MRSH Dark Pool Activity
ATS off-exchange volume intelligence · Week of 2026-07-20
MRSH dark pool volume for the week of 2026-07-20: 4.4M shares traded across 26 ATS venues with a total notional value of $788.6M. Volume is up 91.0% week-over-week. Off-exchange dark pool transactions account for 47.4% of total MRSH market volume — elevated above the typical 10–14% institutional baseline, potentially signaling active accumulation or distribution. Primary routing venues include , UBS ATS, INTELLIGENT CROSS LLC.
Dark pool activity in MRSH 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 MRSH.
Weekly History
| Week | Shares | DP % | WoW |
|---|---|---|---|
| 2026-07-20 | 4.4M | 47.4% | +91.0% |
| 2026-07-13 | 2.3M | — | -20.0% |
| 2026-07-06 | 2.9M | — | +28.2% |
| 2026-06-29 | 2.2M | — | -44.7% |
| 2026-06-22 | 4.0M | — | +80.8% |
| 2026-06-15 | 2.2M | — | -28.8% |
| 2026-06-08 | 3.1M | — | -39.7% |
| 2026-06-01 | 5.2M | — | +43.6% |
| 2026-05-25 | 3.6M | — | +16.7% |
| 2026-05-18 | 3.1M | — | -34.8% |
| 2026-05-11 | 4.8M | — | +19.3% |
| 2026-05-04 | 4.0M | — | +2.8% |