INSM Dark Pool Activity
ATS off-exchange volume intelligence · Week of 2026-07-20
INSM dark pool volume for the week of 2026-07-20: 3.5M shares traded across 27 ATS venues with a total notional value of $377.0M. Volume is down 7.1% week-over-week. Off-exchange dark pool transactions account for 11.8% of total INSM market volume — within the normal institutional baseline range. Primary routing venues include , UBS ATS, INTELLIGENT CROSS LLC.
Dark pool activity in INSM 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 INSM.
Weekly History
| Week | Shares | DP % | WoW |
|---|---|---|---|
| 2026-07-20 | 3.5M | 11.8% | -7.1% |
| 2026-07-13 | 3.8M | — | -10.7% |
| 2026-07-06 | 4.2M | — | +9.7% |
| 2026-06-29 | 3.9M | — | -40.6% |
| 2026-06-22 | 6.5M | — | +5.3% |
| 2026-06-15 | 6.2M | — | -30.1% |
| 2026-06-08 | 8.8M | 71.5% | +44.6% |
| 2026-06-01 | 6.1M | — | +78.4% |
| 2026-05-25 | 3.4M | — | -34.9% |
| 2026-05-18 | 5.2M | — | -47.1% |
| 2026-05-11 | 9.9M | 84.3% | +1.1% |
| 2026-05-04 | 9.8M | 83.5% | +343.1% |