QSI Dark Pool Activity
QUANTUM-SI INC
Data as of Oct 23, 2026 · Source: FINRA daily short sale volume (off-exchange)
On Oct 23, 2026, FINRA reported 7.2M QSI shares in publicly disseminated off-exchange trades (dark pools and other off-exchange venues). 4.4M of those shares (60.6%) were marked short or short-exempt, above QSI's 30-day rolling average of 48.5% (z-score 1.22). Over the last 10 FINRA sessions (Oct 12, 2026 – Oct 23, 2026), QSI's off-exchange short volume ratio ranged from 28.1% to 60.6% and averaged 42.3%; the latest reading is above that 10-session average.
Off-Exchange Volume
7.2M
Short Volume
4.4M
Short Volume Ratio
60.6%
30-Day Average
48.5%
z-score 1.22
Daily readings — last 10 FINRA sessions
| Date | Off-exchange shares | Short shares | Short ratio |
|---|---|---|---|
| Oct 12, 2026 | 5.9M | 2.5M | 42.7% |
| Oct 13, 2026 | 4.0M | 2.2M | 55.7% |
| Oct 14, 2026 | 2.9M | 1.1M | 37.1% |
| Oct 15, 2026 | 5.1M | 1.4M | 28.1% |
| Oct 16, 2026 | 4.8M | 2.2M | 46.4% |
| Oct 19, 2026 | 5.2M | 2.1M | 40.8% |
| Oct 20, 2026 | 3.6M | 1.5M | 41.4% |
| Oct 21, 2026 | 2.0M | 709K | 36.1% |
| Oct 22, 2026 | 1.7M | 591K | 34.0% |
| Oct 23, 2026 Latest | 7.2M | 4.4M | 60.6% |
Source: FINRA daily short sale volume (off-exchange). Ratio = ShortVolume ÷ TotalVolume for the day.
QSI dark pool FAQ
- How much QSI off-exchange volume did FINRA report on Oct 23, 2026?
- FINRA's daily short sale volume file reported 7.2M QSI shares in publicly disseminated off-exchange trades on Oct 23, 2026; 4.4M of those shares (60.6%) were marked short or short-exempt.
- Is QSI's dark pool short volume ratio unusual right now?
- As of Oct 23, 2026, QSI's short volume ratio of 60.6% is above QSI's 30-day rolling average of 48.5% (z-score 1.22). 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.