BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

Palo Alto Investors LP's Holding History (CIK: 0001306923)

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

Q4 2025

Shares 183,571 Value ($000) $32,307 Avg Close $163.37 Range $138.00 - $185.17

Q3 2025

Shares 185,661 Value ($000) $26,007 Avg Close $135.17 Range $121.05 - $150.28

Q2 2025

Shares 205,759 Value ($000) $25,841 Avg Close $124.60 Range $110.04 - $137.32

Q1 2025

Shares 204,923 Value ($000) $28,042 Avg Close $142.96 Range $128.51 - $157.09

Q4 2024

Shares 190,148 Value ($000) $29,077 Avg Close $168.67 Range $145.07 - $195.00

Q3 2024

Shares 228,916 Value ($000) $44,373 Avg Close $209.21 Range $188.78 - $238.00

Q2 2024

Shares 289,050 Value ($000) $67,008 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 289,958 Value ($000) $62,524 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 380,417 Value ($000) $98,441 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 381,282 Value ($000) $97,993 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 381,282 Value ($000) $108,608 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 381,282 Value ($000) $106,008 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 380,082 Value ($000) $105,252 Avg Close $282.44 Range $250.31 - $311.88

Q3 2022

Shares 360,981 Value ($000) $96,382 Avg Close $212.38 Range $193.65 - $283.44

Q2 2022

Shares 360,981 Value ($000) $73,618 Avg Close $204.43 Range $187.16 - $225.50

Q1 2022

Shares 360,981 Value ($000) $76,023 Avg Close $217.46 Range $192.67 - $249.00

Q4 2021

Shares 385,000 Value ($000) $92,369 Avg Close $257.12 Range $221.72 - $290.76

Q3 2021

Shares 361,600 Value ($000) $102,329 Avg Close $327.75 Range $282.64 - $372.12

Q2 2021

Shares 361,600 Value ($000) $125,211 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 343,200 Value ($000) $96,010 Avg Close $269.69 Range $238.40 - $296.38

Q4 2020

Shares 234,300 Value ($000) $57,371 Avg Close $259.08 Range $223.25 - $363.92

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	183,571	$32,307	$163.37	$138.00 - $185.17
Q3 2025	185,661	$26,007	$135.17	$121.05 - $150.28
Q2 2025	205,759	$25,841	$124.60	$110.04 - $137.32
Q1 2025	204,923	$28,042	$142.96	$128.51 - $157.09
Q4 2024	190,148	$29,077	$168.67	$145.07 - $195.00
Q3 2024	228,916	$44,373	$209.21	$188.78 - $238.00
Q2 2024	289,050	$67,008	$217.32	$189.44 - $237.54
Q1 2024	289,958	$62,524	$234.20	$211.02 - $268.30
Q4 2023	380,417	$98,441	$245.62	$220.86 - $269.43
Q3 2023	381,282	$97,993	$267.47	$251.85 - $287.60
Q2 2023	381,282	$108,608	$297.86	$273.39 - $319.76
Q1 2023	381,282	$106,008	$276.70	$254.80 - $295.90
Q4 2022	380,082	$105,252	$282.44	$250.31 - $311.88
Q3 2022	360,981	$96,382	$212.38	$193.65 - $283.44
Q2 2022	360,981	$73,618	$204.43	$187.16 - $225.50
Q1 2022	360,981	$76,023	$217.46	$192.67 - $249.00
Q4 2021	385,000	$92,369	$257.12	$221.72 - $290.76
Q3 2021	361,600	$102,329	$327.75	$282.64 - $372.12
Q2 2021	361,600	$125,211	$302.94	$257.03 - $468.55
Q1 2021	343,200	$96,010	$269.69	$238.40 - $296.38
Q4 2020	234,300	$57,371	$259.08	$223.25 - $363.92