| Period | Weighting | Quarter | ||||||
|---|---|---|---|---|---|---|---|---|
| Company | Longest | Shortest | Min. | Avg. | Max. | First | Latest | ↓ Count |
| SIMPLEX TRADING, LLC | 6 | 1 | 0.00% | 0.00% | 0.01% | Q1 2016 | Q2 2023 | 22 |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 21 | 21 | 0.00% | 0.00% | 0.00% | Q3 2018 | Q3 2023 | 21 |
| Citadel Advisors | 6 | 4 | 0.00% | 0.00% | 0.00% | Q2 2013 | Q4 2015 | 10 |
| GROUP ONE TRADING, L.P. | 1 | 1 | 0.00% | 0.00% | 0.00% | Q1 2019 | Q1 2019 | 1 |
| CenterBook Partners LP | 1 | 1 | 0.31% | 0.31% | 0.31% | Q4 2021 | Q4 2021 | 1 |
This page lists all the filers that currently own SEI INVESTMENTS CO or have owned SEI INVESTMENTS CO in the past.