CDNA Dark Pool Activity
CareDx, Inc.
Data as of Oct 23, 2026 · Source: FINRA daily short sale volume (off-exchange)
On Oct 23, 2026, FINRA reported 327K CDNA shares in publicly disseminated off-exchange trades (dark pools and other off-exchange venues). 188K of those shares (57.4%) were marked short or short-exempt, above CDNA's 30-day rolling average of 56.5% (z-score 0.10). Over the last 10 FINRA sessions (Oct 12, 2026 – Oct 23, 2026), CDNA's off-exchange short volume ratio ranged from 40.2% to 69.6% and averaged 59.6%; the latest reading is below that 10-session average.
Off-Exchange Volume
327K
Short Volume
188K
Short Volume Ratio
57.4%
30-Day Average
56.5%
z-score 0.10
Daily readings — last 10 FINRA sessions
| Date | Off-exchange shares | Short shares | Short ratio |
|---|---|---|---|
| Oct 12, 2026 | 410K | 223K | 54.5% |
| Oct 13, 2026 | 708K | 464K | 65.6% |
| Oct 14, 2026 | 444K | 262K | 59.1% |
| Oct 15, 2026 | 585K | 404K | 69.1% |
| Oct 16, 2026 | 646K | 377K | 58.4% |
| Oct 19, 2026 | 461K | 321K | 69.6% |
| Oct 20, 2026 | 683K | 443K | 64.8% |
| Oct 21, 2026 | 721K | 290K | 40.2% |
| Oct 22, 2026 | 434K | 247K | 57.0% |
| Oct 23, 2026 Latest | 327K | 188K | 57.4% |
Source: FINRA daily short sale volume (off-exchange). Ratio = ShortVolume ÷ TotalVolume for the day.
CDNA dark pool FAQ
- How much CDNA off-exchange volume did FINRA report on Oct 23, 2026?
- FINRA's daily short sale volume file reported 327K CDNA shares in publicly disseminated off-exchange trades on Oct 23, 2026; 188K of those shares (57.4%) were marked short or short-exempt.
- Is CDNA's dark pool short volume ratio unusual right now?
- As of Oct 23, 2026, CDNA's short volume ratio of 57.4% is above CDNA's 30-day rolling average of 56.5% (z-score 0.10). 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.