Who owns MBX Biosciences, Inc.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of MBX from SEC Form 13F filings across 172 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 172 institutions disclosed 55.5M shares of MBX Biosciences, Inc. worth $3.06B — about 116.3% of shares outstanding; the largest disclosed holder is Frazier Life Sciences Management, L.P.. Source: SEC Form 13F filings, parsed by EvidInvest.
172
13F holders
$3.06B
value, 2026 filers
116.3%
of shares outstanding (55.5M sh)
38
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of MBX's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | Frazier Life Sciences Management, L.P. | 6.7M | $367.2M | 8.0% | 13.9% | 0.0% |
| 2 | FMR LLC | 5.3M | $293.8M | 0.0% | 11.2% | +81.3% |
| 3 | WELLINGTON MANAGEMENT GROUP LLP | 5.0M | $274.8M | 0.0% | 10.4% | +55.9% |
| 4 | NEA Management Company, LLC | 3.6M | $199.5M | 12.6% | 7.6% | 0.0% |
| 5 | ORBIMED ADVISORS LLC | 3.4M | $189.3M | 3.5% | 7.2% | -5.7% |
| 6 | BlackRock, Inc. | 3.3M | $183.5M | 0.0% | 7% | +13.0% |
| 7 | Paradigm Biocapital Advisors LPNEW | 2.5M | $138.4M | 2.6% | 5.3% | new |
| 8 | NVP ASSOCIATES, LLC | 2.1M | $117.9M | 35.9% | 4.5% | 0.0% |
| 9 | Deep Track Capital, LP | 1.7M | $95.6M | 1.4% | 3.6% | -37.2% |
| 10 | Polar Capital Holdings Plc | 1.6M | $88.8M | 0.2% | 3.4% | -0.8% |
| 11 | VANGUARD CAPITAL MANAGEMENT LLC | 1.5M | $81.6M | 0.0% | 3.1% | 0.0% |
| 12 | Aaron Wealth Advisors LLC | 1.2M | $64.5M | 3.3% | 2.4% | 0.0% |
| 13 | Driehaus Capital Management LLC | 1.1M | $58.3M | 0.3% | 2.2% | +3.8% |
| 14 | Kynam Capital Management, LP | 934,799 | $51.6M | 2.9% | 2% | 0.0% |
| 15 | Woodline Partners LP | 900,092 | $49.7M | 0.2% | 1.9% | 0.0% |
| 16 | EVENTIDE ASSET MANAGEMENT, LLC | 873,492 | $48.2M | 0.6% | 1.8% | -1.9% |
| 17 | STATE STREET CORP | 864,466 | $47.7M | 0.0% | 1.8% | +9.8% |
| 18 | PRICE T ROWE ASSOCIATES INC /MD/ | 814,807 | $45.0M | 0.0% | 1.7% | -20.8% |
| 19 | Parkman Healthcare Partners LLC | 800,173 | $44.2M | 4.5% | 1.7% | 0.0% |
| 20 | GEODE CAPITAL MANAGEMENT, LLC | 773,072 | $42.7M | 0.0% | 1.6% | +15.3% |
| 21 | BRAIDWELL LP | 710,880 | $39.2M | 1.5% | 1.5% | -52.4% |
| 22 | TCG Crossover Management, LLC | 650,000 | $35.9M | 0.9% | 1.4% | 0.0% |
| 23 | Cormorant Asset Management, LP | 550,000 | $30.4M | 1.6% | 1.2% | -50.9% |
| 24 | Soleus Capital Management, L.P. | 515,279 | $28.4M | 1.0% | 1.1% | +188.0% |
| 25 | GOLDMAN SACHS GROUP INC | 459,005 | $25.3M | 0.0% | 1% | +0.2% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.