CMCSA Dark Pool Activity
Comcast Corporation
Data as of Oct 23, 2026 · Source: FINRA daily short sale volume (off-exchange)
On Oct 23, 2026, FINRA reported 10.6M CMCSA shares in publicly disseminated off-exchange trades (dark pools and other off-exchange venues). 6.3M of those shares (59.3%) were marked short or short-exempt, above CMCSA's 30-day rolling average of 45.3% (z-score 1.83). Over the last 10 FINRA sessions (Oct 12, 2026 – Oct 23, 2026), CMCSA's off-exchange short volume ratio ranged from 35.6% to 59.3% and averaged 44.1%; the latest reading is above that 10-session average.
Off-Exchange Volume
10.6M
Short Volume
6.3M
Short Volume Ratio
59.3%
30-Day Average
45.3%
z-score 1.83
Daily readings — last 10 FINRA sessions
| Date | Off-exchange shares | Short shares | Short ratio |
|---|---|---|---|
| Oct 12, 2026 | 8.9M | 3.4M | 38.3% |
| Oct 13, 2026 | 9.7M | 3.5M | 36.3% |
| Oct 14, 2026 | 9.3M | 3.3M | 35.6% |
| Oct 15, 2026 | 11.5M | 4.6M | 40.2% |
| Oct 16, 2026 | 9.3M | 3.4M | 36.9% |
| Oct 19, 2026 | 11.9M | 5.1M | 42.9% |
| Oct 20, 2026 | 11.2M | 5.5M | 48.5% |
| Oct 21, 2026 | 13.6M | 6.2M | 45.6% |
| Oct 22, 2026 | 18.2M | 10.4M | 57.5% |
| Oct 23, 2026 Latest | 10.6M | 6.3M | 59.3% |
Source: FINRA daily short sale volume (off-exchange). Ratio = ShortVolume ÷ TotalVolume for the day.
CMCSA dark pool FAQ
- How much CMCSA off-exchange volume did FINRA report on Oct 23, 2026?
- FINRA's daily short sale volume file reported 10.6M CMCSA shares in publicly disseminated off-exchange trades on Oct 23, 2026; 6.3M of those shares (59.3%) were marked short or short-exempt.
- Is CMCSA's dark pool short volume ratio unusual right now?
- As of Oct 23, 2026, CMCSA's short volume ratio of 59.3% is above CMCSA's 30-day rolling average of 45.3% (z-score 1.83). 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.