COSO Dark Pool Activity
ATS off-exchange volume intelligence · Week of 2026-07-06
COSO dark pool volume for the week of 2026-07-06: 133.8K shares traded across 23 ATS venues with a total notional value of $3.6M. Volume is down 46.4% week-over-week. Primary routing venues include , SIGMA X2, MS POOL (ATS-4).
Dark pool activity in COSO 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 COSO.
Weekly History
| Week | Shares | DP % | WoW |
|---|---|---|---|
| 2026-07-06 | 133.8K | — | -46.4% |
| 2026-06-29 | 249.7K | — | -42.0% |
| 2026-06-22 | 430.5K | — | +181.3% |
| 2026-06-15 | 153.0K | — | -22.2% |
| 2026-06-08 | 196.8K | — | +75.9% |
| 2026-06-01 | 111.9K | — | +32.4% |
| 2026-05-25 | 84.5K | — | -30.1% |
| 2026-05-18 | 121.0K | — | +65.6% |
| 2026-05-11 | 73.0K | — | -59.3% |
| 2026-05-04 | 179.4K | — | +32.7% |
| 2026-04-27 | 135.2K | — | — |
| 2026-03-23 | 74.5K | — | -37.3% |