MBX Biosciences, Inc.
MBX- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001776111
In the last 90 days, MBX Biosciences, Inc. insiders filed 0 open-market purchases and 1 sale; 172 institutions reported holding it in 13F filings for Q2 2026, worth $3.06B in total; no superinvestor holds it.
13F holders, Q1 2026
Institutional positions in MBX Biosciences, Inc. as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 157
- +21 vs. Q4 2025
- Shares held
- 52.5M
- +5.92M (+12.7%) vs. Q4 2025
- Total value
- $1.57B
- +$98.0M (+6.7%) vs. Q4 2025
- New holders
- 39
- 43 more added
- Sold out
- 18
- 47 more reduced
2 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting MBX on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 172 | $3.06B |
| Q1 2026 | 157 | $1.57B |
| Q4 2025 | 138 | $1.53B |
| Q3 2025 | 118 | $836.4M |
| Q2 2025 | 88 | $420.3M |
| Q1 2025 | 79 | $263.2M |
| Q4 2024 | 63 | $606.5M |
| Q3 2024 | 45 | $784.1M |
| Q2 2024 | 0 | $0 |
| Q1 2024 | 0 | $0 |
| Q4 2023 | 0 | $0 |
| Q3 2023 | 0 | $0 |
| Q2 2023 | 0 | $0 |
| Q1 2023 | 0 | $0 |
| Q4 2022 | 0 | $0 |
| Q3 2022 | 0 | $0 |
| Q2 2022 | 0 | $0 |
| Q1 2022 | 0 | $0 |
| Q4 2021 | 0 | $0 |
| Q3 2021 | 0 | $0 |
| Q2 2021 | 0 | $0 |
| Q1 2021 | 0 | $0 |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding MBX Biosciences, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| ACT Capital Management, LLC | 9,000 | $268.6K | 0.21% | +9,000 | New |
| SEI Investments Co | 8,989 | $268.3K | 0.00% | +1,332+17.4% | Added |
| Toroso Investments, LLC | 8,877 | $265.0K | 0.00% | +8,877 | New |
| Tema ETFs LLC | 8,877 | $265.0K | 0.02% | +8,877 | New |
| Acadian Asset Management LLC | 8,823 | $262.0K | 0.00% | −39,791−81.9% | Reduced |
| American Century Companies Inc | 8,726 | $260.5K | 0.00% | −3,510−28.7% | Reduced |
| Profund Advisors LLC | 8,388 | $250.4K | 0.01% | −826−9.0% | Reduced |
| China Universal Asset Management Co., Ltd. | 7,968 | $237.8K | 0.02% | −7,349−48.0% | Reduced |
| Brinker Capital Investments, LLC | 7,951 | $237.3K | 0.00% | +7,951 | New |
| State of New Jersey Common Pension Fund D | 7,673 | $229.0K | 0.00% | +7,673 | New |
| Police & Firemen's Retirement System of New Jersey | 7,520 | $224.5K | 0.00% | 00.0% | Unchanged |
| Bridgeway Capital Management, LLC | 7,500 | $223.9K | 0.00% | −2,500−25.0% | Reduced |
| UBS Asset Management Americas Inc | 7,238 | $216.1K | 0.00% | +7,138+7,138.0% | Added |
| Intech Investment Management LLC | 6,844 | $204.3K | 0.00% | −14−0.2% | Reduced |
| Group One Trading, L.P. | 6,251 | $186.6K | 0.01% | −3,177−33.7% | Reduced |
| Vanguard Investments Australia, Ltd. | 6,103 | $182.2K | 0.00% | +6,103 | New |
| Los Angeles Capital Management LLC | 5,600 | $167.2K | 0.00% | −4,760−45.9% | Reduced |
| KLP Kapitalforvaltning AS | 4,900 | $146.3K | 0.00% | +4,900 | New |
| Russell Investments Group, Ltd. | 3,856 | $115.1K | 0.00% | +1,000+35.0% | Added |
| SG Americas Securities, LLC | 3,386 | $101.0K | 0.00% | −1,379−28.9% | Reduced |
| Rockefeller Capital Management L.P. | 3,224 | $96.2K | 0.00% | +224+7.5% | Added |
| Mirae Asset Global Investments Co., Ltd. | 2,342 | $69.9K | 0.00% | +160+7.3% | Added |
| Ameritas Investment Partners, Inc. | 2,312 | $69.0K | 0.00% | 00.0% | Unchanged |
| Cygnus Capital Advisors, LLC | 1,800 | $54.0K | 0.04% | 00.0% | Unchanged |
| CWM, LLC | 1,772 | $52.9K | 0.00% | −12−0.7% | Reduced |
| STRS Ohio | 1,600 | $47.8K | 0.00% | +900+128.6% | Added |
| Nisa Investment Advisors, LLC | 1,592 | $47.5K | 0.00% | 00.0% | Unchanged |
| Tower Research Capital LLC (TRC) | 1,411 | $42.1K | 0.00% | −2,005−58.7% | Reduced |
| Simplex Trading, LLC | 1,307 | $39.0K | 0.00% | −7,618−85.4% | Reduced |
| GF Fund Management Co. Ltd. | 1,009 | $30.1K | 0.00% | +127+14.4% | Added |
| Sterling Capital Management LLC | 949 | $28.3K | 0.00% | −692−42.2% | Reduced |
| KBC Group NV | 810 | $24.0K | 0.00% | +810 | New |
| Royal Bank of Canada | 751 | $22.0K | 0.00% | −781−51.0% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 470 | $14.0K | 0.00% | +470 | New |
| GAMMA Investing LLC | 299 | $8.93K | 0.00% | 00.0% | Unchanged |
| US Bancorp | 284 | $8.48K | 0.00% | −28−9.0% | Reduced |
| Advisor Group Holdings, Inc. | 269 | $8.03K | 0.00% | −77,332−99.7% | Reduced |
| The PNC Financial Services Group, Inc. | 207 | $6.18K | 0.00% | +11+5.6% | Added |
| Signaturefd, LLC | 179 | $5.34K | 0.00% | 00.0% | Unchanged |
| FIL Ltd | 178 | $5.31K | 0.00% | +178 | New |
| UMA Financial Services, Inc. | 109 | $3.25K | 0.00% | 00.0% | Unchanged |
| Jones Financial Companies LLLP | 80 | $2.28K | 0.00% | 00.0% | Unchanged |
| Allworth Financial LP | 70 | $2.09K | 0.00% | +18+34.6% | Added |
| Parallel Advisors, LLC | 61 | $1.82K | 0.00% | 00.0% | Unchanged |
| Larson Financial Group LLC | 49 | $1.46K | 0.00% | +49 | New |
| Cornerstone Financial Management LLC | 34 | $1.01K | 0.00% | 00.0% | Unchanged |
| EverSource Wealth Advisors, LLC | 25 | $746 | 0.00% | 00.0% | Unchanged |
| Rothschild Investment LLC | 24 | $716 | 0.00% | 00.0% | Unchanged |
| Versant Capital Management, Inc | 24 | $716 | 0.00% | +24 | New |
| Fortitude Family Office, LLC | 19 | $567 | 0.00% | +19 | New |
| Keating Financial Advisory Services, Inc. | 16 | $478 | 0.00% | +16 | New |
| Essential Partners LLC | 15 | $448 | 0.00% | 00.0% | Unchanged |
| Farther Finance Advisors, LLC | 9 | $291 | 0.00% | −1−10.0% | Reduced |
| MAI Capital Management | 7 | $209 | 0.00% | +7 | New |
| True Wealth Design, LLC | 2 | $60 | 0.00% | 00.0% | Unchanged |
| IFP Advisors, Inc | 1 | $30 | 0.00% | 00.0% | Unchanged |
| Covestor Ltd | 3 | $0 | 0.00% | +3 | New |
| Point72 Asset Management, L.P. | 0 | $0 | 0.00% | −680,609−100.0% | Sold out |
| Trails Edge Capital Partners, LP | 0 | $0 | 0.00% | −315,158−100.0% | Sold out |
| Balyasny Asset Management LLC | 0 | $0 | 0.00% | −119,726−100.0% | Sold out |
| Jane Street Group, LLC | 0 | $0 | 0.00% | −86,581−100.0% | Sold out |
| Renaissance Technologies LLC | 0 | $0 | 0.00% | −32,644−100.0% | Sold out |
| Brevan Howard Capital Management LP | 0 | $0 | 0.00% | −25,663−100.0% | Sold out |
| Trexquant Investment LP | 0 | $0 | 0.00% | −24,268−100.0% | Sold out |
| Fox Run Management, L.L.C. | 0 | $0 | 0.00% | −23,820−100.0% | Sold out |
| Gsa Capital Partners LLP | 0 | $0 | 0.00% | −19,295−100.0% | Sold out |
| Seven Fleet Capital Management LP | 0 | $0 | 0.00% | −18,200−100.0% | Sold out |
| Graham Capital Management, L.P. | 0 | $0 | 0.00% | −11,254−100.0% | Sold out |
| Rafferty Asset Management, LLC | 0 | $0 | 0.00% | −8,113−100.0% | Sold out |
| ProShare Advisors LLC | 0 | $0 | 0.00% | −7,187−100.0% | Sold out |
| Axq Capital, LP | 0 | $0 | 0.00% | −6,463−100.0% | Sold out |
| Amalgamated Bank | 0 | $0 | 0.00% | −895−100.0% | Sold out |
| Aster Capital Management (DIFC) Ltd | 0 | $0 | 0.00% | −265−100.0% | Sold out |
| Daiwa Securities Group Inc. | 0 | $0 | 0.00% | −150−100.0% | Sold out |
| SBI Securities Co., Ltd. | 0 | $0 | 0.00% | −9−100.0% | Sold out |
| Vanguard Group Inc | – | – | – | – | Not filed |
| Global Retirement Partners, LLC | – | – | – | – | Not filed |