MSM Dark Pool Activity
ATS off-exchange volume intelligence · Week of 2026-07-20
MSM dark pool volume for the week of 2026-07-20: 944.9K shares traded across 24 ATS venues with a total notional value of $118.8M. Volume is down 38.6% week-over-week. Primary routing venues include , UBS ATS, INSTINCT X.
Dark pool activity in MSM reflects institutional order flow executing on Alternative Trading Systems (ATS) registered with the SEC — private venues where large-block trades are matched away from public exchanges to minimize price impact. StonkWhisper ingests FINRA-published ATS volume data to track these off-exchange flows. Sustained elevation in dark pool percentage — particularly when concentrated at specific venues — can indicate institutional accumulation or distribution ahead of significant price moves. The interactive charts below show 12-week historical volume and complete venue breakdown for MSM.
Weekly History
| Week | Shares | DP % | WoW |
|---|---|---|---|
| 2026-07-20 | 944.9K | — | -38.6% |
| 2026-07-13 | 1.5M | — | +17.6% |
| 2026-07-06 | 1.3M | — | -36.2% |
| 2026-06-29 | 2.1M | — | +61.2% |
| 2026-06-22 | 1.3M | — | +21.4% |
| 2026-06-15 | 1.0M | — | -10.7% |
| 2026-06-08 | 1.2M | — | +11.5% |
| 2026-06-01 | 1.1M | — | +29.6% |
| 2026-05-25 | 812.5K | — | -24.0% |
| 2026-05-18 | 1.1M | — | -34.0% |
| 2026-05-11 | 1.6M | — | +92.6% |
| 2026-05-04 | 840.5K | — | -49.9% |