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BIIB

SEC EDGAR filings — 10-K/Q, 8-K, Form 4 insider transactions, offerings, ownership reports.

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⚠️

Recent dilution risk

4 additional offering or shelf registration filings in the last 200 filings. Verify directly in SEC EDGAR before making any decisions.

424B2 2025-05-08 · 424B2FWP 2025-05-06 · FWP424B2 2025-05-06 · 424B2
AllFinancial (10-K/Q)Material (8-K)Offerings (S-1/S-3/424B)Insider (Form 4)Ownership (13D/G/F)

13 filings in material

  • 8-K
    8-K
    biib-20260406.htm· Items: 2.02
    2026-04-06
    9d ago
    202 KB ↗
  • 8-K
    8-K
    d14986d8k.htm· Items: 1.01,8.01,9.01
    2026-03-31
    15d ago
    5.3 MB ↗
  • 8-K
    CURRENT REPORT
    form8-k.htm· Items: 5.02
    2026-03-11
    1mo ago
    156 KB ↗
  • 8-K

Filings sourced directly from SEC EDGAR. Click any row to open the original document on sec.gov.

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8-K
d937279d8k.htm· Items: 5.02,8.01
2026-02-11
2mo ago
131 KB ↗
  • 8-K
    8-K
    biib-20260206.htm· Items: 2.02,9.01
    2026-02-06
    2mo ago
    781 KB ↗
  • 8-K
    8-K
    biib-20260113.htm· Items: 2.02
    2026-01-14
    3mo ago
    202 KB ↗
  • 8-K
    8-K
    biib-20251030.htm· Items: 2.02,9.01
    2025-10-30
    5mo ago
    770 KB ↗
  • 8-K
    8-K
    biib-20251014.htm· Items: 2.02,9.01
    2025-10-14
    6mo ago
    206 KB ↗
  • 8-K
    8-K
    biib-20250731.htm· Items: 2.02,9.01
    2025-07-31
    8mo ago
    739 KB ↗
  • 8-K
    8-K
    biib-20250707.htm· Items: 2.02,9.01
    2025-07-07
    9mo ago
    206 KB ↗
  • 8-K
    8-K
    biib-20250617.htm· Items: 5.07,9.01
    2025-06-23
    9mo ago
    234 KB ↗
  • 8-K
    8-K
    d13940d8k.htm· Items: 8.01,9.01
    2025-05-12
    11mo ago
    560 KB ↗
  • 8-K
    8-K
    biib-20250501.htm· Items: 2.02,9.01
    2025-05-01
    11mo ago
    582 KB ↗
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