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Biogen BIIB · USD

Health Care · Biotechnology · US listing · 🇺🇸 United States

S&P 500

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254.87

+2.63%

Close of 9 Nov 2026, in USD

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Reference data, closing prices and charts across 45,000 companies, plus crypto, commodities and currencies.

Largest shareholders

As filed, so dates differ, and a group and its funds can both appear.

HolderSharesStakeChangeFiled
The Vanguard Group, Inc.17.4m11.81%+156.5k31 Dec 2025
BLACKROCK, INC.16m10.86%+1.2m31 Mar 2026
PRIMECAP Management Company14.8m10.03%−196.7k31 Dec 2025
PRIMECAP MANAGEMENT CO/CA/14.8m10.03%−39031 Mar 2026
FMR LLC12.8m8.71%+3.4m31 Mar 2026
VANGUARD CAPITAL MANAGEMENT LLC9.5m6.48%+9.5m31 Mar 2026
BlackRock Institutional Trust Company, N.A.8.7m5.93%+513.3k31 Dec 2025
Fidelity Management & Research Company LLC8m5.42%+6.9m31 Dec 2025
STATE STREET CORP7.2m4.87%+8.9k31 Mar 2026
State Street Investment Management (US)7.2m4.87%−160.7k31 Dec 2025
VANGUARD PORTFOLIO MANAGEMENT LLC6.5m4.44%+6.5m31 Mar 2026
GEODE CAPITAL MANAGEMENT, LLC4.3m2.95%+143.2k31 Mar 2026
Geode Capital Management, L.L.C.4.2m2.85%+130.6k31 Dec 2025
Wellington Management Company, LLP3.6m2.41%−695.2k31 Dec 2025
WELLINGTON MANAGEMENT GROUP LLP3m2.01%−589.6k31 Mar 2026

Short interest

Shares sold short, 15 Oct 2026. US exchange data.

5.5m

-7.8% on the period before. 4.4 days to cover.

Short volume

Share of the day's trading sold short, 4 Nov 2026

50.4%

Last 60 trading days.

Failed deliveries

Shares not delivered on settlement, from the SEC

  • 28 Sept 202649,163 shares
  • 24 Sept 202658 shares
  • 23 Sept 2026300 shares
  • 22 Sept 2026187 shares
  • 21 Sept 202661 shares

Sources and methodology

Data on this tab
Our data supplier
Chart on the Overview
TradingView

Nothing here is investment advice. Prices can be delayed or wrong, so check with the exchange before relying on them. Data for this page. How we cover markets.