PRME Dark Pool Activity
Prime Medicine, Inc
Data as of Oct 23, 2026 · Source: FINRA daily short sale volume (off-exchange)
On Oct 23, 2026, FINRA reported 2.5M PRME shares in publicly disseminated off-exchange trades (dark pools and other off-exchange venues). 1.4M of those shares (55.4%) were marked short or short-exempt, below PRME's 30-day rolling average of 57.2% (z-score -0.24). Over the last 10 FINRA sessions (Oct 12, 2026 – Oct 23, 2026), PRME's off-exchange short volume ratio ranged from 51.8% to 69.6% and averaged 58.7%; the latest reading is below that 10-session average.
Off-Exchange Volume
2.5M
Short Volume
1.4M
Short Volume Ratio
55.4%
30-Day Average
57.2%
z-score -0.24
Daily readings — last 10 FINRA sessions
| Date | Off-exchange shares | Short shares | Short ratio |
|---|---|---|---|
| Oct 12, 2026 | 1.7M | 1.0M | 62.5% |
| Oct 13, 2026 | 2.2M | 1.3M | 57.2% |
| Oct 14, 2026 | 1.9M | 1.2M | 61.3% |
| Oct 15, 2026 | 3.5M | 2.0M | 58.5% |
| Oct 16, 2026 | 1.7M | 1.2M | 69.6% |
| Oct 19, 2026 | 1.6M | 991K | 60.3% |
| Oct 20, 2026 | 1.4M | 728K | 51.8% |
| Oct 21, 2026 | 910K | 492K | 54.0% |
| Oct 22, 2026 | 1.3M | 741K | 56.8% |
| Oct 23, 2026 Latest | 2.5M | 1.4M | 55.4% |
Source: FINRA daily short sale volume (off-exchange). Ratio = ShortVolume ÷ TotalVolume for the day.
PRME dark pool FAQ
- How much PRME off-exchange volume did FINRA report on Oct 23, 2026?
- FINRA's daily short sale volume file reported 2.5M PRME shares in publicly disseminated off-exchange trades on Oct 23, 2026; 1.4M of those shares (55.4%) were marked short or short-exempt.
- Is PRME's dark pool short volume ratio unusual right now?
- As of Oct 23, 2026, PRME's short volume ratio of 55.4% is below PRME's 30-day rolling average of 57.2% (z-score -0.24). 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.