BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS's Holding History (CIK: 0001083190)

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

Q4 2025

Shares 34,124 Value ($000) $6,005 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 35,208 Value ($000) $4,932 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 35,937 Value ($000) $4,513 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 33,474 Value ($000) $4,581 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 30,984 Value ($000) $4,738 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 31,709 Value ($000) $6,146 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 31,981 Value ($000) $7,414 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 31,809 Value ($000) $6,859 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 31,731 Value ($000) $8,211 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 29,119 Value ($000) $7,484 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 25,243 Value ($000) $7,190 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 24,412 Value ($000) $6,787 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 24,341 Value ($000) $7 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 21,226 Value ($000) $5,667 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 21,323 Value ($000) $4,349 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 19,655 Value ($000) $4,139 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 18,438 Value ($000) $4,424 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 18,676 Value ($000) $5,285 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 18,863 Value ($000) $6,532 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 19,052 Value ($000) $5,330 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 19,228 Value ($000) $4,708 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 14,668 Value ($000) $4,161 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 9,331 Value ($000) $2,497 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 11,528 Value ($000) $3,647 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 11,620 Value ($000) $3,448 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 11,819 Value ($000) $2,752 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 8,612 Value ($000) $2,014 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 11,500 Value ($000) $2,718 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 10,992 Value ($000) $3,308 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 16,531 Value ($000) $5,841 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 22,089 Value ($000) $6,411 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 18,931 Value ($000) $5,184 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 18,912 Value ($000) $6,025 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 17,195 Value ($000) $5,384 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 15,870 Value ($000) $4,306 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 16,015 Value ($000) $4,379 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 12,472 Value ($000) $3,537 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 12,515 Value ($000) $3,918 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 17,539 Value ($000) $4,241 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 16,227 Value ($000) $4,224 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 14,563 Value ($000) $4,461 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 15,110 Value ($000) $4,409 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 26,415 Value ($000) $10,670 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 26,915 Value ($000) $11,365 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 43,089 Value ($000) $14,627 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 43,308 Value ($000) $14,327 Avg Close $329.72 Range $298.31 - $349.00

Q2 2014

Shares 43,444 Value ($000) $13,698 Avg Close $300.97 Range $272.02 - $322.25

Q1 2014

Shares 45,291 Value ($000) $13,853 Avg Close $317.43 Range $270.62 - $358.89

Q4 2013

Shares 45,086 Value ($000) $12,605 Avg Close $258.65 Range $221.07 - $298.82

Q3 2013

Shares 48,540 Value ($000) $11,686 Avg Close $223.81 Range $203.55 - $248.95

Q2 2013

Shares 48,335 Value ($000) $10,402 Avg Close $213.68 Range $191.80 - $242.64

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	34,124	$6,005	$163.37	$138.00 - $185.17
Q3 2025	35,208	$4,932	$135.17	$121.05 - $150.28
Q2 2025	35,937	$4,513	$124.60	$110.04 - $137.32
Q1 2025	33,474	$4,581	$142.96	$128.51 - $157.09
Q4 2024	30,984	$4,738	$168.67	$145.07 - $195.00
Q3 2024	31,709	$6,146	$209.21	$188.78 - $238.00
Q2 2024	31,981	$7,414	$217.32	$189.44 - $237.54
Q1 2024	31,809	$6,859	$234.20	$211.02 - $268.30
Q4 2023	31,731	$8,211	$245.62	$220.86 - $269.43
Q3 2023	29,119	$7,484	$267.47	$251.85 - $287.60
Q2 2023	25,243	$7,190	$297.86	$273.39 - $319.76
Q1 2023	24,412	$6,787	$276.70	$254.80 - $295.90
Q4 2022	24,341	$7	$282.44	$250.31 - $311.88
Q3 2022	21,226	$5,667	$212.38	$193.65 - $283.44
Q2 2022	21,323	$4,349	$204.43	$187.16 - $225.50
Q1 2022	19,655	$4,139	$217.46	$192.67 - $249.00
Q4 2021	18,438	$4,424	$257.12	$221.72 - $290.76
Q3 2021	18,676	$5,285	$327.75	$282.64 - $372.12
Q2 2021	18,863	$6,532	$302.94	$257.03 - $468.55
Q1 2021	19,052	$5,330	$269.69	$238.40 - $296.38
Q4 2020	19,228	$4,708	$259.08	$223.25 - $363.92
Q3 2020	14,668	$4,161	$278.91	$261.87 - $312.00
Q2 2020	9,331	$2,497	$300.59	$257.60 - $350.24
Q1 2020	11,528	$3,647	$303.47	$262.25 - $374.99
Q4 2019	11,620	$3,448	$277.46	$219.70 - $318.00
Q3 2019	11,819	$2,752	$232.85	$215.78 - $246.99
Q2 2019	8,612	$2,014	$230.90	$219.20 - $245.35
Q1 2019	11,500	$2,718	$314.89	$216.12 - $344.00
Q4 2018	10,992	$3,308	$319.14	$278.46 - $358.41
Q3 2018	16,531	$5,841	$344.30	$288.13 - $388.67
Q2 2018	22,089	$6,411	$281.15	$249.17 - $310.91
Q1 2018	18,931	$5,184	$310.41	$259.76 - $370.57
Q4 2017	18,912	$6,025	$320.80	$301.81 - $348.84
Q3 2017	17,195	$5,384	$296.11	$269.50 - $330.00
Q2 2017	15,870	$4,306	$264.42	$244.28 - $291.90
Q1 2017	16,015	$4,379	$282.75	$260.50 - $301.42
Q4 2016	12,472	$3,537	$296.43	$268.00 - $329.83
Q3 2016	12,515	$3,918	$296.18	$240.07 - $333.65
Q2 2016	17,539	$4,241	$263.54	$223.02 - $292.69
Q1 2016	16,227	$4,224	$264.15	$242.07 - $301.02
Q4 2015	14,563	$4,461	$287.35	$254.00 - $311.65
Q3 2015	15,110	$4,409	$330.23	$265.00 - $412.24
Q2 2015	26,415	$10,670	$401.33	$368.88 - $432.88
Q1 2015	26,915	$11,365	$394.14	$334.40 - $480.18
Q4 2014	43,089	$14,627	$323.51	$290.85 - $361.93
Q3 2014	43,308	$14,327	$329.72	$298.31 - $349.00
Q2 2014	43,444	$13,698	$300.97	$272.02 - $322.25
Q1 2014	45,291	$13,853	$317.43	$270.62 - $358.89
Q4 2013	45,086	$12,605	$258.65	$221.07 - $298.82
Q3 2013	48,540	$11,686	$223.81	$203.55 - $248.95
Q2 2013	48,335	$10,402	$213.68	$191.80 - $242.64