| Period | Weighting | Quarter | ||||||
|---|---|---|---|---|---|---|---|---|
| Company | Longest | Shortest | Min. | Avg. | Max. | First | Latest | ↓ Count |
| SIMPLEX TRADING, LLC | 8 | 3 | 0.00% | 0.00% | 0.00% | Q3 2015 | Q1 2023 | 23 |
| GROUP ONE TRADING, L.P. | 7 | 1 | 0.00% | 0.00% | 0.00% | Q2 2014 | Q3 2023 | 21 |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 21 | 21 | 0.00% | 0.00% | 0.00% | Q3 2018 | Q3 2023 | 21 |
| Citadel Advisors | 2 | 2 | 0.00% | 0.00% | 0.00% | Q3 2015 | Q4 2015 | 2 |
| Cruiser Capital Advisors, LLC | 1 | 1 | 0.22% | 0.22% | 0.22% | Q3 2023 | Q3 2023 | 1 |
| BLAIR WILLIAM & CO/IL | 1 | 1 | 0.00% | 0.00% | 0.00% | Q2 2017 | Q2 2017 | 1 |
This page lists all the filers that currently own CECO ENVIRONMENTAL CORP or have owned CECO ENVIRONMENTAL CORP in the past.