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BIOGEN INC (BIIB)
Institutional ownership, SEC filings and insider activity
Sector: Healthcare & Pharma · SEC CIK 0000875045 · EDGAR filings · Updated 2026-07-01
BIOGEN INC (BIIB) has reported institutional ownership of 90.9%, with 995 institutional managers holding positions valued at $24.6B per the latest 13F reporting period.
Latest updates
- 2026-07-01 — Current report (8-K) filed
- 2026-06-11 — Insider transaction reported (Form 4)
- 2026-06-11 — Insider transaction reported (Form 4)
- 2026-06-11 — Insider transaction reported (Form 4)
- 2026-06-11 — Insider transaction reported (Form 4)
- 2026-06-11 — Insider transaction reported (Form 4)
- 2026-06-11 — Insider transaction reported (Form 4)
- 2026-06-11 — Insider transaction reported (Form 4)
Institutional ownership overview
According to SEC 13F filings tracked by Sightfile, BIOGEN INC has 995 institutional holders and institutional ownership of 90.9%.
| # | Institution | Reported value | % of tracked total |
|---|---|---|---|
| 1 | BlackRock, Inc. | $2.93B | 11.9% |
| 2 | PRIMECAP MANAGEMENT CO/CA/ | $2.71B | 11.0% |
| 3 | FMR LLC | $2.35B | 9.5% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | $1.75B | 7.1% |
| 5 | STATE STREET CORP | $1.31B | 5.3% |
| 6 | VANGUARD PORTFOLIO MANAGEMENT LLC | $1.20B | 4.9% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | $793.4M | 3.2% |
| 8 | WELLINGTON MANAGEMENT GROUP LLP | $543.0M | 2.2% |
| 9 | MORGAN STANLEY | $398.0M | 1.6% |
| 10 | JPMORGAN CHASE & CO | $378.1M | 1.5% |
Full holder history and quarter-over-quarter changes are available inside the app.
Insider activity
Insiders reported 80 transactions (2 buys, 5 sells) across 19 reporting insiders, with a net reported value of −$1.36M.
Quarterly net insider value, as reported in Form 4 filings.
Debt maturity schedule
Principal coming due by year for BIOGEN INC, from the company's own SEC prospectus filings (424B) tracked by Sightfile.
| Year | Bond series maturing | Known principal due |
|---|---|---|
| 2030 | 1 | — |
| 2031 | 1 | — |
| 2035 | 1 | — |
| 2045 | 1 | — |
| 2050 | 1 | — |
| 2051 | 1 | — |
| 2055 | 1 | — |
Coupons, seniority and prospectus links for each series are available inside the app.
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See full history, cross-references and alerts on SightfileData sources: SEC EDGAR (filings, 13F, FTD), aggregated by Sightfile. Page updated 2026-07-01.