CERS Dark Pool Activity
Cerus Corp
Data as of Oct 23, 2026 · Source: FINRA daily short sale volume (off-exchange)
On Oct 23, 2026, FINRA reported 443K CERS shares in publicly disseminated off-exchange trades (dark pools and other off-exchange venues). 250K of those shares (56.4%) were marked short or short-exempt, above CERS's 30-day rolling average of 45.3% (z-score 0.87). Over the last 10 FINRA sessions (Oct 12, 2026 – Oct 23, 2026), CERS's off-exchange short volume ratio ranged from 22.1% to 71.4% and averaged 46.0%; the latest reading is above that 10-session average.
Off-Exchange Volume
443K
Short Volume
250K
Short Volume Ratio
56.4%
30-Day Average
45.3%
z-score 0.87
Daily readings — last 10 FINRA sessions
| Date | Off-exchange shares | Short shares | Short ratio |
|---|---|---|---|
| Oct 12, 2026 | 416K | 267K | 64.1% |
| Oct 13, 2026 | 877K | 297K | 33.9% |
| Oct 14, 2026 | 948K | 446K | 47.0% |
| Oct 15, 2026 | 740K | 215K | 29.1% |
| Oct 16, 2026 | 552K | 395K | 71.4% |
| Oct 19, 2026 | 678K | 454K | 67.0% |
| Oct 20, 2026 | 527K | 117K | 22.1% |
| Oct 21, 2026 | 634K | 238K | 37.6% |
| Oct 22, 2026 | 408K | 127K | 31.2% |
| Oct 23, 2026 Latest | 443K | 250K | 56.4% |
Source: FINRA daily short sale volume (off-exchange). Ratio = ShortVolume ÷ TotalVolume for the day.
CERS dark pool FAQ
- How much CERS off-exchange volume did FINRA report on Oct 23, 2026?
- FINRA's daily short sale volume file reported 443K CERS shares in publicly disseminated off-exchange trades on Oct 23, 2026; 250K of those shares (56.4%) were marked short or short-exempt.
- Is CERS's dark pool short volume ratio unusual right now?
- As of Oct 23, 2026, CERS's short volume ratio of 56.4% is above CERS's 30-day rolling average of 45.3% (z-score 0.87). 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.