BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

BROWN ADVISORY INC's Holding History (CIK: 0001345929)

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

Q4 2025

Shares 7,191 Value ($000) $1,266 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 7,213 Value ($000) $1,010 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 7,231 Value ($000) $908 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 7,257 Value ($000) $993 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 347,566 Value ($000) $53,150 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 333,227 Value ($000) $64,593 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 347,518 Value ($000) $80,562 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 272,880 Value ($000) $58,841 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 171,304 Value ($000) $44,328 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 169,022 Value ($000) $43,440 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 164,803 Value ($000) $46,944 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 161,213 Value ($000) $44,822 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 149,631 Value ($000) $41,436 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 125,400 Value ($000) $33,481 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 116,375 Value ($000) $23,733 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 109,135 Value ($000) $22,984 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 199,326 Value ($000) $47,823 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 55,507 Value ($000) $15,708 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 12,344 Value ($000) $4,275 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 8,391 Value ($000) $2,348 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 4,455 Value ($000) $1,090 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 4,550 Value ($000) $1,290 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 4,426 Value ($000) $1,184 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 5,436 Value ($000) $1,720 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 6,278 Value ($000) $1,864 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 6,452 Value ($000) $1,502 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 6,625 Value ($000) $1,550 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 7,962 Value ($000) $1,882 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 11,959 Value ($000) $3,600 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 11,648 Value ($000) $4,115 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 12,434 Value ($000) $3,609 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 12,295 Value ($000) $3,366 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 7,956 Value ($000) $2,534 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 7,804 Value ($000) $2,443 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 12,746 Value ($000) $3,459 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 7,218 Value ($000) $1,973 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 7,655 Value ($000) $2,171 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 7,772 Value ($000) $2,433 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 12,031 Value ($000) $2,909 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 7,648 Value ($000) $1,991 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 9,756 Value ($000) $2,989 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 13,827 Value ($000) $4,035 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 11,402 Value ($000) $4,606 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 11,173 Value ($000) $4,718 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 12,452 Value ($000) $4,227 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 10,983 Value ($000) $3,633 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 10,907 Value ($000) $3,439 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 12,451 Value ($000) $3,809 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 13,454 Value ($000) $3,762 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 14,305 Value ($000) $3,444 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 14,397 Value ($000) $3,099 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	7,191	$1,266	$163.37	$138.00 - $185.17
Q3 2025	7,213	$1,010	$135.17	$121.05 - $150.28
Q2 2025	7,231	$908	$124.60	$110.04 - $137.32
Q1 2025	7,257	$993	$142.96	$128.51 - $157.09
Q4 2024	347,566	$53,150	$168.67	$145.07 - $195.00
Q3 2024	333,227	$64,593	$209.21	$188.78 - $238.00
Q2 2024	347,518	$80,562	$217.32	$189.44 - $237.54
Q1 2024	272,880	$58,841	$234.20	$211.02 - $268.30
Q4 2023	171,304	$44,328	$245.62	$220.86 - $269.43
Q3 2023	169,022	$43,440	$267.47	$251.85 - $287.60
Q2 2023	164,803	$46,944	$297.86	$273.39 - $319.76
Q1 2023	161,213	$44,822	$276.70	$254.80 - $295.90
Q4 2022	149,631	$41,436	$282.44	$250.31 - $311.88
Q3 2022	125,400	$33,481	$212.38	$193.65 - $283.44
Q2 2022	116,375	$23,733	$204.43	$187.16 - $225.50
Q1 2022	109,135	$22,984	$217.46	$192.67 - $249.00
Q4 2021	199,326	$47,823	$257.12	$221.72 - $290.76
Q3 2021	55,507	$15,708	$327.75	$282.64 - $372.12
Q2 2021	12,344	$4,275	$302.94	$257.03 - $468.55
Q1 2021	8,391	$2,348	$269.69	$238.40 - $296.38
Q4 2020	4,455	$1,090	$259.08	$223.25 - $363.92
Q3 2020	4,550	$1,290	$278.91	$261.87 - $312.00
Q2 2020	4,426	$1,184	$300.59	$257.60 - $350.24
Q1 2020	5,436	$1,720	$303.47	$262.25 - $374.99
Q4 2019	6,278	$1,864	$277.46	$219.70 - $318.00
Q3 2019	6,452	$1,502	$232.85	$215.78 - $246.99
Q2 2019	6,625	$1,550	$230.90	$219.20 - $245.35
Q1 2019	7,962	$1,882	$314.89	$216.12 - $344.00
Q4 2018	11,959	$3,600	$319.14	$278.46 - $358.41
Q3 2018	11,648	$4,115	$344.30	$288.13 - $388.67
Q2 2018	12,434	$3,609	$281.15	$249.17 - $310.91
Q1 2018	12,295	$3,366	$310.41	$259.76 - $370.57
Q4 2017	7,956	$2,534	$320.80	$301.81 - $348.84
Q3 2017	7,804	$2,443	$296.11	$269.50 - $330.00
Q2 2017	12,746	$3,459	$264.42	$244.28 - $291.90
Q1 2017	7,218	$1,973	$282.75	$260.50 - $301.42
Q4 2016	7,655	$2,171	$296.43	$268.00 - $329.83
Q3 2016	7,772	$2,433	$296.18	$240.07 - $333.65
Q2 2016	12,031	$2,909	$263.54	$223.02 - $292.69
Q1 2016	7,648	$1,991	$264.15	$242.07 - $301.02
Q4 2015	9,756	$2,989	$287.35	$254.00 - $311.65
Q3 2015	13,827	$4,035	$330.23	$265.00 - $412.24
Q2 2015	11,402	$4,606	$401.33	$368.88 - $432.88
Q1 2015	11,173	$4,718	$394.14	$334.40 - $480.18
Q4 2014	12,452	$4,227	$323.51	$290.85 - $361.93
Q3 2014	10,983	$3,633	$329.72	$298.31 - $349.00
Q2 2014	10,907	$3,439	$300.97	$272.02 - $322.25
Q1 2014	12,451	$3,809	$317.43	$270.62 - $358.89
Q4 2013	13,454	$3,762	$258.65	$221.07 - $298.82
Q3 2013	14,305	$3,444	$223.81	$203.55 - $248.95
Q2 2013	14,397	$3,099	$213.68	$191.80 - $242.64