GMS Dark Pool Activity
ATS off-exchange volume intelligence · Week of 2025-09-01
GMS dark pool volume for the week of 2025-09-01: 104.8K shares traded across 20 ATS venues with a total notional value of $11.5M. Volume is down 83.3% week-over-week. Primary routing venues include , CROSSSTREAM, UBS ATS.
Dark pool activity in GMS 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 GMS.
Weekly History
| Week | Shares | DP % | WoW |
|---|---|---|---|
| 2025-09-01 | 104.8K | — | -83.3% |
| 2025-08-25 | 629.7K | — | -36.8% |
| 2025-08-18 | 997.1K | — | +20.2% |
| 2025-08-11 | 829.8K | — | +5.5% |
| 2025-08-04 | 786.8K | — | -2.5% |
| 2025-07-28 | 807.0K | — | -0.2% |
| 2025-07-21 | 808.7K | — | -54.8% |
| 2025-07-14 | 1.8M | — | +20.4% |
| 2025-07-07 | 1.5M | — | -53.4% |
| 2025-06-30 | 3.2M | — | +83.8% |
| 2025-06-23 | 1.7M | — | -52.7% |
| 2025-06-16 | 3.7M | — | +680.4% |