BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

TEACHER RETIREMENT SYSTEM OF TEXAS's Holding History (CIK: 0000796848)

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

Q4 2025

Shares 23,489 Value ($000) $4,134 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 37,793 Value ($000) $5,294 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 40,975 Value ($000) $5,146 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 39,872 Value ($000) $5,456 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 52,157 Value ($000) $8 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 39,392 Value ($000) $8 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 33,837 Value ($000) $8 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 32,946 Value ($000) $7 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 33,870 Value ($000) $9 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 38,312 Value ($000) $10 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 37,618 Value ($000) $11 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 33,695 Value ($000) $9 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 63,069 Value ($000) $17 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 22,678 Value ($000) $6,055 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 30,567 Value ($000) $6,234 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 38,177 Value ($000) $8,040 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 28,749 Value ($000) $6,897 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 27,667 Value ($000) $7,829 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 49,504 Value ($000) $17,142 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 48,386 Value ($000) $13,536 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 31,293 Value ($000) $7,662 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 161,130 Value ($000) $45,709 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 141,764 Value ($000) $37,929 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 110,213 Value ($000) $34,869 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 218,918 Value ($000) $64,960 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 125,983 Value ($000) $29,331 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 104,751 Value ($000) $24,498 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 106,727 Value ($000) $25,228 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 82,634 Value ($000) $24,866 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 91,721 Value ($000) $32,406 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 119,014 Value ($000) $34,543 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 78,603 Value ($000) $21,523 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 59,302 Value ($000) $18,892 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 186,680 Value ($000) $58,453 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 208,870 Value ($000) $56,679 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 209,378 Value ($000) $57,248 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 216,962 Value ($000) $61,526 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 227,852 Value ($000) $71,325 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 232,772 Value ($000) $56,289 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 264,281 Value ($000) $68,798 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 225,579 Value ($000) $69,106 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 232,574 Value ($000) $67,867 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 170,613 Value ($000) $68,917 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 10,742 Value ($000) $4,536 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 16,516 Value ($000) $5,606 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 9,550 Value ($000) $3,159 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 6,580 Value ($000) $2,075 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 4,048 Value ($000) $1,238 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 4,234 Value ($000) $1,184 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 8,736 Value ($000) $2,103 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 7,545 Value ($000) $1,624 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	23,489	$4,134	$163.37	$138.00 - $185.17
Q3 2025	37,793	$5,294	$135.17	$121.05 - $150.28
Q2 2025	40,975	$5,146	$124.60	$110.04 - $137.32
Q1 2025	39,872	$5,456	$142.96	$128.51 - $157.09
Q4 2024	52,157	$8	$168.67	$145.07 - $195.00
Q3 2024	39,392	$8	$209.21	$188.78 - $238.00
Q2 2024	33,837	$8	$217.32	$189.44 - $237.54
Q1 2024	32,946	$7	$234.20	$211.02 - $268.30
Q4 2023	33,870	$9	$245.62	$220.86 - $269.43
Q3 2023	38,312	$10	$267.47	$251.85 - $287.60
Q2 2023	37,618	$11	$297.86	$273.39 - $319.76
Q1 2023	33,695	$9	$276.70	$254.80 - $295.90
Q4 2022	63,069	$17	$282.44	$250.31 - $311.88
Q3 2022	22,678	$6,055	$212.38	$193.65 - $283.44
Q2 2022	30,567	$6,234	$204.43	$187.16 - $225.50
Q1 2022	38,177	$8,040	$217.46	$192.67 - $249.00
Q4 2021	28,749	$6,897	$257.12	$221.72 - $290.76
Q3 2021	27,667	$7,829	$327.75	$282.64 - $372.12
Q2 2021	49,504	$17,142	$302.94	$257.03 - $468.55
Q1 2021	48,386	$13,536	$269.69	$238.40 - $296.38
Q4 2020	31,293	$7,662	$259.08	$223.25 - $363.92
Q3 2020	161,130	$45,709	$278.91	$261.87 - $312.00
Q2 2020	141,764	$37,929	$300.59	$257.60 - $350.24
Q1 2020	110,213	$34,869	$303.47	$262.25 - $374.99
Q4 2019	218,918	$64,960	$277.46	$219.70 - $318.00
Q3 2019	125,983	$29,331	$232.85	$215.78 - $246.99
Q2 2019	104,751	$24,498	$230.90	$219.20 - $245.35
Q1 2019	106,727	$25,228	$314.89	$216.12 - $344.00
Q4 2018	82,634	$24,866	$319.14	$278.46 - $358.41
Q3 2018	91,721	$32,406	$344.30	$288.13 - $388.67
Q2 2018	119,014	$34,543	$281.15	$249.17 - $310.91
Q1 2018	78,603	$21,523	$310.41	$259.76 - $370.57
Q4 2017	59,302	$18,892	$320.80	$301.81 - $348.84
Q3 2017	186,680	$58,453	$296.11	$269.50 - $330.00
Q2 2017	208,870	$56,679	$264.42	$244.28 - $291.90
Q1 2017	209,378	$57,248	$282.75	$260.50 - $301.42
Q4 2016	216,962	$61,526	$296.43	$268.00 - $329.83
Q3 2016	227,852	$71,325	$296.18	$240.07 - $333.65
Q2 2016	232,772	$56,289	$263.54	$223.02 - $292.69
Q1 2016	264,281	$68,798	$264.15	$242.07 - $301.02
Q4 2015	225,579	$69,106	$287.35	$254.00 - $311.65
Q3 2015	232,574	$67,867	$330.23	$265.00 - $412.24
Q2 2015	170,613	$68,917	$401.33	$368.88 - $432.88
Q1 2015	10,742	$4,536	$394.14	$334.40 - $480.18
Q4 2014	16,516	$5,606	$323.51	$290.85 - $361.93
Q3 2014	9,550	$3,159	$329.72	$298.31 - $349.00
Q2 2014	6,580	$2,075	$300.97	$272.02 - $322.25
Q1 2014	4,048	$1,238	$317.43	$270.62 - $358.89
Q4 2013	4,234	$1,184	$258.65	$221.07 - $298.82
Q3 2013	8,736	$2,103	$223.81	$203.55 - $248.95
Q2 2013	7,545	$1,624	$213.68	$191.80 - $242.64