Who owns BIOGEN INC.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of BIIB from SEC Form 13F filings across 1,039 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 1,039 institutions disclosed 142.3M shares of BIOGEN INC. worth $33.19B — about 96.3% of shares outstanding; the largest disclosed holder is FMR LLC. Source: SEC Form 13F filings, parsed by EvidInvest.
1,039
13F holders
$33.19B
value, 2026 filers
96.3%
of shares outstanding (142.3M sh)
148
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of BIIB's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | FMR LLC | 18.2M | $3.94B | 0.2% | 12.3% | +42.2% |
| 2 | BlackRock, Inc. | 16.0M | $3.45B | 0.1% | 10.8% | +0.1% |
| 3 | PRIMECAP MANAGEMENT CO/CA/ | 15.2M | $3.27B | 1.9% | 10.3% | +2.7% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 9.7M | $2.09B | 0.0% | 6.5% | +1.2% |
| 5 | STATE STREET CORP | 7.3M | $1.59B | 0.0% | 5% | +2.5% |
| 6 | VANGUARD PORTFOLIO MANAGEMENT LLC | 6.6M | $1.43B | 0.1% | 4.5% | +1.1% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 4.4M | $957.9M | 0.1% | 3% | +2.5% |
| 8 | WELLINGTON MANAGEMENT GROUP LLP | 3.1M | $673.6M | 0.1% | 2.1% | +5.3% |
| 9 | NORGES BANKNEW | 2.6M | $557.4M | 0.1% | 1.7% | new |
| 10 | MORGAN STANLEY | 2.4M | $521.0M | 0.0% | 1.6% | +11.1% |
| 11 | AQR CAPITAL MANAGEMENT LLC | 1.9M | $416.9M | 0.1% | 1.3% | +0.7% |
| 12 | JPMORGAN CHASE & CO | 1.8M | $394.9M | 0.0% | 1.2% | -9.6% |
| 13 | Invesco Ltd. | 1.8M | $389.8M | 0.0% | 1.2% | +3.4% |
| 14 | Amundi | 1.5M | $327.7M | 0.1% | 1% | +91.8% |
| 15 | Legal & General Group Plc | 1.5M | $322.6M | 0.1% | 1% | +10.6% |
| 16 | NORTHERN TRUST CORP | 1.4M | $308.9M | 0.0% | 1% | -1.2% |
| 17 | Boston Partners | 1.3M | $272.8M | 0.2% | 0.9% | -25.7% |
| 18 | UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 1.3M | $271.2M | 0.0% | 0.8% | -8.9% |
| 19 | GOLDMAN SACHS GROUP INC | 1.2M | $265.8M | 0.0% | 0.8% | +17.1% |
| 20 | DIMENSIONAL FUND ADVISORS LP | 1.1M | $248.2M | 0.0% | 0.8% | +6.4% |
| 21 | Pacer Advisors, Inc.NEW | 1.1M | $242.6M | 0.6% | 0.8% | new |
| 22 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.1M | $241.5M | 0.0% | 0.8% | -2.8% |
| 23 | BANK OF AMERICA CORP /DE/ | 1.1M | $241.2M | 0.0% | 0.8% | -3.5% |
| 24 | UBS Group AG | 1.0M | $222.6M | 0.0% | 0.7% | +96.8% |
| 25 | Alyeska Investment Group, L.P. | 932,374 | $201.4M | 0.5% | 0.6% | +15.8% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.