BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

GILDER GAGNON HOWE & CO LLC's Holding History (CIK: 0000902464)

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

Q2 2024

Shares 57,031 Value ($000) $13,221 Avg Close $217.32 Range $189.44 - $237.54

Q1 2024

Shares 59,941 Value ($000) $12,925 Avg Close $234.20 Range $211.02 - $268.30

Q4 2023

Shares 68,479 Value ($000) $17,720 Avg Close $245.62 Range $220.86 - $269.43

Q3 2023

Shares 67,578 Value ($000) $17,368 Avg Close $267.47 Range $251.85 - $287.60

Q2 2023

Shares 80,297 Value ($000) $22,873 Avg Close $297.86 Range $273.39 - $319.76

Q1 2023

Shares 54,412 Value ($000) $15,128 Avg Close $276.70 Range $254.80 - $295.90

Q4 2022

Shares 56,541 Value ($000) $15,657 Avg Close $282.44 Range $250.31 - $311.88

Q2 2021

Shares 2,794 Value ($000) $967 Avg Close $302.94 Range $257.03 - $468.55

Q1 2021

Shares 6,428 Value ($000) $1,798 Avg Close $269.69 Range $238.40 - $296.38

Q3 2016

Shares 177 Value ($000) $55 Avg Close $296.18 Range $240.07 - $333.65

Q2 2015

Shares 1,062 Value ($000) $429 Avg Close $401.33 Range $368.88 - $432.88

Q1 2015

Shares 1,064 Value ($000) $449 Avg Close $394.14 Range $334.40 - $480.18

Q4 2014

Shares 82 Value ($000) $28 Avg Close $323.51 Range $290.85 - $361.93

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2024	57,031	$13,221	$217.32	$189.44 - $237.54
Q1 2024	59,941	$12,925	$234.20	$211.02 - $268.30
Q4 2023	68,479	$17,720	$245.62	$220.86 - $269.43
Q3 2023	67,578	$17,368	$267.47	$251.85 - $287.60
Q2 2023	80,297	$22,873	$297.86	$273.39 - $319.76
Q1 2023	54,412	$15,128	$276.70	$254.80 - $295.90
Q4 2022	56,541	$15,657	$282.44	$250.31 - $311.88
Q2 2021	2,794	$967	$302.94	$257.03 - $468.55
Q1 2021	6,428	$1,798	$269.69	$238.40 - $296.38
Q3 2016	177	$55	$296.18	$240.07 - $333.65
Q2 2015	1,062	$429	$401.33	$368.88 - $432.88
Q1 2015	1,064	$449	$394.14	$334.40 - $480.18
Q4 2014	82	$28	$323.51	$290.85 - $361.93