KMX Dark Pool Activity
CarMax Inc
Data as of Oct 23, 2026 · Source: FINRA daily short sale volume (off-exchange)
On Oct 23, 2026, FINRA reported 759K KMX shares in publicly disseminated off-exchange trades (dark pools and other off-exchange venues). 478K of those shares (62.9%) were marked short or short-exempt, above KMX's 30-day rolling average of 55.8% (z-score 0.86). Over the last 10 FINRA sessions (Oct 12, 2026 – Oct 23, 2026), KMX's off-exchange short volume ratio ranged from 42.4% to 69.1% and averaged 53.1%; the latest reading is above that 10-session average.
Off-Exchange Volume
759K
Short Volume
478K
Short Volume Ratio
62.9%
30-Day Average
55.8%
z-score 0.86
Daily readings — last 10 FINRA sessions
| Date | Off-exchange shares | Short shares | Short ratio |
|---|---|---|---|
| Oct 12, 2026 | 689K | 323K | 46.9% |
| Oct 13, 2026 | 1.3M | 670K | 50.9% |
| Oct 14, 2026 | 1.1M | 542K | 49.1% |
| Oct 15, 2026 | 1.6M | 676K | 42.4% |
| Oct 16, 2026 | 759K | 330K | 43.5% |
| Oct 19, 2026 | 824K | 462K | 56.0% |
| Oct 20, 2026 | 854K | 450K | 52.8% |
| Oct 21, 2026 | 1.4M | 963K | 69.1% |
| Oct 22, 2026 | 1.1M | 639K | 57.0% |
| Oct 23, 2026 Latest | 759K | 478K | 62.9% |
Source: FINRA daily short sale volume (off-exchange). Ratio = ShortVolume ÷ TotalVolume for the day.
KMX dark pool FAQ
- How much KMX off-exchange volume did FINRA report on Oct 23, 2026?
- FINRA's daily short sale volume file reported 759K KMX shares in publicly disseminated off-exchange trades on Oct 23, 2026; 478K of those shares (62.9%) were marked short or short-exempt.
- Is KMX's dark pool short volume ratio unusual right now?
- As of Oct 23, 2026, KMX's short volume ratio of 62.9% is above KMX's 30-day rolling average of 55.8% (z-score 0.86). Meridian's dark pool model does not flag this reading as an anomaly.
- What does the dark pool short volume ratio measure?
- FINRA publishes daily short sale volume for trades reported off-exchange to its trade reporting facilities, which include dark pools and other off-exchange venues. The ratio divides FINRA's ShortVolume figure, which counts both short and short-exempt sales, by the total off-exchange shares reported for that day. It is not short interest and not a directional signal: market-maker hedging and reporting mechanics can raise it, so it is context for other signals.