| Period | Weighting | Quarter | ||||||
|---|---|---|---|---|---|---|---|---|
| Company | Longest | Shortest | Min. | Avg. | Max. | First | Latest | ↓ Count |
| SIMPLEX TRADING, LLC | 8 | 1 | 0.00% | 0.00% | 0.00% | Q3 2015 | Q3 2023 | 21 |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 21 | 21 | 0.00% | 0.00% | 0.00% | Q3 2018 | Q3 2023 | 21 |
| GROUP ONE TRADING, L.P. | 3 | 2 | 0.00% | 0.00% | 0.01% | Q4 2013 | Q2 2021 | 11 |
| Citadel Advisors | 2 | 2 | 0.00% | 0.00% | 0.00% | Q3 2015 | Q4 2015 | 2 |
This page lists all the filers that currently own CECO ENVIRONMENTAL CORP or have owned CECO ENVIRONMENTAL CORP in the past.