MBX Biosciences
MBX · NASDAQ
$53.50+$1.02 (+1.94%)TodayMarket closed ·
Prev close $52.48
Who owns MBX
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 70.5% of MBX’s shares.
- Frazier Life Sciences Management, L.P.14.0%
- Wellington Management Company, LLP10.5%
- Fidelity Management & Research Company LLC10.2%
- New Enterprise Associates (NEA)7.6%
- Next 6 largest institutions28.3%
- All other shareholders29.5%
| Holder | Shares | % of shares |
|---|---|---|
| Frazier Life Sciences Management, L.P. | 6.65M | 13.97% |
| Wellington Management Company, LLP | 4.98M | 10.46% |
| Fidelity Management & Research Company LLC | 4.87M | 10.22% |
| New Enterprise Associates (NEA) | 3.61M | 7.59% |
| OrbiMed Advisors, LLC | 3.07M | 6.46% |
| Paradigm BioCapital Advisors LP | 2.51M | 5.27% |
| BlackRock Institutional Trust Company, N.A. | 2.41M | 5.06% |
| Norwest Venture Partners | 2.14M | 4.49% |
| Deep Track Capital LP | 1.73M | 3.64% |
| Polar Capital LLP | 1.61M | 3.38% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Polar Capital Biotechnology Fund | 1.52M | 3.20% |
| Vanguard Total Stock Market Index Fund | 1.14M | 2.39% |
| Eventide Healthcare & Life Sciences Fund | 890.00K | 1.87% |
| Fidelity Advisor Biotechnology Fund | 817.60K | 1.72% |
| iShares Russell 2000 ETF | 797.26K | 1.67% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $2.73M (5 trades) of MBX on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Azoulay Salomon | Sale | 370 | $24.33K |
| Smither John W | Award | 130.00K | — |
| Smither John W | Award | 28.00K | — |
| Hoerter Steven L. | Award | 331.00K | — |
| Hoerter Steven L. | Award | 71.00K | — |
| Ryder Steven | Award | 12.50K | — |
| Aynechi Tiba | Award | 12.50K | — |
| Stelzer Laurie | Award | 12.50K | — |
| Hoerter Steven L. | Award | 12.50K | — |
| Pescovitz Ora H. | Award | 12.50K | — |
Short interest
Settled Sep 30, 2026
- Shares short
- 4.47M
- Days to cover
- 6.84
- % of shares outstanding
- 9.38%
- Average daily volume
- 653.35K
- Change since last report
- +8.1%
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