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.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest 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 |
| D. E. Shaw & Co., Inc. | Reduced | 288.9K | 182.8K | -106.1K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 670.4K | 773.1K | +102.7K |
| Squarepoint Ops LLC | Sold Out | 97.2K | 0 | -97.2K |
| PRUDENTIAL FINANCIAL INC | New | 0 | 88.0K | +88.0K |
| STATE STREET CORP | Increased | 787.2K | 864.5K | +77.3K |
| BARCLAYS PLC | Increased | 11.8K | 87.9K | +76.0K |
| Affinity Asset Advisors, LLC | Reduced | 150.0K | 75.0K | -75.0K |
| UBS Group AG | Reduced | 346.9K | 272.7K | -74.2K |
| VICTORY CAPITAL MANAGEMENT INC | Sold Out | 71.0K | 0 | -71.0K |
| MOORE CAPITAL MANAGEMENT, LP | New | 0 | 64.9K | +64.9K |
| Rhenman & Partners Asset Management AB | New | 0 | 62.0K | +62.0K |
| Tetragon Partners GP Ltd | Increased | 145.5K | 203.5K | +58.1K |
| SCHRODER INVESTMENT MANAGEMENT GROUP | Sold Out | 57.3K | 0 | -57.3K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 293.3K | 346.7K | +53.4K |
| XTX Topco Ltd | Reduced | 53.2K | 6.4K | -46.8K |
| Ensign Peak Advisors, Inc | New | 0 | 42.2K | +42.2K |
| Driehaus Capital Management LLC | Increased | 1.0M | 1.1M | +38.4K |
| NORTHERN TRUST CORP | Increased | 210.6K | 246.7K | +36.1K |
| VANGUARD FIDUCIARY TRUST CO | Increased | 170.2K | 201.4K | +31.3K |
| ExodusPoint Capital Management, LP | Sold Out | 28.1K | 0 | -28.1K |
| VOYA INVESTMENT MANAGEMENT LLC | New | 0 | 26.1K | +26.1K |
| Universal- Beteiligungs- und Servicegesellschaft mbH | New | 0 | 25.8K | +25.8K |
| TEACHERS RETIREMENT SYSTEM OF THE STATE OF KENTUCKY | New | 0 | 25.4K | +25.4K |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | Reduced | 90.6K | 66.1K | -24.5K |
| Invesco Ltd. | Increased | 27.5K | 50.7K | +23.2K |
| TD Asset Management Inc | Reduced | 116.0K | 95.6K | -20.4K |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | Increased | 214.9K | 233.1K | +18.2K |
| WELLS FARGO & COMPANY/MN | Increased | 10.8K | 28.3K | +17.6K |
| Engineers Gate Manager LP | Sold Out | 17.4K | 0 | -17.4K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 9.5K | 26.7K | +17.2K |
| Qube Research & Technologies Ltd | Sold Out | 17.2K | 0 | -17.2K |
| Nuveen, LLC | Increased | 81.8K | 98.7K | +16.9K |
| EVENTIDE ASSET MANAGEMENT, LLC | Reduced | 890.0K | 873.5K | -16.5K |
| Russell Investments Group, Ltd. | Increased | 3.9K | 18.2K | +14.3K |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | Increased | 7.2K | 21.3K | +14.1K |
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.