CNI Dark Pool Activity
Canadian National Railway Compa
Data as of Oct 23, 2026 · Source: FINRA daily short sale volume (off-exchange)
On Oct 23, 2026, FINRA reported 313K CNI shares in publicly disseminated off-exchange trades (dark pools and other off-exchange venues). 134K of those shares (42.9%) were marked short or short-exempt, below CNI's 30-day rolling average of 68.1% (z-score -2.17). Over the last 10 FINRA sessions (Oct 12, 2026 – Oct 23, 2026), CNI's off-exchange short volume ratio ranged from 36.8% to 82.6% and averaged 63.6%; the latest reading is below that 10-session average.
Off-Exchange Volume
313K
Short Volume
134K
Short Volume Ratio
42.9%
30-Day Average
68.1%
z-score -2.17
Daily readings — last 10 FINRA sessions
| Date | Off-exchange shares | Short shares | Short ratio |
|---|---|---|---|
| Oct 12, 2026 | 206K | 170K | 82.6% |
| Oct 13, 2026 | 254K | 201K | 79.1% |
| Oct 14, 2026 | 222K | 176K | 79.0% |
| Oct 15, 2026 | 377K | 240K | 63.7% |
| Oct 16, 2026 | 283K | 202K | 71.3% |
| Oct 19, 2026 | 354K | 242K | 68.5% |
| Oct 20, 2026 | 218K | 142K | 65.3% |
| Oct 21, 2026 | 324K | 151K | 46.6% |
| Oct 22, 2026 | 667K | 246K | 36.8% |
| Oct 23, 2026 Latest | 313K | 134K | 42.9% |
Source: FINRA daily short sale volume (off-exchange). Ratio = ShortVolume ÷ TotalVolume for the day.
CNI dark pool FAQ
- How much CNI off-exchange volume did FINRA report on Oct 23, 2026?
- FINRA's daily short sale volume file reported 313K CNI shares in publicly disseminated off-exchange trades on Oct 23, 2026; 134K of those shares (42.9%) were marked short or short-exempt.
- Is CNI's dark pool short volume ratio unusual right now?
- As of Oct 23, 2026, CNI's short volume ratio of 42.9% is below CNI's 30-day rolling average of 68.1% (z-score -2.17). 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.