MBX MBX Biosciences, Inc.
MBX Biosciences, Inc. (MBX) Institutional Ownership
What the institutions did with MBX 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 |
|---|---|---|
| Frazier Life Sciences Management, L.P. | 6.7M | 12.0% |
| FMR LLC | 5.3M | 9.6% |
| WELLINGTON MANAGEMENT GROUP LLP | 5.0M | 9.0% |
| NEA Management Company, LLC | 3.6M | 6.5% |
| ORBIMED ADVISORS LLC | 3.4M | 6.2% |
| BlackRock, Inc. | 3.3M | 6.0% |
| Paradigm Biocapital Advisors LP | 2.5M | 4.5% |
| NVP ASSOCIATES, LLC | 2.1M | 3.9% |
| Deep Track Capital, LP | 1.7M | 3.1% |
| Polar Capital Holdings Plc | 1.6M | 2.9% |
| VANGUARD CAPITAL MANAGEMENT LLC | 1.5M | 2.7% |
| Aaron Wealth Advisors LLC | 1.2M | 2.1% |
| Driehaus Capital Management LLC | 1.1M | 1.9% |
| Kynam Capital Management, LP | 934.8K | 1.7% |
| Woodline Partners LP | 900.1K | 1.6% |
| EVENTIDE ASSET MANAGEMENT, LLC | 873.5K | 1.6% |
| STATE STREET CORP | 864.5K | 1.6% |
| PRICE T ROWE ASSOCIATES INC /MD/ | 814.8K | 1.5% |
| Parkman Healthcare Partners LLC | 800.2K | 1.4% |
| GEODE CAPITAL MANAGEMENT, LLC | 773.1K | 1.4% |
| BRAIDWELL LP | 710.9K | 1.3% |
| TCG Crossover Management, LLC | 650.0K | 1.2% |
| Cormorant Asset Management, LP | 550.0K | 1.0% |
| Soleus Capital Management, L.P. | 515.3K | 0.9% |
| GOLDMAN SACHS GROUP INC | 459.0K | 0.8% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| Paradigm Biocapital Advisors LP | New | 0 | 2.5M | +2.5M |
| FMR LLC | Increased | 2.9M | 5.3M | +2.4M |
| WELLINGTON MANAGEMENT GROUP LLP | Increased | 3.2M | 5.0M | +1.8M |
| Deep Track Capital, LP | Reduced | 2.8M | 1.7M | -1.0M |
| STEMPOINT CAPITAL LP | Sold Out | 998.9K | 0 | -998.9K |
| CITADEL ADVISORS LLC | Sold Out | 932.8K | 0 | -932.8K |
| BRAIDWELL LP | Reduced | 1.5M | 710.9K | -781.6K |
| Caligan Partners LP | Reduced | 848.6K | 200.0K | -648.6K |
| Cormorant Asset Management, LP | Reduced | 1.1M | 550.0K | -570.0K |
| EcoR1 Capital, LLC | Reduced | 777.0K | 388.5K | -388.5K |
| BlackRock, Inc. | Increased | 2.9M | 3.3M | +382.3K |
| MARSHALL WACE, LLP | Increased | 62.7K | 401.9K | +339.2K |
| MILLENNIUM MANAGEMENT LLC | Reduced | 564.4K | 226.2K | -338.3K |
| Soleus Capital Management, L.P. | Increased | 178.9K | 515.3K | +336.4K |
| BANK OF AMERICA CORP /DE/ | Increased | 28.8K | 298.9K | +270.2K |
| FRANKLIN RESOURCES INC | New | 0 | 252.7K | +252.7K |
| MORGAN STANLEY | Increased | 31.6K | 248.6K | +217.0K |
| PRICE T ROWE ASSOCIATES INC /MD/ | Reduced | 1.0M | 814.8K | -214.2K |
| ORBIMED ADVISORS LLC | Reduced | 3.6M | 3.4M | -209.2K |
| DIMENSIONAL FUND ADVISORS LP | Increased | 46.8K | 233.7K | +186.9K |
| DAFNA Capital Management LLC | Reduced | 175.5K | 11.8K | -163.7K |
| Goelzer Investment Management, Inc. | Reduced | 164.2K | 4.0K | -160.2K |
| BOOTHBAY FUND MANAGEMENT, LLC | Reduced | 208.0K | 70.4K | -137.7K |
| Schonfeld Strategic Advisors LLC | Increased | 123.8K | 248.7K | +124.9K |
| Elmind Capital, LP | Reduced | 211.0K | 91.0K | -120.0K |
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.