BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

D. E. Shaw & Co., Inc.'s Holding History (CIK: 0001009207)

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

Q4 2025

Shares 53,754 Value ($000) $9,460 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 477,924 Value ($000) $66,948 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 1,366,207 Value ($000) $171,582 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 1,585,572 Value ($000) $216,970 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 1,609,899 Value ($000) $246,186 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 434,939 Value ($000) $84,309 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 214,691 Value ($000) $49,770 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 300,008 Value ($000) $64,691 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 23,935 Value ($000) $6,194 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 278,838 Value ($000) $71,664 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 846,444 Value ($000) $241,110 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 1,333,990 Value ($000) $370,889 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 1,756,082 Value ($000) $486,294 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 1,535,315 Value ($000) $409,929 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 1,355,854 Value ($000) $276,513 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 993,880 Value ($000) $209,312 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 596,961 Value ($000) $143,222 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 376,491 Value ($000) $106,543 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 789,693 Value ($000) $273,447 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 609,240 Value ($000) $170,435 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 687,793 Value ($000) $168,413 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 367,892 Value ($000) $104,364 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 843,706 Value ($000) $225,733 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 416,343 Value ($000) $131,723 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 1,583,823 Value ($000) $469,967 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 2,668,853 Value ($000) $621,363 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 2,572,976 Value ($000) $601,742 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 1,048,621 Value ($000) $247,873 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 397,153 Value ($000) $119,511 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 443,831 Value ($000) $156,810 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 335,829 Value ($000) $97,471 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 954,925 Value ($000) $261,477 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 476,138 Value ($000) $151,683 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 609,933 Value ($000) $190,982 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 1,305,858 Value ($000) $354,357 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 1,559,055 Value ($000) $426,277 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 1,811,083 Value ($000) $513,587 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 1,611,384 Value ($000) $504,412 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 1,615,650 Value ($000) $390,697 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 2,228,217 Value ($000) $580,049 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 2,092,609 Value ($000) $641,070 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 598,378 Value ($000) $174,613 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 149,509 Value ($000) $60,392 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 912,933 Value ($000) $385,477 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 199,940 Value ($000) $67,870 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 204,321 Value ($000) $67,592 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 12,664 Value ($000) $3,993 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 327,414 Value ($000) $100,146 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 281,886 Value ($000) $78,858 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 124,957 Value ($000) $30,085 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 250,287 Value ($000) $53,862 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	53,754	$9,460	$163.37	$138.00 - $185.17
Q3 2025	477,924	$66,948	$135.17	$121.05 - $150.28
Q2 2025	1,366,207	$171,582	$124.60	$110.04 - $137.32
Q1 2025	1,585,572	$216,970	$142.96	$128.51 - $157.09
Q4 2024	1,609,899	$246,186	$168.67	$145.07 - $195.00
Q3 2024	434,939	$84,309	$209.21	$188.78 - $238.00
Q2 2024	214,691	$49,770	$217.32	$189.44 - $237.54
Q1 2024	300,008	$64,691	$234.20	$211.02 - $268.30
Q4 2023	23,935	$6,194	$245.62	$220.86 - $269.43
Q3 2023	278,838	$71,664	$267.47	$251.85 - $287.60
Q2 2023	846,444	$241,110	$297.86	$273.39 - $319.76
Q1 2023	1,333,990	$370,889	$276.70	$254.80 - $295.90
Q4 2022	1,756,082	$486,294	$282.44	$250.31 - $311.88
Q3 2022	1,535,315	$409,929	$212.38	$193.65 - $283.44
Q2 2022	1,355,854	$276,513	$204.43	$187.16 - $225.50
Q1 2022	993,880	$209,312	$217.46	$192.67 - $249.00
Q4 2021	596,961	$143,222	$257.12	$221.72 - $290.76
Q3 2021	376,491	$106,543	$327.75	$282.64 - $372.12
Q2 2021	789,693	$273,447	$302.94	$257.03 - $468.55
Q1 2021	609,240	$170,435	$269.69	$238.40 - $296.38
Q4 2020	687,793	$168,413	$259.08	$223.25 - $363.92
Q3 2020	367,892	$104,364	$278.91	$261.87 - $312.00
Q2 2020	843,706	$225,733	$300.59	$257.60 - $350.24
Q1 2020	416,343	$131,723	$303.47	$262.25 - $374.99
Q4 2019	1,583,823	$469,967	$277.46	$219.70 - $318.00
Q3 2019	2,668,853	$621,363	$232.85	$215.78 - $246.99
Q2 2019	2,572,976	$601,742	$230.90	$219.20 - $245.35
Q1 2019	1,048,621	$247,873	$314.89	$216.12 - $344.00
Q4 2018	397,153	$119,511	$319.14	$278.46 - $358.41
Q3 2018	443,831	$156,810	$344.30	$288.13 - $388.67
Q2 2018	335,829	$97,471	$281.15	$249.17 - $310.91
Q1 2018	954,925	$261,477	$310.41	$259.76 - $370.57
Q4 2017	476,138	$151,683	$320.80	$301.81 - $348.84
Q3 2017	609,933	$190,982	$296.11	$269.50 - $330.00
Q2 2017	1,305,858	$354,357	$264.42	$244.28 - $291.90
Q1 2017	1,559,055	$426,277	$282.75	$260.50 - $301.42
Q4 2016	1,811,083	$513,587	$296.43	$268.00 - $329.83
Q3 2016	1,611,384	$504,412	$296.18	$240.07 - $333.65
Q2 2016	1,615,650	$390,697	$263.54	$223.02 - $292.69
Q1 2016	2,228,217	$580,049	$264.15	$242.07 - $301.02
Q4 2015	2,092,609	$641,070	$287.35	$254.00 - $311.65
Q3 2015	598,378	$174,613	$330.23	$265.00 - $412.24
Q2 2015	149,509	$60,392	$401.33	$368.88 - $432.88
Q1 2015	912,933	$385,477	$394.14	$334.40 - $480.18
Q4 2014	199,940	$67,870	$323.51	$290.85 - $361.93
Q3 2014	204,321	$67,592	$329.72	$298.31 - $349.00
Q2 2014	12,664	$3,993	$300.97	$272.02 - $322.25
Q1 2014	327,414	$100,146	$317.43	$270.62 - $358.89
Q4 2013	281,886	$78,858	$258.65	$221.07 - $298.82
Q3 2013	124,957	$30,085	$223.81	$203.55 - $248.95
Q2 2013	250,287	$53,862	$213.68	$191.80 - $242.64