MBX Biosciences, Inc. Common Stock (MBX) short interest & short volume · 4.4M shares short
MBX Biosciences, Inc. Common Stock official short interest (FINRA, twice monthly) and daily short volume (FINRA Reg SHO), with history, % of float and days to cover.
What changed
MBX short interest was little changed at 4.4M shares in the Oct 15, 2026 report (7.5 days to cover). Daily short volume averaged 59.9% of volume over the last 20 sessions, down from 62.4% the 20 sessions before, the 61st percentile of its own 20-day averages since Sep 23, 2025.
Short interest
Official, twice monthly · settled Oct 15, 2026
- Shares short
- 4.4M
- prior 4.5M
- % of float
- —
- no float on file
- Days to cover
- 7.5
- avg vol 593K
- Change vs prior report
- -1.0%
Days to cover is short interest divided by FINRA's average daily volume for the period: how many average days of trading it would take shorts to buy back.
Source: FINRA equity short interest (twice monthly) · Settlement Oct 15, 2026
Daily short volume
Share of each day's volume sold short · FINRA Reg SHO
- Latest (Nov 2)
- 81.1%
- 85K of 105K
- 20-day average
- 59.9%
- prior 62.4%
- Percentile vs own history
- 61st
- 233 periods since 2025
Loading prices…
Source: FINRA Reg SHO daily short sale volume · Latest Nov 2, 2026
Short squeeze score (model)
Price since settlement: +8.5%
Model, not a forecast: 40 pts short interest % of float (full at 30%), 25 pts days to cover (full at 10), 15 pts rise in short interest since the prior report (full at +50%), 20 pts price gain since the settlement date (full at +25%). Missing inputs score 0.
MBX's squeeze score and its inputs with Lician Pro.Start 3-day trial — $149/yr
Market-wide: most shorted stocks, biggest changes and unusual short volume · MBX overview
| Date | Short | Total | Short % of volume |
|---|---|---|---|
| 2026-11-02 | 85,271 | 105,151 | 81.1% |
| 2026-10-30 | 210,480 | 320,996 | 65.6% |
| 2026-10-29 | 68,258 | 102,769 | 66.4% |
| 2026-10-28 | 88,435 | 108,032 | 81.9% |
| 2026-10-27 | 98,840 | 275,526 | 35.9% |
| 2026-10-26 | 175,531 | 397,954 | 44.1% |
| 2026-10-23 | 114,099 | 235,946 | 48.4% |
| 2026-10-22 | 109,702 | 282,169 | 38.9% |
| 2026-10-21 | 136,827 | 161,571 | 84.7% |
| 2026-10-20 | 111,438 | 497,341 | 22.4% |
Healthcare peers with similar quant ratings
MBX is rated 2.21 of 5 among 532 rated Healthcare stocks (Lician quant rating, Nov 4, 2026). How the rating works
- LXRX short interest2.24 · Sell · stock
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- RXST short interest2.22 · Sell · stock
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- KROS short interest2.19 · Sell · stock
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MBX short interest FAQ
What is MBX's short interest?
MBX Biosciences, Inc. Common Stock (MBX) had 4.4M shares sold short and not yet covered in FINRA's Oct 15, 2026 settlement report.
How many days to cover does MBX have?
7.5 days: 4.4M shares short divided by an average daily volume of 593K for the Oct 15, 2026 period.
Is MBX short interest rising or falling?
MBX short interest was little changed (-1.0%) from 4.5M to 4.4M shares in the Oct 15, 2026 report.
Is MBX a short squeeze candidate?
Lician's squeeze watch scores MBX 26 out of 100 (low) from the Oct 15, 2026 report: days to cover 18.7/25, change in short interest vs prior report 0/15, price change since settlement date 6.8/20. It is a transparent model of how crowded the short side is, not a forecast that a squeeze will happen.
What share of MBX daily volume is sold short?
59.9% on average over the last 20 sessions to Nov 2, 2026 (FINRA Reg SHO daily short volume; the 61st percentile of its own 20-day averages). Short volume counts market makers' same-day short sales, so it is not short interest.
What was MBX's latest FINRA short volume?
On Nov 2, 2026, cached FINRA short volume for MBX Biosciences, Inc. Common Stock (MBX) was 85,271 shares, 81.1% of 105,151 total volume.
How many MBX short-volume sessions are listed on this page?
This page lists 10 cached FINRA short-volume sessions for MBX Biosciences, Inc. Common Stock (MBX), from Oct 20, 2026 through Nov 2, 2026.
How did MBX short volume percent change from the prior cached session?
Cached FINRA short volume for MBX Biosciences, Inc. Common Stock (MBX) moved from 65.6% on Oct 30, 2026 to 81.1% on Nov 2, 2026, up 15.5 percentage points.
Not investment advice. Figures as filed or reported, not a live feed.