BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

National Pension Service's Holding History (CIK: 0001608046)

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

Q4 2025

Shares 287,238 Value ($000) $50,551 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 285,202 Value ($000) $39,951 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 273,055 Value ($000) $34,293 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 271,483 Value ($000) $37,150 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 250,085 Value ($000) $38,243 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 359,569 Value ($000) $69,699 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 326,655 Value ($000) $75,725 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 314,116 Value ($000) $67,733 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 302,317 Value ($000) $78,231 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 295,942 Value ($000) $76,368 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 281,212 Value ($000) $79,338 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 267,331 Value ($000) $73,551 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 199,525 Value ($000) $55,252 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 205,652 Value ($000) $54,350 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 214,014 Value ($000) $43,646 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 211,211 Value ($000) $44,481 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 246,441 Value ($000) $59,126 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 247,492 Value ($000) $70,038 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 253,622 Value ($000) $87,822 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 249,022 Value ($000) $69,664 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 254,748 Value ($000) $62,378 Avg Close $259.08 Range $223.25 - $363.92

Q3 2020

Shares 249,787 Value ($000) $70,449 Avg Close $278.91 Range $261.87 - $312.00

Q2 2020

Shares 249,787 Value ($000) $66,831 Avg Close $300.59 Range $257.60 - $350.24

Q1 2020

Shares 257,333 Value ($000) $81,415 Avg Close $303.47 Range $262.25 - $374.99

Q4 2019

Shares 254,305 Value ($000) $75,460 Avg Close $277.46 Range $219.70 - $318.00

Q3 2019

Shares 255,459 Value ($000) $59,476 Avg Close $232.85 Range $215.78 - $246.99

Q2 2019

Shares 244,198 Value ($000) $57,111 Avg Close $230.90 Range $219.20 - $245.35

Q1 2019

Shares 213,048 Value ($000) $50,360 Avg Close $314.89 Range $216.12 - $344.00

Q4 2018

Shares 205,127 Value ($000) $66,607 Avg Close $319.14 Range $278.46 - $358.41

Q3 2018

Shares 193,693 Value ($000) $68,434 Avg Close $344.30 Range $288.13 - $388.67

Q2 2018

Shares 194,664 Value ($000) $56,209 Avg Close $281.15 Range $249.17 - $310.91

Q1 2018

Shares 182,894 Value ($000) $50,080 Avg Close $310.41 Range $259.76 - $370.57

Q4 2017

Shares 178,319 Value ($000) $56,807 Avg Close $320.80 Range $301.81 - $348.84

Q3 2017

Shares 176,523 Value ($000) $54,722 Avg Close $296.11 Range $269.50 - $330.00

Q2 2017

Shares 169,385 Value ($000) $46,052 Avg Close $264.42 Range $244.28 - $291.90

Q1 2017

Shares 155,521 Value ($000) $41,844 Avg Close $282.75 Range $260.50 - $301.42

Q4 2016

Shares 154,517 Value ($000) $43,818 Avg Close $296.43 Range $268.00 - $329.83

Q3 2016

Shares 141,862 Value ($000) $44,407 Avg Close $296.18 Range $240.07 - $333.65

Q2 2016

Shares 130,485 Value ($000) $31,554 Avg Close $263.54 Range $223.02 - $292.69

Q1 2016

Shares 119,510 Value ($000) $31,111 Avg Close $264.15 Range $242.07 - $301.02

Q4 2015

Shares 114,597 Value ($000) $35,107 Avg Close $287.35 Range $254.00 - $311.65

Q3 2015

Shares 107,547 Value ($000) $31,383 Avg Close $330.23 Range $265.00 - $412.24

Q2 2015

Shares 94,110 Value ($000) $38,014 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 81,009 Value ($000) $34,205 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 70,319 Value ($000) $23,870 Avg Close $323.51 Range $290.85 - $361.93

Q3 2014

Shares 77,028 Value ($000) $25,482 Avg Close $329.72 Range $298.31 - $349.00

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	287,238	$50,551	$163.37	$138.00 - $185.17
Q3 2025	285,202	$39,951	$135.17	$121.05 - $150.28
Q2 2025	273,055	$34,293	$124.60	$110.04 - $137.32
Q1 2025	271,483	$37,150	$142.96	$128.51 - $157.09
Q4 2024	250,085	$38,243	$168.67	$145.07 - $195.00
Q3 2024	359,569	$69,699	$209.21	$188.78 - $238.00
Q2 2024	326,655	$75,725	$217.32	$189.44 - $237.54
Q1 2024	314,116	$67,733	$234.20	$211.02 - $268.30
Q4 2023	302,317	$78,231	$245.62	$220.86 - $269.43
Q3 2023	295,942	$76,368	$267.47	$251.85 - $287.60
Q2 2023	281,212	$79,338	$297.86	$273.39 - $319.76
Q1 2023	267,331	$73,551	$276.70	$254.80 - $295.90
Q4 2022	199,525	$55,252	$282.44	$250.31 - $311.88
Q3 2022	205,652	$54,350	$212.38	$193.65 - $283.44
Q2 2022	214,014	$43,646	$204.43	$187.16 - $225.50
Q1 2022	211,211	$44,481	$217.46	$192.67 - $249.00
Q4 2021	246,441	$59,126	$257.12	$221.72 - $290.76
Q3 2021	247,492	$70,038	$327.75	$282.64 - $372.12
Q2 2021	253,622	$87,822	$302.94	$257.03 - $468.55
Q1 2021	249,022	$69,664	$269.69	$238.40 - $296.38
Q4 2020	254,748	$62,378	$259.08	$223.25 - $363.92
Q3 2020	249,787	$70,449	$278.91	$261.87 - $312.00
Q2 2020	249,787	$66,831	$300.59	$257.60 - $350.24
Q1 2020	257,333	$81,415	$303.47	$262.25 - $374.99
Q4 2019	254,305	$75,460	$277.46	$219.70 - $318.00
Q3 2019	255,459	$59,476	$232.85	$215.78 - $246.99
Q2 2019	244,198	$57,111	$230.90	$219.20 - $245.35
Q1 2019	213,048	$50,360	$314.89	$216.12 - $344.00
Q4 2018	205,127	$66,607	$319.14	$278.46 - $358.41
Q3 2018	193,693	$68,434	$344.30	$288.13 - $388.67
Q2 2018	194,664	$56,209	$281.15	$249.17 - $310.91
Q1 2018	182,894	$50,080	$310.41	$259.76 - $370.57
Q4 2017	178,319	$56,807	$320.80	$301.81 - $348.84
Q3 2017	176,523	$54,722	$296.11	$269.50 - $330.00
Q2 2017	169,385	$46,052	$264.42	$244.28 - $291.90
Q1 2017	155,521	$41,844	$282.75	$260.50 - $301.42
Q4 2016	154,517	$43,818	$296.43	$268.00 - $329.83
Q3 2016	141,862	$44,407	$296.18	$240.07 - $333.65
Q2 2016	130,485	$31,554	$263.54	$223.02 - $292.69
Q1 2016	119,510	$31,111	$264.15	$242.07 - $301.02
Q4 2015	114,597	$35,107	$287.35	$254.00 - $311.65
Q3 2015	107,547	$31,383	$330.23	$265.00 - $412.24
Q2 2015	94,110	$38,014	$401.33	$368.88 - $432.88
Q1 2015	81,009	$34,205	$394.14	$334.40 - $480.18
Q4 2014	70,319	$23,870	$323.51	$290.85 - $361.93
Q3 2014	77,028	$25,482	$329.72	$298.31 - $349.00