MCK Dark Pool Activity
McKesson Corp
Data as of Sep 10, 2026 · Source: FINRA daily short sale volume (off-exchange)
On Sep 10, 2026, FINRA reported 308K MCK shares in publicly disseminated off-exchange trades (dark pools and other off-exchange venues). 134K of those shares (43.3%) were marked short or short-exempt, below MCK's 30-day rolling average of 55.4% (z-score -1.07).
Off-Exchange Volume
308K
Short Volume
134K
Short Volume Ratio
43.3%
30-Day Average
55.4%
z-score -1.07
MCK dark pool FAQ
- How much MCK off-exchange volume did FINRA report on Sep 10, 2026?
- FINRA's daily short sale volume file reported 308K MCK shares in publicly disseminated off-exchange trades on Sep 10, 2026; 134K of those shares (43.3%) were marked short or short-exempt.
- Is MCK's dark pool short volume ratio unusual right now?
- As of Sep 10, 2026, MCK's short volume ratio of 43.3% is below MCK's 30-day rolling average of 55.4% (z-score -1.07). 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.