AON Dark Pool Activity
Aon plc
Data as of Oct 23, 2026 · Source: FINRA daily short sale volume (off-exchange)
On Oct 23, 2026, FINRA reported 412K AON shares in publicly disseminated off-exchange trades (dark pools and other off-exchange venues). 241K of those shares (58.5%) were marked short or short-exempt, above AON's 30-day rolling average of 38.6% (z-score 1.58). Over the last 10 FINRA sessions (Oct 12, 2026 – Oct 23, 2026), AON's off-exchange short volume ratio ranged from 20.4% to 58.5% and averaged 43.0%; the latest reading is above that 10-session average.
Off-Exchange Volume
412K
Short Volume
241K
Short Volume Ratio
58.5%
30-Day Average
38.6%
z-score 1.58
Daily readings — last 10 FINRA sessions
| Date | Off-exchange shares | Short shares | Short ratio |
|---|---|---|---|
| Oct 12, 2026 | 682K | 139K | 20.4% |
| Oct 13, 2026 | 767K | 179K | 23.3% |
| Oct 14, 2026 | 564K | 231K | 41.0% |
| Oct 15, 2026 | 1.1M | 532K | 47.5% |
| Oct 16, 2026 | 721K | 260K | 36.0% |
| Oct 19, 2026 | 601K | 316K | 52.6% |
| Oct 20, 2026 | 561K | 254K | 45.3% |
| Oct 21, 2026 | 417K | 236K | 56.6% |
| Oct 22, 2026 | 539K | 265K | 49.2% |
| Oct 23, 2026 Latest | 412K | 241K | 58.5% |
Source: FINRA daily short sale volume (off-exchange). Ratio = ShortVolume ÷ TotalVolume for the day.
AON dark pool FAQ
- How much AON off-exchange volume did FINRA report on Oct 23, 2026?
- FINRA's daily short sale volume file reported 412K AON shares in publicly disseminated off-exchange trades on Oct 23, 2026; 241K of those shares (58.5%) were marked short or short-exempt.
- Is AON's dark pool short volume ratio unusual right now?
- As of Oct 23, 2026, AON's short volume ratio of 58.5% is above AON's 30-day rolling average of 38.6% (z-score 1.58). 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.