Shares outstanding · 2011–2025
Biogen shares outstanding
147M+0.3% · FY2025
Biogen (BIIB) reported 147M in shares outstanding for fiscal 2025, +0.3% year on year.
| Fiscal year | Shares outstanding | Change | Filing |
|---|---|---|---|
| FY20252026-02-04 | 147M | +0.3% | Open → |
| FY20242025-02-11 | 146M | +0.7% | Open → |
| FY20232024-02-12 | 145M | +0.6% | Open → |
| FY20222023-02-14 | 144M | −1.7% | Open → |
| FY20212022-02-02 | 147M | −3.5% | Open → |
| FY20202021-02-02 | 152M | −12.5% | Open → |
| FY20192020-02-04 | 174M | −11.5% | Open → |
| FY20182019-02-01 | 197M | −7.0% | Open → |
| FY20172018-01-26 | 212M | −2.0% | Open → |
| FY20162017-01-27 | 216M | −1.2% | Open → |
| FY20152016-01-29 | 219M | −6.8% | Open → |
| FY20142015-01-30 | 235M | −0.8% | Open → |
| FY20132014-01-31 | 236M | +0.0% | Open → |
| FY20122013-01-31 | 236M | −1.0% | Open → |
| FY20112012-01-31 | 239M | — | Open → |
Shares outstanding — Shares outstanding is the number of shares in issue at the reporting date. A falling count usually means the company is buying back stock; a rising one means it is issuing.
Every row links to its own SEC filing · Fiscal year 2025 · Data as of September 25, 2026 · 2011–2025 compound annual growth −3.4%
Shares outstanding at companies of similar size
Cite this page
Ready-made references for the figures on this page, as published on September 25, 2026.
Wikipedia
{{cite web |title=Biogen shares outstanding |url=https://companiesranked.com/en/company/biogen/shares-outstanding |website=CompaniesRanked |date=2026-09-25 |language=en}}APA 7
CompaniesRanked. (September 25, 2026). Biogen shares outstanding. CompaniesRanked. https://companiesranked.com/en/company/biogen/shares-outstandingBibTeX
@misc{companiesranked-en-company-biogen-shares-outstanding-2026,
author = {{CompaniesRanked}},
title = {{Biogen shares outstanding}},
year = {2026},
howpublished = {\url{https://companiesranked.com/en/company/biogen/shares-outstanding}},
note = {Compiled from SEC EDGAR XBRL filings; data as of 2026-09-25},
urldate = {2026-09-25}
}The filing itself
The numbers above are read from this document: 10-K · 0000875045-26-000013 · February 6, 2026
{{cite web |title=Biogen shares outstanding — 10-K (0000875045-26-000013) |url=https://www.sec.gov/Archives/edgar/data/875045/000087504526000013/biib-20251231.htm |website=SEC EDGAR |publisher=U.S. Securities and Exchange Commission |date=2026-02-06}}The figures are rebuilt with every data refresh, so the reference carries the publication date. Add your own access date if your style requires one.