AZN Dark Pool Activity
AstraZeneca PLC
Data as of Oct 23, 2026 · Source: FINRA daily short sale volume (off-exchange)
On Oct 23, 2026, FINRA reported 977K AZN shares in publicly disseminated off-exchange trades (dark pools and other off-exchange venues). 584K of those shares (59.8%) were marked short or short-exempt, above AZN's 30-day rolling average of 40.8% (z-score 1.63). Over the last 10 FINRA sessions (Oct 12, 2026 – Oct 23, 2026), AZN's off-exchange short volume ratio ranged from 23.1% to 63.5% and averaged 46.3%; the latest reading is above that 10-session average.
Off-Exchange Volume
977K
Short Volume
584K
Short Volume Ratio
59.8%
30-Day Average
40.8%
z-score 1.63
Daily readings — last 10 FINRA sessions
| Date | Off-exchange shares | Short shares | Short ratio |
|---|---|---|---|
| Oct 12, 2026 | 977K | 226K | 23.1% |
| Oct 13, 2026 | 838K | 397K | 47.3% |
| Oct 14, 2026 | 1.1M | 346K | 32.9% |
| Oct 15, 2026 | 1.7M | 848K | 49.0% |
| Oct 16, 2026 | 1.3M | 523K | 40.4% |
| Oct 19, 2026 | 742K | 304K | 41.0% |
| Oct 20, 2026 | 1.1M | 677K | 63.5% |
| Oct 21, 2026 | 547K | 278K | 50.8% |
| Oct 22, 2026 | 824K | 458K | 55.6% |
| Oct 23, 2026 Latest | 977K | 584K | 59.8% |
Source: FINRA daily short sale volume (off-exchange). Ratio = ShortVolume ÷ TotalVolume for the day.
AZN dark pool FAQ
- How much AZN off-exchange volume did FINRA report on Oct 23, 2026?
- FINRA's daily short sale volume file reported 977K AZN shares in publicly disseminated off-exchange trades on Oct 23, 2026; 584K of those shares (59.8%) were marked short or short-exempt.
- Is AZN's dark pool short volume ratio unusual right now?
- As of Oct 23, 2026, AZN's short volume ratio of 59.8% is above AZN's 30-day rolling average of 40.8% (z-score 1.63). 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.