Puma Biotechnology Inc (PBYI) short interest & short volume · 11.9% of float short
Puma Biotechnology Inc official short interest (FINRA, twice monthly) and daily short volume (FINRA Reg SHO), with history, % of float and days to cover.
What changed
PBYI short interest rose 6.5% to 4.5M shares in the Oct 15, 2026 report (11.9% of float, 12.9 days to cover). Daily short volume averaged 64.3% of volume over the last 20 sessions, the 80th percentile of its own 20-day averages since Sep 23, 2025.
Short interest
Official, twice monthly · settled Oct 15, 2026
- Shares short
- 4.5M
- prior 4.3M
- % of float
- 11.9%
- float 38.1M
- Days to cover
- 12.9
- avg vol 353K
- Change vs prior report
- +6.5%
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.
% of float uses the current float for every report (no float was stored with older reports).
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)
- 34.6%
- 57K of 166K
- 20-day average
- 64.3%
- prior 64.5%
- Percentile vs own history
- 80th
- 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: -2.9%
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.
PBYI'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 · PBYI overview
| Date | Short | Total | Short % of volume |
|---|---|---|---|
| 2026-11-02 | 57,438 | 165,903 | 34.6% |
| 2026-10-30 | 77,125 | 140,085 | 55.1% |
| 2026-10-29 | 35,858 | 81,860 | 43.8% |
| 2026-10-28 | 74,555 | 234,893 | 31.7% |
| 2026-10-27 | 64,769 | 102,881 | 63.0% |
| 2026-10-26 | 101,047 | 143,184 | 70.6% |
| 2026-10-23 | 180,269 | 269,561 | 66.9% |
| 2026-10-22 | 113,866 | 161,016 | 70.7% |
| 2026-10-21 | 104,205 | 138,024 | 75.5% |
| 2026-10-20 | 106,552 | 162,196 | 65.7% |
Healthcare peers with similar quant ratings
PBYI is rated 3.82 of 5 among 532 rated Healthcare stocks (Lician quant rating, Nov 4, 2026). How the rating works
- CAI short interest3.85 · Buy · stock
- SGHT short interest3.84 · Buy · stock
- PCVX short interest3.83 · Buy · stock
- BDSX short interest3.82 · Buy · stock
- LH short interest3.81 · Buy · stock
- VOR short interest3.80 · Buy · stock
- CRL short interest3.79 · Buy · stock
- PRVA short interest3.79 · Buy · stock
PBYI on Lician stock screens
PBYI is rated Buy (3.82 of 5) and passes 4 of 9 preset screens on the Nov 4, 2026 quant run. Build your own screen
- Undervalued Healthcare stocks rated Buy or better
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- Healthcare momentum stocks rated Buy or better
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- Highly profitable Healthcare stocks rated Buy or better
- Highly profitable stocks rated Buy or better
- Heavily shorted Healthcare stocks rated Buy or better
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PBYI short interest FAQ
What is PBYI's short interest?
Puma Biotechnology Inc (PBYI) had 4.5M shares sold short and not yet covered in FINRA's Oct 15, 2026 settlement report, 11.9% of its 38.1M-share float.
How many days to cover does PBYI have?
12.9 days: 4.5M shares short divided by an average daily volume of 353K for the Oct 15, 2026 period.
Is PBYI short interest rising or falling?
PBYI short interest rose (+6.5%) from 4.3M to 4.5M shares in the Oct 15, 2026 report.
Is PBYI a short squeeze candidate?
Lician's squeeze watch scores PBYI 43 out of 100 (elevated) from the Oct 15, 2026 report: short interest % of float 15.9/40, days to cover 25/25, change in short interest vs prior report 1.9/15, price change since settlement date 0/20. It is a transparent model of how crowded the short side is, not a forecast that a squeeze will happen.
What share of PBYI daily volume is sold short?
64.3% on average over the last 20 sessions to Nov 2, 2026 (FINRA Reg SHO daily short volume; the 80th percentile of its own 20-day averages). Short volume counts market makers' same-day short sales, so it is not short interest.
What was PBYI's latest FINRA short volume?
On Nov 2, 2026, cached FINRA short volume for Puma Biotechnology Inc (PBYI) was 57,438 shares, 34.6% of 165,903 total volume.
How many PBYI short-volume sessions are listed on this page?
This page lists 10 cached FINRA short-volume sessions for Puma Biotechnology Inc (PBYI), from Oct 20, 2026 through Nov 2, 2026.
How did PBYI short volume percent change from the prior cached session?
Cached FINRA short volume for Puma Biotechnology Inc (PBYI) moved from 55.1% on Oct 30, 2026 to 34.6% on Nov 2, 2026, down 20.5 percentage points.
Not investment advice. Figures as filed or reported, not a live feed.