Altimmune Inc (ALT) short interest & short volume · 25.7% of float short
Altimmune Inc official short interest (FINRA, twice monthly) and daily short volume (FINRA Reg SHO), with history, % of float and days to cover.
What changed
ALT short interest fell 8.3% to 42.2M shares in the Oct 15, 2026 report (25.7% of float, 10.4 days to cover). Daily short volume averaged 50.8% of volume over the last 20 sessions, down from 51.9% the 20 sessions before, the 85th percentile of its own 20-day averages since Sep 22, 2025.
Short interest
Official, twice monthly · settled Oct 15, 2026
- Shares short
- 42.2M
- prior 46.1M
- % of float
- 25.7%
- float 164.2M
- Days to cover
- 10.4
- avg vol 4.1M
- Change vs prior report
- -8.3%
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)
- 46.6%
- 683K of 1.5M
- 20-day average
- 50.8%
- prior 51.9%
- Percentile vs own history
- 85th
- 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: -13.6%
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.
ALT'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 · ALT overview
| Date | Short | Total | Short % of volume |
|---|---|---|---|
| 2026-11-02 | 683,467 | 1,465,068 | 46.6% |
| 2026-10-30 | 1,043,968 | 2,025,435 | 51.5% |
| 2026-10-29 | 650,299 | 1,305,185 | 49.8% |
| 2026-10-28 | 1,149,640 | 2,052,313 | 56.0% |
| 2026-10-27 | 1,170,537 | 2,739,029 | 42.7% |
| 2026-10-26 | 1,145,726 | 2,011,485 | 57.0% |
| 2026-10-23 | 852,458 | 1,475,602 | 57.8% |
| 2026-10-22 | 770,584 | 1,609,586 | 47.9% |
| 2026-10-21 | 1,019,120 | 2,218,927 | 45.9% |
| 2026-10-20 | 589,789 | 1,000,385 | 59.0% |
Healthcare peers with similar quant ratings
ALT is rated 2.79 of 5 among 532 rated Healthcare stocks (Lician quant rating, Nov 4, 2026). How the rating works
- IMCR short interest2.82 · Hold · stock
- RLAY short interest2.82 · Hold · stock
- ALNY short interest2.81 · Hold · stock
- ABCL short interest2.80 · Hold · stock
- NAGE short interest2.79 · Hold · stock
- DMAC short interest2.77 · Hold · stock
- IPSC short interest2.77 · Hold · stock
- CTNM short interest2.76 · Hold · stock
ALT short interest FAQ
What is ALT's short interest?
Altimmune Inc (ALT) had 42.2M shares sold short and not yet covered in FINRA's Oct 15, 2026 settlement report, 25.7% of its 164.2M-share float.
How many days to cover does ALT have?
10.4 days: 42.2M shares short divided by an average daily volume of 4.1M for the Oct 15, 2026 period.
Is ALT short interest rising or falling?
ALT short interest fell (-8.3%) from 46.1M to 42.2M shares in the Oct 15, 2026 report.
Is ALT a short squeeze candidate?
Lician's squeeze watch scores ALT 59 out of 100 (elevated) from the Oct 15, 2026 report: short interest % of float 34.3/40, days to cover 25/25, change in short interest vs prior report 0/15, 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 ALT daily volume is sold short?
50.8% on average over the last 20 sessions to Nov 2, 2026 (FINRA Reg SHO daily short volume; the 85th percentile of its own 20-day averages). Short volume counts market makers' same-day short sales, so it is not short interest.
What was ALT's latest FINRA short volume?
On Nov 2, 2026, cached FINRA short volume for Altimmune Inc (ALT) was 683,467 shares, 46.6% of 1,465,068 total volume.
How many ALT short-volume sessions are listed on this page?
This page lists 10 cached FINRA short-volume sessions for Altimmune Inc (ALT), from Oct 20, 2026 through Nov 2, 2026.
How did ALT short volume percent change from the prior cached session?
Cached FINRA short volume for Altimmune Inc (ALT) moved from 51.5% on Oct 30, 2026 to 46.6% on Nov 2, 2026, down 4.9 percentage points.
Not investment advice. Figures as filed or reported, not a live feed.