499	$43,545	$257.12	$221.72 - $290.76
Q3 2021	113,099	$32,006	$327.75	$282.64 - $372.12
Q2 2021	135,399	$46,885	$302.94	$257.03 - $468.55
Q1 2021	171,987	$48,113	$269.69	$238.40 - $296.38
Q4 2020	169,687	$41,550	$259.08	$223.25 - $363.92
Q3 2020	176,880	$50,177	$278.91	$261.87 - $312.00
Q2 2020	55,590	$14,873	$300.59	$257.60 - $350.24
Q1 2020	205,890	$65,139	$303.47	$262.25 - $374.99
Q4 2019	208,700	$61,928	$277.46	$219.70 - $318.00
Q1 2019	113,976	$26,942	$314.89	$216.12 - $344.00
Q4 2018	247,302	$74,418	$319.14	$278.46 - $358.41
Q3 2018	258,707	$91,404	$344.30	$288.13 - $388.67
Q2 2018	280,197	$81,324	$281.15	$249.17 - $310.91
Q1 2018	284,668	$77,948	$310.41	$259.76 - $370.57
Q4 2017	299,643	$95,457	$320.80	$301.81 - $348.84
Q3 2017	245,369	$76,830	$296.11	$269.50 - $330.00
Q2 2017	268,735	$72,924	$264.42	$244.28 - $291.90
Q1 2017	278,435	$76,130	$282.75	$260.50 - $301.42
Q4 2016	304,935	$86,473	$296.43	$268.00 - $329.83
Q3 2016	305,186	$95,532	$296.18	$240.07 - $333.65
Q2 2016	317,592	$76,800	$263.54	$223.02 - $292.69
Q1 2016	374,324	$97,444	$264.15	$242.07 - $301.02
Q4 2015	225,124	$68,967	$287.35	$254.00 - $311.65
Q3 2015	382,424	$111,595	$330.23	$265.00 - $412.24
Q2 2015	573,124	$231,508	$401.33	$368.88 - $432.88
Q1 2015	446,124	$188,371	$394.14	$334.40 - $480.18
Q4 2014	424,124	$143,969	$323.51	$290.85 - $361.93
Q3 2014	549,224	$181,689	$329.72	$298.31 - $349.00
Q2 2014	323,824	$102,105	$300.97	$272.02 - $322.25
Q1 2014	455,524	$139,331	$317.43	$270.62 - $358.89
Q4 2013	689,624	$192,800	$258.65	$221.07 - $298.82
Q3 2013	895,924	$215,703	$223.81	$203.55 - $248.95
Q2 2013	870,924	$187,423	$213.68	$191.80 - $242.64
Q1 2013	275,324	$53,032	$161.63	$139.72 - $192.92