CSGP Dark Pool Activity
CoStar Group, Inc.
Data as of Oct 23, 2026 · Source: FINRA daily short sale volume (off-exchange)
On Oct 23, 2026, FINRA reported 2.9M CSGP shares in publicly disseminated off-exchange trades (dark pools and other off-exchange venues). 885K of those shares (30.8%) were marked short or short-exempt, below CSGP's 30-day rolling average of 39.3% (z-score -0.85). Over the last 10 FINRA sessions (Oct 12, 2026 – Oct 23, 2026), CSGP's off-exchange short volume ratio ranged from 17.7% to 48.6% and averaged 34.3%; the latest reading is below that 10-session average.
Off-Exchange Volume
2.9M
Short Volume
885K
Short Volume Ratio
30.8%
30-Day Average
39.3%
z-score -0.85
Daily readings — last 10 FINRA sessions
| Date | Off-exchange shares | Short shares | Short ratio |
|---|---|---|---|
| Oct 12, 2026 | 1.1M | 473K | 43.2% |
| Oct 13, 2026 | 2.2M | 1.1M | 48.6% |
| Oct 14, 2026 | 1.6M | 678K | 42.3% |
| Oct 15, 2026 | 2.2M | 771K | 35.6% |
| Oct 16, 2026 | 2.1M | 580K | 27.5% |
| Oct 19, 2026 | 1.2M | 410K | 34.6% |
| Oct 20, 2026 | 1.7M | 535K | 31.6% |
| Oct 21, 2026 | 1.2M | 372K | 31.0% |
| Oct 22, 2026 | 3.2M | 569K | 17.7% |
| Oct 23, 2026 Latest | 2.9M | 885K | 30.8% |
Source: FINRA daily short sale volume (off-exchange). Ratio = ShortVolume ÷ TotalVolume for the day.
CSGP dark pool FAQ
- How much CSGP off-exchange volume did FINRA report on Oct 23, 2026?
- FINRA's daily short sale volume file reported 2.9M CSGP shares in publicly disseminated off-exchange trades on Oct 23, 2026; 885K of those shares (30.8%) were marked short or short-exempt.
- Is CSGP's dark pool short volume ratio unusual right now?
- As of Oct 23, 2026, CSGP's short volume ratio of 30.8% is below CSGP's 30-day rolling average of 39.3% (z-score -0.85). 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.