McKesson Corporation (MCK) short interest & short volume · 2.3M shares short
McKesson Corporation official short interest (FINRA, twice monthly) and daily short volume (FINRA Reg SHO), with history, % of float and days to cover.
What changed
MCK short interest was little changed at 2.3M shares in the Oct 15, 2026 report (3.1 days to cover). Daily short volume averaged 46.2% of volume over the last 20 sessions, down from 58.2% the 20 sessions before, the 21st percentile of its own 20-day averages since Sep 23, 2025.
Short interest
Official, twice monthly · settled Oct 15, 2026
- Shares short
- 2.3M
- prior 2.3M
- % of float
- —
- no float on file
- Days to cover
- 3.1
- avg vol 750K
- Change vs prior report
- +0.5%
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.
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)
- 46.9%
- 155K of 332K
- 20-day average
- 46.2%
- prior 58.2%
- Percentile vs own history
- 21st
- 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: +0.1%
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.
MCK'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 · MCK overview
| Date | Short | Total | Short % of volume |
|---|---|---|---|
| 2026-11-02 | 155,499 | 331,864 | 46.9% |
| 2026-10-30 | 135,600 | 290,609 | 46.7% |
| 2026-10-29 | 123,822 | 290,675 | 42.6% |
| 2026-10-28 | 83,997 | 321,698 | 26.1% |
| 2026-10-27 | 98,225 | 220,136 | 44.6% |
| 2026-10-26 | 55,113 | 206,792 | 26.6% |
| 2026-10-23 | 122,337 | 237,307 | 51.5% |
| 2026-10-22 | 77,840 | 242,040 | 32.2% |
| 2026-10-21 | 99,897 | 259,123 | 38.5% |
| 2026-10-20 | 153,485 | 299,321 | 51.3% |
Healthcare peers with similar quant ratings
MCK is rated 4.55 of 5 among 532 rated Healthcare stocks (Lician quant rating, Nov 4, 2026). How the rating works
- PHR short interest4.58 · Strong Buy · stock
- QGEN short interest4.58 · Strong Buy
- OPCH short interest4.57 · Strong Buy · stock
- HNGE short interest4.56 · Strong Buy · stock
- VCYT short interest4.55 · Strong Buy · stock
- ARGX short interest4.54 · Strong Buy
- AMRX short interest4.53 · Strong Buy · stock
- LFST short interest4.52 · Strong Buy · stock
MCK on Lician stock screens
MCK is rated Strong Buy (4.55 of 5) and passes 1 of 9 preset screens on the Nov 4, 2026 quant run. Build your own screen
MCK short interest FAQ
What is MCK's short interest?
McKesson Corporation (MCK) had 2.3M shares sold short and not yet covered in FINRA's Oct 15, 2026 settlement report.
How many days to cover does MCK have?
3.1 days: 2.3M shares short divided by an average daily volume of 750K for the Oct 15, 2026 period.
Is MCK short interest rising or falling?
MCK short interest was little changed (+0.5%) from 2.3M to 2.3M shares in the Oct 15, 2026 report.
Is MCK a short squeeze candidate?
Lician's squeeze watch scores MCK 8 out of 100 (low) from the Oct 15, 2026 report: days to cover 7.7/25, change in short interest vs prior report 0.1/15, price change since settlement date 0.1/20. It is a transparent model of how crowded the short side is, not a forecast that a squeeze will happen.
What share of MCK daily volume is sold short?
46.2% on average over the last 20 sessions to Nov 2, 2026 (FINRA Reg SHO daily short volume; the 21st percentile of its own 20-day averages). Short volume counts market makers' same-day short sales, so it is not short interest.
What was MCK's latest FINRA short volume?
On Nov 2, 2026, cached FINRA short volume for McKesson Corporation (MCK) was 155,499 shares, 46.9% of 331,864 total volume.
How many MCK short-volume sessions are listed on this page?
This page lists 10 cached FINRA short-volume sessions for McKesson Corporation (MCK), from Oct 20, 2026 through Nov 2, 2026.
How did MCK short volume percent change from the prior cached session?
Cached FINRA short volume for McKesson Corporation (MCK) moved from 46.7% on Oct 30, 2026 to 46.9% on Nov 2, 2026, up 0.2 percentage points.
Not investment advice. Figures as filed or reported, not a live feed.