BOLD Boundless Bio
Boundless Bio (BOLD) Institutional Ownership
What the institutions did with BOLD last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
Sign in or subscribeLargest holders
| Manager | Shares | % of reported |
|---|---|---|
| ARCH Venture Management, LLC | 2.7M | 17.6% |
| FMR LLC | 2.6M | 16.9% |
| TANG CAPITAL MANAGEMENT LLC | 2.6M | 16.7% |
| ADAR1 Capital Management, LLC | 2.0M | 12.9% |
| Cormorant Asset Management, LP | 1.0M | 6.5% |
| VANGUARD CAPITAL MANAGEMENT LLC | 614.9K | 4.0% |
| WELLINGTON MANAGEMENT GROUP LLP | 556.2K | 3.6% |
| MILLENNIUM MANAGEMENT LLC | 478.6K | 3.1% |
| RENAISSANCE TECHNOLOGIES LLC | 471.6K | 3.1% |
| Alyeska Investment Group, L.P. | 300.0K | 2.0% |
| Affinity Asset Advisors, LLC | 250.0K | 1.6% |
| RBF Capital, LLC | 200.0K | 1.3% |
| Ensign Peak Advisors, Inc | 159.8K | 1.0% |
| Stonepine Capital Management, LLC | 154.6K | 1.0% |
| ACADIAN ASSET MANAGEMENT LLC | 146.8K | 1.0% |
| CITADEL ADVISORS LLC | 145.0K | 0.9% |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 128.0K | 0.8% |
| GEODE CAPITAL MANAGEMENT, LLC | 116.7K | 0.8% |
| HRT FINANCIAL LP | 116.3K | 0.8% |
| BlackRock, Inc. | 88.5K | 0.6% |
| PRELUDE CAPITAL MANAGEMENT, LLC | 84.0K | 0.5% |
| Rangeley Capital, LLC | 74.0K | 0.5% |
| GSA CAPITAL PARTNERS LLP | 72.4K | 0.5% |
| VANGUARD FIDUCIARY TRUST CO | 65.1K | 0.4% |
| JANE STREET GROUP, LLC | 64.3K | 0.4% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| ARCH Venture Management, LLC | New | 0 | 2.7M | +2.7M |
| TANG CAPITAL MANAGEMENT LLC | New | 0 | 2.6M | +2.6M |
| ADAR1 Capital Management, LLC | New | 0 | 2.0M | +2.0M |
| CITADEL ADVISORS LLC | Reduced | 1.3M | 145.0K | -1.2M |
| Cormorant Asset Management, LP | New | 0 | 1.0M | +1.0M |
| SECTORAL ASSET MANAGEMENT INC | Sold Out | 678.6K | 0 | -678.6K |
| Stonepine Capital Management, LLC | Reduced | 597.7K | 154.6K | -443.1K |
| MILLENNIUM MANAGEMENT LLC | Increased | 99.9K | 478.6K | +378.8K |
| Affinity Asset Advisors, LLC | New | 0 | 250.0K | +250.0K |
| Sio Capital Management, LLC | Sold Out | 163.7K | 0 | -163.7K |
| ACADIAN ASSET MANAGEMENT LLC | Increased | 12.6K | 146.8K | +134.1K |
| HRT FINANCIAL LP | New | 0 | 116.3K | +116.3K |
| FMR LLC | Reduced | 2.7M | 2.6M | -114.4K |
| LANDSCAPE CAPITAL MANAGEMENT, L.L.C. | Sold Out | 85.8K | 0 | -85.8K |
| PRELUDE CAPITAL MANAGEMENT, LLC | New | 0 | 84.0K | +84.0K |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | Increased | 50.5K | 128.0K | +77.5K |
| Rangeley Capital, LLC | New | 0 | 74.0K | +74.0K |
| RENAISSANCE TECHNOLOGIES LLC | Increased | 399.0K | 471.6K | +72.6K |
| JANE STREET GROUP, LLC | New | 0 | 64.3K | +64.3K |
| SUPERSTRING CAPITAL MANAGEMENT LP | New | 0 | 55.4K | +55.4K |
| Walleye Capital LLC | Sold Out | 39.6K | 0 | -39.6K |
| NORTHERN TRUST CORP | New | 0 | 34.8K | +34.8K |
| Ensign Peak Advisors, Inc | Reduced | 187.5K | 159.8K | -27.7K |
| GSA CAPITAL PARTNERS LLP | Reduced | 96.8K | 72.4K | -24.5K |
| BlackRock, Inc. | Increased | 70.7K | 88.5K | +17.8K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.