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Biogen Inc.
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Holders

Fund holders

Name Date reported Shares Value % Held
VANGUARD CHESTER FUNDS-Vanguard PRIMECAP Fund Dec 31, 2025 8.4M 1.3B 5.7%
VANGUARD INDEX FUNDS-Vanguard Total Stock Market Index Fund Dec 31, 2025 4.6M 719.4M 3.2%
VANGUARD INDEX FUNDS-Vanguard 500 Index Fund Dec 31, 2025 3.7M 575.5M 2.5%
VANGUARD INDEX FUNDS-Vanguard Mid-Cap Index Fund Dec 31, 2025 3.2M 496.7M 2.2%
Fidelity Contrafund Feb 28, 2026 3.1M 475.7M 2.1%
VANGUARD SPECIALIZED FUNDS-Vanguard Health Care Fund Jan 31, 2026 2.9M 453.2M 2.0%
VANGUARD HORIZON FUNDS-Vanguard Capital Opportunity Fund Dec 31, 2025 2.3M 362.8M 1.6%
iShares Trust-iShares Core S&P 500 ETF Jan 31, 2026 1.9M 293.6M 1.3%
Fidelity Concord Street Trust-Fidelity 500 Index Fund Feb 28, 2026 1.9M 290.4M 1.3%
SPDR S&P 500 ETF TRUST-State Street SPDR S&P 500 ETF Trust Jan 31, 2026 1.8M 274.2M 1.2%
Access Holders data via our API — starting from the Ultra plan (individual) and the Enterprise plan (business) and above.
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Trading Hours (Monday - Friday):

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