Institutional Holders (2026 Q2)
79 + investorsExplore institutional interest and hedge fund ownership dynamics. Analyze portfolio weights, new positions, and conviction trends in PBLS. Verified SEC 13F-HR filings.
| # | Investor | % of Portfolio | Shares | Mkt Value |
|---|---|---|---|---|
| 1 | Regeneron Pharmaceuticals, INC. | 64.35% | 4,166,666 | $114.0M |
| 2 | venBio Partners LLC | 27.75% | 5,266,697 | $144.1M |
| 3 | General Catalyst Group Management, LLC | 23.24% | 1,600,937 | $43.8M |
| 4 | ARCH Venture Management, LLC | 15.95% | 6,412,780 | $175.5M |
| 5 | Ra Capital Management, L.P. | 6.88% | 28,933,371 | $791.9M |
| 6 | Cormorant Asset Management, LP | 6.47% | 4,615,612 | $126.3M |
| 7 | Nextech Invest Ltd. | 6.06% | 4,663,176 | $127.6M |
| 8 | Foresite Capital Management VI LLC | 4.26% | 999,044 | $27.3M |
| 9 | Catalio Capital Management, LP | 4.24% | 824,043 | $22.6M |
| 10 | Siren, L.L.C. | 1.66% | 2,992,259 | $81.9M |
| 11 | General Atlantic, L.P. | 1.45% | 1,538,461 | $42.1M |
| 12 | Soleus Capital Management, L.P. | 1.38% | 1,465,070 | $40.1M |
| 13 | Samsara BioCapital, LLC | 1.25% | 556,044 | $15.2M |
| 14 | Frazier Life Sciences Management, L.P. | 1.14% | 1,920,805 | $52.6M |
| 15 | Casdin Capital, LLC | 0.88% | 645,690 | $17.7M |
| 16 | Rock Springs Capital Management LP | 0.77% | 578,028 | $15.8M |
| 17 | Logos Global Management LP | 0.62% | 525,000 | $14.4M |
| 18 | Deerfield Management Company, L.P. | 0.54% | 1,880,704 | $51.5M |
| 19 | Venrock Adviser, LLC | 0.52% | 625,000 | $17.1M |
| 20 | Kynam Capital Management, LP | 0.38% | 250,000 | $6.8M |
| 21 | Bellevue Group AG | 0.29% | 500,000 | $13.7M |
| 22 | ICONIQ Capital, LLC | 0.28% | 350,000 | $9.6M |
| 23 | Scientech Research LLC | 0.21% | 9,564 | $262K |
| 24 | Alphabet Inc. | 0.14% | 4,919,498 | $134.6M |
| 25 | Baker BROS. Advisors LP | 0.07% | 500,000 | $13.7M |
| Investor | Ownership History |
% of Portfolio | Prev % | Rank | Conviction | Avg Buy Price | 13F Score™ 3Y / 7Y | Sell Timing | Shares | Mkt Value | Change | Change % | Source | Quarter | Filed |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|