ADPT Dark Pool Activity
Adaptive Biotechnologies Corp
Data as of Oct 23, 2026 · Source: FINRA daily short sale volume (off-exchange)
On Oct 23, 2026, FINRA reported 788K ADPT shares in publicly disseminated off-exchange trades (dark pools and other off-exchange venues). 398K of those shares (50.5%) were marked short or short-exempt, above ADPT's 30-day rolling average of 46.5% (z-score 0.33). Over the last 10 FINRA sessions (Oct 12, 2026 – Oct 23, 2026), ADPT's off-exchange short volume ratio ranged from 20.8% to 69.0% and averaged 48.5%; the latest reading is above that 10-session average.
Off-Exchange Volume
788K
Short Volume
398K
Short Volume Ratio
50.5%
30-Day Average
46.5%
z-score 0.33
Daily readings — last 10 FINRA sessions
| Date | Off-exchange shares | Short shares | Short ratio |
|---|---|---|---|
| Oct 12, 2026 | 1.6M | 663K | 42.8% |
| Oct 13, 2026 | 706K | 340K | 48.2% |
| Oct 14, 2026 | 816K | 452K | 55.4% |
| Oct 15, 2026 | 771K | 160K | 20.8% |
| Oct 16, 2026 | 719K | 315K | 43.8% |
| Oct 19, 2026 | 407K | 194K | 47.7% |
| Oct 20, 2026 | 413K | 170K | 41.3% |
| Oct 21, 2026 | 779K | 538K | 69.0% |
| Oct 22, 2026 | 438K | 287K | 65.4% |
| Oct 23, 2026 Latest | 788K | 398K | 50.5% |
Source: FINRA daily short sale volume (off-exchange). Ratio = ShortVolume ÷ TotalVolume for the day.
ADPT dark pool FAQ
- How much ADPT off-exchange volume did FINRA report on Oct 23, 2026?
- FINRA's daily short sale volume file reported 788K ADPT shares in publicly disseminated off-exchange trades on Oct 23, 2026; 398K of those shares (50.5%) were marked short or short-exempt.
- Is ADPT's dark pool short volume ratio unusual right now?
- As of Oct 23, 2026, ADPT's short volume ratio of 50.5% is above ADPT's 30-day rolling average of 46.5% (z-score 0.33). 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.