MDY Dark Pool Activity
State Street SPDR S&P MIDCAP 40
Data as of Oct 23, 2026 · Source: FINRA daily short sale volume (off-exchange)
On Oct 23, 2026, FINRA reported 144K MDY shares in publicly disseminated off-exchange trades (dark pools and other off-exchange venues). 122K of those shares (84.7%) were marked short or short-exempt, above MDY's 30-day rolling average of 75.9% (z-score 0.93). Over the last 10 FINRA sessions (Oct 12, 2026 – Oct 23, 2026), MDY's off-exchange short volume ratio ranged from 61.8% to 86.1% and averaged 72.7%; the latest reading is above that 10-session average.
Off-Exchange Volume
144K
Short Volume
122K
Short Volume Ratio
84.7%
30-Day Average
75.9%
z-score 0.93
Daily readings — last 10 FINRA sessions
| Date | Off-exchange shares | Short shares | Short ratio |
|---|---|---|---|
| Oct 12, 2026 | 175K | 126K | 72.0% |
| Oct 13, 2026 | 150K | 93K | 61.8% |
| Oct 14, 2026 | 247K | 213K | 86.1% |
| Oct 15, 2026 | 176K | 126K | 71.5% |
| Oct 16, 2026 | 262K | 173K | 66.0% |
| Oct 19, 2026 | 212K | 166K | 78.4% |
| Oct 20, 2026 | 282K | 188K | 66.7% |
| Oct 21, 2026 | 219K | 159K | 72.6% |
| Oct 22, 2026 | 144K | 97K | 67.5% |
| Oct 23, 2026 Latest | 144K | 122K | 84.7% |
Source: FINRA daily short sale volume (off-exchange). Ratio = ShortVolume ÷ TotalVolume for the day.
MDY dark pool FAQ
- How much MDY off-exchange volume did FINRA report on Oct 23, 2026?
- FINRA's daily short sale volume file reported 144K MDY shares in publicly disseminated off-exchange trades on Oct 23, 2026; 122K of those shares (84.7%) were marked short or short-exempt.
- Is MDY's dark pool short volume ratio unusual right now?
- As of Oct 23, 2026, MDY's short volume ratio of 84.7% is above MDY's 30-day rolling average of 75.9% (z-score 0.93). 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.