STSS Dark Pool Activity
ATS off-exchange volume intelligence · Week of 2026-05-25
STSS dark pool volume for the week of 2026-05-25: 131.7K shares traded across 19 ATS venues with a total notional value of $237K. Volume is up 76.6% week-over-week. Primary routing venues include , IBKR ATS, MS POOL (ATS-4).
Dark pool activity in STSS 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 STSS.
Weekly History
| Week | Shares | DP % | WoW |
|---|---|---|---|
| 2026-05-25 | 131.7K | — | +76.6% |
| 2026-05-18 | 74.6K | — | -44.5% |
| 2026-05-11 | 134.5K | — | -26.7% |
| 2026-05-04 | 183.5K | — | +34.8% |
| 2026-04-27 | 136.1K | — | — |
| 2026-03-23 | 103.0K | — | -27.0% |
| 2026-03-16 | 141.1K | — | -0.7% |
| 2026-03-09 | 142.2K | — | — |
| 2026-02-02 | 753.1K | — | +58.3% |
| 2026-01-26 | 475.8K | — | -11.5% |
| 2026-01-19 | 537.5K | — | -56.4% |
| 2026-01-12 | 1.2M | — | +55.9% |