OSS Dark Pool Activity
ATS off-exchange volume intelligence · Week of 2026-07-06
OSS dark pool volume for the week of 2026-07-06: 1.1M shares traded across 26 ATS venues with a total notional value of $16.2M. Volume is up 16.8% week-over-week. Primary routing venues include , UBS ATS, INTELLIGENT CROSS LLC.
Dark pool activity in OSS 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 OSS.
Weekly History
| Week | Shares | DP % | WoW |
|---|---|---|---|
| 2026-07-06 | 1.1M | — | +16.8% |
| 2026-06-29 | 960.1K | — | +8.8% |
| 2026-06-22 | 882.8K | — | -8.7% |
| 2026-06-15 | 967.0K | — | +16.7% |
| 2026-06-08 | 828.6K | — | -20.6% |
| 2026-06-01 | 1.0M | — | +31.7% |
| 2026-05-25 | 791.9K | — | -22.5% |
| 2026-05-18 | 1.0M | — | -28.4% |
| 2026-05-11 | 1.4M | — | -46.8% |
| 2026-05-04 | 2.7M | — | +288.5% |
| 2026-04-27 | 689.8K | — | — |
| 2026-03-23 | 955.4K | — | -39.1% |