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 September 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 |
|---|---|---|
| Aaron Wealth Advisors LLC | 1.2M | 52.8% |
| Candriam S.C.A. | 281.5K | 12.6% |
| DIMENSIONAL FUND ADVISORS LP | 232.4K | 10.4% |
| BARCLAYS PLC | 136.7K | 6.1% |
| Bank of New York Mellon Corp | 84.5K | 3.8% |
| ALPS ADVISORS INC | 63.8K | 2.9% |
| Sowell Financial Services LLC | 53.1K | 2.4% |
| Creative Planning | 43.7K | 2.0% |
| CITIGROUP INC | 30.8K | 1.4% |
| PROFUND ADVISORS LLC | 25.0K | 1.1% |
| EXCHANGE TRADED CONCEPTS, LLC | 20.5K | 0.9% |
| Koa Wealth Management, LLC | 15.6K | 0.7% |
| China Universal Asset Management Co., Ltd. | 11.8K | 0.5% |
| State of New Jersey Common Pension Fund D | 6.9K | 0.3% |
| STRS OHIO | 6.2K | 0.3% |
| ARIZONA STATE RETIREMENT SYSTEM | 6.0K | 0.3% |
| ProShare Advisors LLC | 5.6K | 0.3% |
| TEMA ETFS LLC | 5.0K | 0.2% |
| Pictet Asset Management Holding SA | 4.1K | 0.2% |
| PRINCIPAL FINANCIAL GROUP INC | 3.6K | 0.2% |
| Mirae Asset Global Investments Co., Ltd. | 2.5K | 0.1% |
| NISA INVESTMENT ADVISORS, LLC | 2.1K | 0.1% |
| SIMPLEX TRADING, LLC | 1.8K | 0.1% |
| LANARK FINANCIAL, INC. | 1.7K | 0.1% |
| GF FUND MANAGEMENT CO. LTD. | 1.0K | 0.0% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| Sowell Financial Services LLC | New | 0 | 53.1K | +53.1K |
| BARCLAYS PLC | Increased | 87.9K | 136.7K | +48.8K |
| PROFUND ADVISORS LLC | Increased | 8.8K | 25.0K | +16.2K |
| ALPS ADVISORS INC | Increased | 48.0K | 63.8K | +15.8K |
| Candriam S.C.A. | Reduced | 289.9K | 281.5K | -8.4K |
| Aaron Wealth Advisors LLC | Increased | 1.2M | 1.2M | +8.0K |
| EXCHANGE TRADED CONCEPTS, LLC | Reduced | 27.4K | 20.5K | -6.9K |
| CITIGROUP INC | Increased | 25.1K | 30.8K | +5.7K |
| Bank of New York Mellon Corp | Reduced | 88.9K | 84.5K | -4.4K |
| STRS OHIO | Increased | 2.0K | 6.2K | +4.2K |
| Creative Planning | Increased | 39.5K | 43.7K | +4.1K |
| Goelzer Investment Management, Inc. | Sold Out | 4.0K | 0 | -4.0K |
| PRINCIPAL FINANCIAL GROUP INC | New | 0 | 3.6K | +3.6K |
| China Universal Asset Management Co., Ltd. | Increased | 9.2K | 11.8K | +2.6K |
| LANARK FINANCIAL, INC. | New | 0 | 1.7K | +1.7K |
| Koa Wealth Management, LLC | Reduced | 17.1K | 15.6K | -1.5K |
| DIMENSIONAL FUND ADVISORS LP | Reduced | 233.7K | 232.4K | -1.3K |
| State of Wyoming | Sold Out | 1.1K | 0 | -1.1K |
| Sterling Capital Management LLC | Increased | 109 | 1.0K | +924 |
| Caitong International Asset Management Co., Ltd | New | 0 | 868 | +868 |
| SIMPLEX TRADING, LLC | Increased | 1.3K | 1.8K | +449 |
| Mirae Asset Global Investments Co., Ltd. | Increased | 2.1K | 2.5K | +332 |
| Nykredit A/S | New | 0 | 279 | +279 |
| Versant Capital Management, Inc | New | 0 | 180 | +180 |
| Larson Financial Group LLC | Increased | 49 | 199 | +150 |
| ARIZONA STATE RETIREMENT SYSTEM | Increased | 5.9K | 6.0K | +140 |
| GAMMA Investing LLC | Increased | 304 | 402 | +98 |
| Winthrop Capital Management, LLC | New | 0 | 98 | +98 |
| GF FUND MANAGEMENT CO. LTD. | Increased | 952 | 1.0K | +83 |
| Silver Grove Financial Group, Inc. | Increased | 13 | 72 | +59 |
| ProShare Advisors LLC | Reduced | 5.6K | 5.6K | -56 |
| NISA INVESTMENT ADVISORS, LLC | Increased | 2.0K | 2.1K | +49 |
| SIGNATUREFD, LLC | Increased | 78 | 121 | +43 |
| MassMutual Private Wealth & Trust, FSB | New | 0 | 40 | +40 |
| Parkside Financial Bank & Trust | New | 0 | 38 | +38 |
| Fortitude Family Office, LLC | Increased | 19 | 56 | +37 |
| J.Safra Asset Management Corp | Increased | 85 | 121 | +36 |
| TEMA ETFS LLC | Reduced | 5.0K | 5.0K | -33 |
| SBI Securities Co., Ltd. | New | 0 | 25 | +25 |
| Blue Trust, Inc. | New | 0 | 14 | +14 |
| EverSource Wealth Advisors, LLC | Increased | 48 | 61 | +13 |
| Parallel Advisors, LLC | Increased | 79 | 89 | +10 |
| PNC Financial Services Group, Inc. | Increased | 207 | 217 | +10 |
| Bell Investment Advisors, Inc | New | 0 | 9 | +9 |
| US BANCORP \DE\ | Reduced | 108 | 102 | -6 |
| Covestor Ltd | Reduced | 10 | 6 | -4 |
| Farther Finance Advisors, LLC | Increased | 9 | 13 | +4 |
| SJS Investment Consulting Inc. | Increased | 2 | 3 | +1 |
| Root Financial Partners, LLC | New | 0 | 1 | +1 |
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.