BIOGEN INC

Ticker: BIIB CUSIP: 09062X103 Class: COM

Alyeska Investment Group, L.P.'s Holding History (CIK: 0001453072)

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

Q4 2025
Shares 1,024,268 Value ($000) $180,261 Avg Close $163.37 Range $138.00 - $185.17
Q3 2025
Shares 845,277 Value ($000) $118,406 Avg Close $135.17 Range $121.05 - $150.28
Q2 2025
Shares 508,773 Value ($000) $63,897 Avg Close $124.60 Range $110.04 - $137.32
Q2 2024
Shares 401,005 Value ($000) $92,961 Avg Close $217.32 Range $189.44 - $237.54
Q1 2024
Shares 166,693 Value ($000) $35,944 Avg Close $234.20 Range $211.02 - $268.30
Q4 2023
Shares 422,680 Value ($000) $109,377 Avg Close $245.62 Range $220.86 - $269.43
Q3 2023
Shares 442,076 Value ($000) $113,618 Avg Close $267.47 Range $251.85 - $287.60
Q2 2023
Shares 367,268 Value ($000) $104,616 Avg Close $297.86 Range $273.39 - $319.76
Q4 2022
Shares 25,064 Value ($000) $6,941 Avg Close $282.44 Range $250.31 - $311.88
Q2 2021
Shares 65,367 Value ($000) $22,635 Avg Close $302.94 Range $257.03 - $468.55
Q2 2017
Shares 149,507 Value ($000) $40,570 Avg Close $264.42 Range $244.28 - $291.90
Q3 2016
Shares 149,217 Value ($000) $46,709 Avg Close $296.18 Range $240.07 - $333.65
Q1 2016
Shares 23,381 Value ($000) $6,087 Avg Close $264.15 Range $242.07 - $301.02
Q4 2015
Shares 5,835 Value ($000) $1,788 Avg Close $287.35 Range $254.00 - $311.65
Q2 2015
Shares 7,500 Value ($000) $3,030 Avg Close $401.33 Range $368.88 - $432.88
Q2 2013
Shares 35,000 Value ($000) $7,532 Avg Close $213.68 Range $191.80 - $242.64