SSTI Dark Pool Activity

ATS off-exchange volume intelligence · Week of 2026-07-06

SSTI dark pool volume for the week of 2026-07-06: 64.2K shares traded across 21 ATS venues with a total notional value of $562K. Volume is down 48.4% week-over-week. Primary routing venues include , SIGMA X2, UBS ATS.

Dark pool activity in SSTI 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 SSTI.