MRK Dark Pool Activity
Merck & Company, Inc.
Data as of Oct 26, 2026 · Source: FINRA daily short sale volume (off-exchange)
On Oct 26, 2026, FINRA reported 4.2M MRK shares in publicly disseminated off-exchange trades (dark pools and other off-exchange venues). 1.1M of those shares (25.6%) were marked short or short-exempt, below MRK's 30-day rolling average of 37.1% (z-score -1.05). Over the last 10 FINRA sessions (Oct 13, 2026 – Oct 26, 2026), MRK's off-exchange short volume ratio ranged from 24.2% to 51.1% and averaged 38.1%; the latest reading is below that 10-session average.
Off-Exchange Volume
4.2M
Short Volume
1.1M
Short Volume Ratio
25.6%
30-Day Average
37.1%
z-score -1.05
Daily readings — last 10 FINRA sessions
| Date | Off-exchange shares | Short shares | Short ratio |
|---|---|---|---|
| Oct 13, 2026 | 2.6M | 700K | 27.0% |
| Oct 14, 2026 | 4.3M | 2.2M | 51.1% |
| Oct 15, 2026 | 4.3M | 1.8M | 41.1% |
| Oct 16, 2026 | 3.5M | 1.5M | 41.3% |
| Oct 19, 2026 | 3.5M | 850K | 24.2% |
| Oct 20, 2026 | 3.0M | 1.0M | 35.3% |
| Oct 21, 2026 | 3.0M | 1.3M | 44.5% |
| Oct 22, 2026 | 8.6M | 4.2M | 48.6% |
| Oct 23, 2026 | 3.1M | 1.3M | 42.2% |
| Oct 26, 2026 Latest | 4.2M | 1.1M | 25.6% |
Source: FINRA daily short sale volume (off-exchange). Ratio = ShortVolume ÷ TotalVolume for the day.
MRK dark pool FAQ
- How much MRK off-exchange volume did FINRA report on Oct 26, 2026?
- FINRA's daily short sale volume file reported 4.2M MRK shares in publicly disseminated off-exchange trades on Oct 26, 2026; 1.1M of those shares (25.6%) were marked short or short-exempt.
- Is MRK's dark pool short volume ratio unusual right now?
- As of Oct 26, 2026, MRK's short volume ratio of 25.6% is below MRK's 30-day rolling average of 37.1% (z-score -1.05). 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.