BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

NEW YORK STATE TEACHERS RETIREMENT SYSTEM's Holding History (CIK: 0000314969)

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

Q4 2025

Shares 111,203 Value ($000) $20 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 110,194 Value ($000) $15 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 110,649 Value ($000) $14 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 107,676 Value ($000) $15 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 111,128 Value ($000) $17 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 117,801 Value ($000) $23 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 123,335 Value ($000) $29 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 126,819 Value ($000) $27 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 135,449 Value ($000) $35 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 143,058 Value ($000) $37 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 154,189 Value ($000) $44 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 162,091 Value ($000) $45 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 163,698 Value ($000) $45 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 162,897 Value ($000) $43,493 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 160,812 Value ($000) $32,796 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 164,807 Value ($000) $34,708 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 176,113 Value ($000) $42,253 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 183,123 Value ($000) $51,822 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 189,408 Value ($000) $65,586 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 201,040 Value ($000) $56,241 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 231,081 Value ($000) $56,582 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 248,764 Value ($000) $70,569 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 268,635 Value ($000) $71,873 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 292,929 Value ($000) $92,677 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 304,929 Value ($000) $90,482 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 311,829 Value ($000) $72,600 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 312,658 Value ($000) $73,121 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 330,715 Value ($000) $78,174 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 329,488 Value ($000) $99,150 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 346,581 Value ($000) $122,451 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 358,431 Value ($000) $104,031 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 368,741 Value ($000) $100,969 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 373,520 Value ($000) $118,992 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 376,420 Value ($000) $117,865 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 384,374 Value ($000) $104,304 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 390,344 Value ($000) $106,728 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 403,315 Value ($000) $114,372 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 408,176 Value ($000) $127,771 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 430,964 Value ($000) $104,216 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 434,490 Value ($000) $113,106 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 435,311 Value ($000) $133,358 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 451,091 Value ($000) $131,633 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 453,103 Value ($000) $183,026 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 455,983 Value ($000) $192,534 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 460,583 Value ($000) $156,345 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 468,580 Value ($000) $155,011 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 469,585 Value ($000) $148,065 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 485,019 Value ($000) $148,353 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 469,251 Value ($000) $131,189 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 486,312 Value ($000) $117,084 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 493,179 Value ($000) $106,132 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	111,203	$20	$163.37	$138.00 - $185.17
Q3 2025	110,194	$15	$135.17	$121.05 - $150.28
Q2 2025	110,649	$14	$124.60	$110.04 - $137.32
Q1 2025	107,676	$15	$142.96	$128.51 - $157.09
Q4 2024	111,128	$17	$168.67	$145.07 - $195.00
Q3 2024	117,801	$23	$209.21	$188.78 - $238.00
Q2 2024	123,335	$29	$217.32	$189.44 - $237.54
Q1 2024	126,819	$27	$234.20	$211.02 - $268.30
Q4 2023	135,449	$35	$245.62	$220.86 - $269.43
Q3 2023	143,058	$37	$267.47	$251.85 - $287.60
Q2 2023	154,189	$44	$297.86	$273.39 - $319.76
Q1 2023	162,091	$45	$276.70	$254.80 - $295.90
Q4 2022	163,698	$45	$282.44	$250.31 - $311.88
Q3 2022	162,897	$43,493	$212.38	$193.65 - $283.44
Q2 2022	160,812	$32,796	$204.43	$187.16 - $225.50
Q1 2022	164,807	$34,708	$217.46	$192.67 - $249.00
Q4 2021	176,113	$42,253	$257.12	$221.72 - $290.76
Q3 2021	183,123	$51,822	$327.75	$282.64 - $372.12
Q2 2021	189,408	$65,586	$302.94	$257.03 - $468.55
Q1 2021	201,040	$56,241	$269.69	$238.40 - $296.38
Q4 2020	231,081	$56,582	$259.08	$223.25 - $363.92
Q3 2020	248,764	$70,569	$278.91	$261.87 - $312.00
Q2 2020	268,635	$71,873	$300.59	$257.60 - $350.24
Q1 2020	292,929	$92,677	$303.47	$262.25 - $374.99
Q4 2019	304,929	$90,482	$277.46	$219.70 - $318.00
Q3 2019	311,829	$72,600	$232.85	$215.78 - $246.99
Q2 2019	312,658	$73,121	$230.90	$219.20 - $245.35
Q1 2019	330,715	$78,174	$314.89	$216.12 - $344.00
Q4 2018	329,488	$99,150	$319.14	$278.46 - $358.41
Q3 2018	346,581	$122,451	$344.30	$288.13 - $388.67
Q2 2018	358,431	$104,031	$281.15	$249.17 - $310.91
Q1 2018	368,741	$100,969	$310.41	$259.76 - $370.57
Q4 2017	373,520	$118,992	$320.80	$301.81 - $348.84
Q3 2017	376,420	$117,865	$296.11	$269.50 - $330.00
Q2 2017	384,374	$104,304	$264.42	$244.28 - $291.90
Q1 2017	390,344	$106,728	$282.75	$260.50 - $301.42
Q4 2016	403,315	$114,372	$296.43	$268.00 - $329.83
Q3 2016	408,176	$127,771	$296.18	$240.07 - $333.65
Q2 2016	430,964	$104,216	$263.54	$223.02 - $292.69
Q1 2016	434,490	$113,106	$264.15	$242.07 - $301.02
Q4 2015	435,311	$133,358	$287.35	$254.00 - $311.65
Q3 2015	451,091	$131,633	$330.23	$265.00 - $412.24
Q2 2015	453,103	$183,026	$401.33	$368.88 - $432.88
Q1 2015	455,983	$192,534	$394.14	$334.40 - $480.18
Q4 2014	460,583	$156,345	$323.51	$290.85 - $361.93
Q3 2014	468,580	$155,011	$329.72	$298.31 - $349.00
Q2 2014	469,585	$148,065	$300.97	$272.02 - $322.25
Q1 2014	485,019	$148,353	$317.43	$270.62 - $358.89
Q4 2013	469,251	$131,189	$258.65	$221.07 - $298.82
Q3 2013	486,312	$117,084	$223.81	$203.55 - $248.95
Q2 2013	493,179	$106,132	$213.68	$191.80 - $242.64