HSIC Dark Pool Activity
ATS off-exchange volume intelligence · Week of 2026-07-20
HSIC dark pool volume for the week of 2026-07-20: 1.4M shares traded across 26 ATS venues with a total notional value of $119.6M. Volume is down 36.9% week-over-week. Primary routing venues include , UBS ATS, SIGMA X2.
Dark pool activity in HSIC 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 HSIC.
Weekly History
| Week | Shares | DP % | WoW |
|---|---|---|---|
| 2026-07-20 | 1.4M | — | -36.9% |
| 2026-07-13 | 2.2M | — | +13.8% |
| 2026-07-06 | 2.0M | — | +24.4% |
| 2026-06-29 | 1.6M | — | -0.0% |
| 2026-06-22 | 1.6M | — | +50.2% |
| 2026-06-15 | 1.0M | — | -58.0% |
| 2026-06-08 | 2.5M | — | +48.6% |
| 2026-06-01 | 1.7M | — | -14.2% |
| 2026-05-25 | 1.9M | — | +2.7% |
| 2026-05-18 | 1.9M | — | -51.1% |
| 2026-05-11 | 3.9M | — | +0.2% |
| 2026-05-04 | 3.9M | — | +88.2% |