MBX Biosciences, Inc. (MBX) Institutional Ownership & Insider Trading
173 institutions reported holding MBX Biosciences, Inc. shares in 13F filings for the quarter ended 2026-06-30, according to EquiReason's reading of their SEC filings. 8 insider trades on Form 4 since 2025-10-01.
Source: SEC EDGAR filings · figures as of 2026-06-30 · read by EquiReason
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- Market cap
- 2.3B
- P/E TTM
- —
- Dividend yield
- —
- 52-week
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- Next earnings
- 5 Nov, in 12 days
Institutions · all 13F filers
quarter to 30 Jun 2026 · filers in both quarters173 institutions held —% of the shares. Across filers that reported both quarters, shares held changed +4.6%.
Largest moves, shares (millions)
Institutional flow by quarter
net shares added or trimmed, millions · filers in both quarters| Quarter | Holders | Shares held, M | Change | Increased | New | Decreased | Closed |
|---|---|---|---|---|---|---|---|
| Jun 26 | 173 | 55 | +4.6% | 60 | 34 | 44 | 19 |
| Mar 26 | 157 | 53 | +9.5% | 41 | 33 | 43 | 18 |
| Dec 25 | 137 | 48 | -0.1% | 52 | 40 | 25 | 24 |
| Sep 25 | 115 | 48 | +29.7% | 29 | 37 | 28 | 9 |
| Jun 25 | 87 | 37 | +3.4% | 40 | 20 | 13 | 11 |
| Mar 25 | 79 | 36 | +8.4% | 22 | 26 | 12 | 8 |
| Dec 24 | 62 | 33 | +8.9% | 11 | 30 | 7 | 14 |
| Sep 24 | 44 | 30 | — | — | — | — | — |
MBX Biosciences, Inc. — questions
- Who owns MBX Biosciences, Inc. stock?
- 173 institutions reported MBX Biosciences, Inc. shares in 13F filings for the quarter ended 2026-06-30. The largest: Frazier Life Sciences Management, L.P. (13.8%), FMR LLC (11.1%), WELLINGTON MANAGEMENT GROUP LLP (10.3%).
- Are MBX Biosciences, Inc. insiders buying or selling?
- 8 insider trades on Form 4 since 2025-10-01; the full list, with dates, people and plan status, is on this page.
Every figure on this page comes from MBX Biosciences, Inc.'s own SEC filings — see them on SEC EDGAR. Price data is licensed and shown only inside the product.
How these figures are read: methodology · EquiReason.