Who owns Biogen Inc.?
Institutional ownership of BIIB from SEC Form 13F filings across 598 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.
598
13F holders
$25.65B
value, 2026 filers
82.4%
of shares outstanding (120.9M sh)
63
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% | 12.4% | +42.2% |
| 2 | BlackRock, Inc. | 16.0M | $3.45B | 0.1% | 10.9% | +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% | 6.6% | -49.4% |
| 5 | VANGUARD PORTFOLIO MANAGEMENT LLC | 6.6M | $1.43B | 0.1% | 4.5% | +1.1% |
| 6 | GEODE CAPITAL MANAGEMENT, LLC | 4.4M | $957.9M | 0.1% | 3% | +2.5% |
| 7 | WELLINGTON MANAGEMENT GROUP LLP | 3.1M | $673.6M | 0.1% | 2.1% | +5.3% |
| 8 | NORGES BANKNEW | 2.6M | $557.4M | 0.1% | 1.8% | new |
| 9 | MORGAN STANLEY | 2.4M | $521.0M | 0.0% | 1.6% | +11.1% |
| 10 | JPMORGAN CHASE & CO | 1.8M | $394.9M | 0.0% | 1.2% | -9.6% |
| 11 | Invesco Ltd. | 1.8M | $389.8M | 0.0% | 1.2% | +3.4% |
| 12 | Amundi | 1.5M | $327.7M | 0.1% | 1% | +91.8% |
| 13 | Legal & General Group Plc | 1.5M | $322.6M | 0.1% | 1% | +10.6% |
| 14 | NORTHERN TRUST CORP | 1.4M | $308.9M | 0.0% | 1% | -1.2% |
| 15 | UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 1.3M | $271.2M | 0.0% | 0.9% | -8.9% |
| 16 | GOLDMAN SACHS GROUP INC | 1.2M | $265.8M | 0.0% | 0.8% | +17.1% |
| 17 | Sixth Street Partners Management Company, L.P.NEW | 1.1M | $241.5M | 41.7% | 0.8% | new |
| 18 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.1M | $241.5M | 0.0% | 0.8% | -2.8% |
| 19 | BANK OF AMERICA CORP /DE/ | 1.1M | $241.2M | 0.0% | 0.8% | -3.5% |
| 20 | UBS Group AG | 1.0M | $222.6M | 0.0% | 0.7% | +96.8% |
| 21 | DEUTSCHE BANK AG\ | 894,035 | $193.2M | 0.1% | 0.6% | -16.0% |
| 22 | Pictet Asset Management Holding SA | 851,819 | $184.1M | 0.2% | 0.6% | -6.7% |
| 23 | VANGUARD FIDUCIARY TRUST CO | 829,318 | $179.2M | 0.0% | 0.6% | +0.5% |
| 24 | Robeco Institutional Asset Management B.V. | 791,092 | $170.9M | 0.2% | 0.5% | +3.7% |
| 25 | FRED ALGER MANAGEMENT, LLC | 788,307 | $170.3M | 0.6% | 0.5% | +7.5% |
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.