Historical shareholding details of PRIMECAP Management Company holdings in Biogen Inc (BIIB)

Monthly changes of PRIMECAP Management Company shareholding in Biogen Inc over the previous months

Month Name Total no. shares held Percent Holding
Dec 31, 2024 Primecap Management Company 16,046,209 10.96%
Sep 30, 2024 Primecap Management Company 16,315,079 11.20%
Jun 30, 2024 Primecap Management Company 16,338,294 11.21%
Mar 31, 2024 Primecap Management Company 16,220,716 11.14%
Dec 31, 2023 Primecap Management Company 16,264,481 11.17%
Sep 30, 2023 Primecap Management Company 16,012,566 11.05%
Jun 30, 2023 Primecap Management Company 16,025,876 11.07%
Mar 31, 2023 Primecap Management Company 16,001,166 11.05%

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