Biogen (BIIB) Superinvestor holders
22 of the superinvestors we track hold Biogen (BIIB) in their latest 13F filings, $4.6B in total.
Summary
The largest holder is PRIMECAP Management (PRIMECAP Management Co), with $3.3B, 1.9% of the portfolio.
In their latest quarter: 3 opened a new position, 5 added, 12 trimmed.
Who holds it
Each investor's latest 13F filing, largest stake first. What a 13F shows.
| Investor | Last change | Shares | Value | % of portfolio | Filed for |
|---|---|---|---|---|---|
| PRIMECAP Management PRIMECAP Management Co |
Added | 15,154,606 | $3.3B | 1.9% | Q2 2026 |
| Cliff Asness AQR Capital Management |
Added | 1,936,859 | $417M | 0.1% | Q2 2026 |
| Mark Donovan Boston Partners |
Trimmed | 1,263,429 | $273M | 0.2% | Q2 2026 |
| Alger Fred Alger Management |
Added | 788,307 | $170M | 0.6% | Q2 2026 |
| Josef Lakonishok LSV Asset Management |
Trimmed | 438,072 | $99M | 0.2% | Q3 2026 |
| Ken Fisher Fisher Investments |
Added | 362,773 | $82M | 0.0% | Q3 2026 |
| Joel Greenblatt Gotham Asset Management |
Trimmed | 279,900 | $60M | 0.1% | Q2 2026 |
| Sarah Ketterer Causeway Capital Management |
Trimmed | 278,283 | $60M | 0.7% | Q2 2026 |
| Man Group Man Group plc |
Trimmed | 196,222 | $42M | 0.1% | Q2 2026 |
| Steve Cohen Point72 Asset Management |
Trimmed | 88,149 | $19M | 0.0% | Q2 2026 |
| Jim Simons Renaissance Technologies |
Trimmed | 77,744 | $17M | 0.0% | Q2 2026 |
| Acadian Acadian Asset Management |
Trimmed | 72,898 | $16M | 0.0% | Q3 2026 |
| David Shaw D. E. Shaw & Co. |
New position | 74,438 | $16M | 0.0% | Q2 2026 |
| Tom Steyer Farallon Capital Management LLC |
New position | 71,000 | $15M | 0.1% | Q2 2026 |
| Ensign Peak Ensign Peak Advisors |
Added | 37,354 | $8M | 0.0% | Q2 2026 |
| Paul Marshall Marshall Wace |
Trimmed | 12,595 | $3M | 0.0% | Q2 2026 |
| Two Sigma Two Sigma Investments |
Trimmed | 7,105 | $2M | 0.0% | Q2 2026 |
| Brandon Haley Holocene Advisors |
Held | 4,793 | $1M | 0.0% | Q2 2026 |
| Murray Stahl Horizon Kinetics LLC |
Trimmed | 2,726 | $588,980 | 0.0% | Q2 2026 |
| Fayez Sarofim Fayez Sarofim & Co |
Held | 2,300 | $496,938 | 0.0% | Q2 2026 |
| Alex Denner Sarissa Capital Management |
New position | 950 | $205,257 | 0.1% | Q2 2026 |
| Fred DiSanto Ancora Holdings |
Trimmed | 39 | $8,426 | 0.0% | Q2 2026 |
Holders by quarter
| Quarter | Superinvestors holding it |
|---|---|
| Q2 2026 | 22 |
| Q1 2026 | 22 |
| Q4 2025 | 23 |
| Q3 2025 | 23 |
| Q2 2025 | 22 |
| Q1 2025 | 22 |
| Q4 2024 | 24 |
| Q3 2024 | 22 |
Questions about Biogen
Which superinvestors own Biogen?
22 of the superinvestors we track hold Biogen (BIIB) in their latest 13F filings, $4.6B in total. PRIMECAP Management, Cliff Asness, Mark Donovan, Alger, Josef Lakonishok, Ken Fisher.
Who is the largest superinvestor holder of BIIB?
The largest holder is PRIMECAP Management (PRIMECAP Management Co), with $3.3B, 1.9% of the portfolio.
From Biogen's annual reports filed with the SEC (XBRL data), standardised by Investingly. Information only, not investment advice.