PBLS (PBLS) Institutional Ownership Changes & 13F Activity
PBLS. Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q2 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Ra Capital Management, L.P., Arch Venture Management, Llc, Venbio Partners Llc, Nextech Invest, Ltd., and Cormorant Asset Management, Lp.
| Institution | Type | Change in shares | Change Position % | Shares | Reported stock balance | Portfolio quarter | Filing date |
|---|---|---|---|---|---|---|---|
| Cornerstone Financial Management Llc | Buy | +29 | — | 29 | $794.00 | Q2 2026 | Aug 28, 2026 |
| General Catalyst Group Management, Llc | Buy | +1,600,937 | — | 1,600,937 | $43.82M | Q2 2026 | Aug 17, 2026 |
| Ra Capital Management, L.P. | Buy | +28,933,371 | — | 28,933,371 | $791.91M | Q2 2026 | Aug 14, 2026 |
| Arch Venture Management, Llc | Buy | +6,412,780 | — | 6,412,780 | $175.52M | Q2 2026 | Aug 14, 2026 |
| Venbio Partners Llc | Buy | +5,266,697 | — | 5,266,697 | $144.15M | Q2 2026 | Aug 14, 2026 |
| Nextech Invest, Ltd. | Buy | +4,663,176 | — | 4,663,176 | $127.63M | Q2 2026 | Aug 14, 2026 |
| Cormorant Asset Management, Lp | Buy | +4,615,612 | — | 4,615,612 | $126.33M | Q2 2026 | Aug 14, 2026 |
| Farallon Capital Management Llc | Buy | +2,368,200 | — | 2,368,200 | $64.82M | Q2 2026 | Aug 14, 2026 |
| Frazier Life Sciences Management, L.P. | Buy | +1,920,805 | — | 1,920,805 | $52.57M | Q2 2026 | Aug 14, 2026 |
| Deerfield Management Company, L.P. | Buy | +1,880,704 | — | 1,880,704 | $51.47M | Q2 2026 | Aug 14, 2026 |
| General Atlantic, L.P. | Buy | +1,538,461 | — | 1,538,461 | $42.11M | Q2 2026 | Aug 14, 2026 |
| Foresite Capital Management Vi Llc | Buy | +999,044 | — | 999,044 | $27.34M | Q2 2026 | Aug 14, 2026 |
| Catalio Capital Management, Lp | Buy | +824,043 | — | 824,043 | $22.55M | Q2 2026 | Aug 14, 2026 |
| Alliancebernstein L.P. | Buy | +810,279 | — | 810,279 | $22.18M | Q2 2026 | Aug 14, 2026 |
| Price T Rowe Associates Inc | Buy | +751,947 | — | 751,947 | $20.58M | Q2 2026 | Aug 14, 2026 |
| Casdin Capital, Llc | Buy | +645,690 | — | 645,690 | $17.67M | Q2 2026 | Aug 14, 2026 |
| Venrock Adviser, Llc | Buy | +625,000 | — | 625,000 | $17.11M | Q2 2026 | Aug 14, 2026 |
| Rock Springs Capital Management Lp | Buy | +578,028 | — | 578,028 | $15.82M | Q2 2026 | Aug 14, 2026 |
| Samsara Biocapital, Llc | Buy | +556,044 | — | 556,044 | $15.22M | Q2 2026 | Aug 14, 2026 |
| Logos Global Management Lp | Buy | +525,000 | — | 525,000 | $14.37M | Q2 2026 | Aug 14, 2026 |
| Baker Bros. Advisors Lp | Buy | +500,000 | — | 500,000 | $13.69M | Q2 2026 | Aug 14, 2026 |
| Bellevue Group Ag | Buy | +500,000 | — | 500,000 | $13.69M | Q2 2026 | Aug 14, 2026 |
| Kynam Capital Management, Lp | Buy | +250,000 | — | 250,000 | $6.84M | Q2 2026 | Aug 14, 2026 |
| Ameriprise Financial Inc | Buy | +174,773 | — | 174,773 | $4.78M | Q2 2026 | Aug 14, 2026 |
| Driehaus Capital Management Llc | Buy | +100,000 | — | 100,000 | $2.74M | Q2 2026 | Aug 14, 2026 |
| Squarepoint Ops Llc | Buy | +48,484 | — | 48,484 | $1.33M | Q2 2026 | Aug 14, 2026 |
| Tudor Investment Corp Et Al | Buy | +44,045 | — | 44,045 | $1.21M | Q2 2026 | Aug 14, 2026 |
| Balyasny Asset Management L.P. | Buy | +24,264 | — | 24,264 | $664.11K | Q2 2026 | Aug 14, 2026 |
| Hudson Bay Capital Management Lp | Buy | +22,690 | — | 22,690 | $621.02K | Q2 2026 | Aug 14, 2026 |
| Brevan Howard Capital Management Lp | Buy | +22,565 | — | 22,565 | $617.60K | Q2 2026 | Aug 14, 2026 |
Frequently asked questions about PBLS activity
Which institutional owners are buying PBLS?
Institutional owners buying PBLS include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.
What does "buy" mean in PBLS activity?
"Buy" means an investor increased their reported position in PBLS compared to the prior reporting period. This reflects growing exposure to PBLS rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in PBLS increasing?
Institutional interest in PBLS can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.