BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

MORGAN STANLEY's Holding History (CIK: 0000895421)

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

Q4 2025

Shares 2,325,013 Value ($000) $409,180 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 2,251,535 Value ($000) $315,395 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 1,956,210 Value ($000) $245,681 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 1,990,668 Value ($000) $272,404 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 1,782,356 Value ($000) $272,558 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 1,887,246 Value ($000) $365,824 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 1,606,508 Value ($000) $372,421 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 1,701,383 Value ($000) $366,870 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 1,577,777 Value ($000) $408,282 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 1,493,113 Value ($000) $383,745 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 1,431,299 Value ($000) $407,706 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 1,305,851 Value ($000) $363,066 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 1,422,816 Value ($000) $394,006 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 1,242,804 Value ($000) $331,829 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 1,376,935 Value ($000) $280,813 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 955,829 Value ($000) $201,298 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 780,480 Value ($000) $187,253 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 753,715 Value ($000) $213,294 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 702,175 Value ($000) $243,141 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 617,787 Value ($000) $172,825 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 777,503 Value ($000) $190,380 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 693,397 Value ($000) $196,704 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 376,716 Value ($000) $100,789 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 371,913 Value ($000) $117,665 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 426,216 Value ($000) $126,471 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 662,150 Value ($000) $154,163 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 498,215 Value ($000) $116,518 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 963,663 Value ($000) $227,790 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 1,012,746 Value ($000) $304,757 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 976,505 Value ($000) $345,008 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 1,751,109 Value ($000) $508,240 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 1,087,013 Value ($000) $297,646 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 1,095,747 Value ($000) $349,074 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 1,097,950 Value ($000) $343,789 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 1,079,277 Value ($000) $292,874 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 963,780 Value ($000) $263,516 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 966,700 Value ($000) $274,139 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 1,016,194 Value ($000) $318,100 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 998,363 Value ($000) $241,422 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 1,077,432 Value ($000) $280,478 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 1,238,944 Value ($000) $379,550 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 1,326,414 Value ($000) $387,061 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 1,296,650 Value ($000) $523,770 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 1,317,915 Value ($000) $556,477 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 1,568,496 Value ($000) $532,425 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 1,258,591 Value ($000) $416,353 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 936,791 Value ($000) $295,378 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 798,262 Value ($000) $244,164 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 801,903 Value ($000) $224,188 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 411,554 Value ($000) $99,085 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 579,756 Value ($000) $124,763 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	2,325,013	$409,180	$163.37	$138.00 - $185.17
Q3 2025	2,251,535	$315,395	$135.17	$121.05 - $150.28
Q2 2025	1,956,210	$245,681	$124.60	$110.04 - $137.32
Q1 2025	1,990,668	$272,404	$142.96	$128.51 - $157.09
Q4 2024	1,782,356	$272,558	$168.67	$145.07 - $195.00
Q3 2024	1,887,246	$365,824	$209.21	$188.78 - $238.00
Q2 2024	1,606,508	$372,421	$217.32	$189.44 - $237.54
Q1 2024	1,701,383	$366,870	$234.20	$211.02 - $268.30
Q4 2023	1,577,777	$408,282	$245.62	$220.86 - $269.43
Q3 2023	1,493,113	$383,745	$267.47	$251.85 - $287.60
Q2 2023	1,431,299	$407,706	$297.86	$273.39 - $319.76
Q1 2023	1,305,851	$363,066	$276.70	$254.80 - $295.90
Q4 2022	1,422,816	$394,006	$282.44	$250.31 - $311.88
Q3 2022	1,242,804	$331,829	$212.38	$193.65 - $283.44
Q2 2022	1,376,935	$280,813	$204.43	$187.16 - $225.50
Q1 2022	955,829	$201,298	$217.46	$192.67 - $249.00
Q4 2021	780,480	$187,253	$257.12	$221.72 - $290.76
Q3 2021	753,715	$213,294	$327.75	$282.64 - $372.12
Q2 2021	702,175	$243,141	$302.94	$257.03 - $468.55
Q1 2021	617,787	$172,825	$269.69	$238.40 - $296.38
Q4 2020	777,503	$190,380	$259.08	$223.25 - $363.92
Q3 2020	693,397	$196,704	$278.91	$261.87 - $312.00
Q2 2020	376,716	$100,789	$300.59	$257.60 - $350.24
Q1 2020	371,913	$117,665	$303.47	$262.25 - $374.99
Q4 2019	426,216	$126,471	$277.46	$219.70 - $318.00
Q3 2019	662,150	$154,163	$232.85	$215.78 - $246.99
Q2 2019	498,215	$116,518	$230.90	$219.20 - $245.35
Q1 2019	963,663	$227,790	$314.89	$216.12 - $344.00
Q4 2018	1,012,746	$304,757	$319.14	$278.46 - $358.41
Q3 2018	976,505	$345,008	$344.30	$288.13 - $388.67
Q2 2018	1,751,109	$508,240	$281.15	$249.17 - $310.91
Q1 2018	1,087,013	$297,646	$310.41	$259.76 - $370.57
Q4 2017	1,095,747	$349,074	$320.80	$301.81 - $348.84
Q3 2017	1,097,950	$343,789	$296.11	$269.50 - $330.00
Q2 2017	1,079,277	$292,874	$264.42	$244.28 - $291.90
Q1 2017	963,780	$263,516	$282.75	$260.50 - $301.42
Q4 2016	966,700	$274,139	$296.43	$268.00 - $329.83
Q3 2016	1,016,194	$318,100	$296.18	$240.07 - $333.65
Q2 2016	998,363	$241,422	$263.54	$223.02 - $292.69
Q1 2016	1,077,432	$280,478	$264.15	$242.07 - $301.02
Q4 2015	1,238,944	$379,550	$287.35	$254.00 - $311.65
Q3 2015	1,326,414	$387,061	$330.23	$265.00 - $412.24
Q2 2015	1,296,650	$523,770	$401.33	$368.88 - $432.88
Q1 2015	1,317,915	$556,477	$394.14	$334.40 - $480.18
Q4 2014	1,568,496	$532,425	$323.51	$290.85 - $361.93
Q3 2014	1,258,591	$416,353	$329.72	$298.31 - $349.00
Q2 2014	936,791	$295,378	$300.97	$272.02 - $322.25
Q1 2014	798,262	$244,164	$317.43	$270.62 - $358.89
Q4 2013	801,903	$224,188	$258.65	$221.07 - $298.82
Q3 2013	411,554	$99,085	$223.81	$203.55 - $248.95
Q2 2013	579,756	$124,763	$213.68	$191.80 - $242.64