| Period | Weighting | Quarter | ||||||
|---|---|---|---|---|---|---|---|---|
| Company | Longest | Shortest | Min. | Avg. | Max. | First | Latest | ↓ Count |
| SIMPLEX TRADING, LLC | 16 | 1 | 0.00% | 0.00% | 0.02% | Q2 2015 | Q3 2023 | 28 |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 21 | 21 | 0.00% | 0.00% | 0.00% | Q3 2018 | Q3 2023 | 21 |
| Twin Tree Management, LP | 3 | 3 | 0.02% | 0.02% | 0.04% | Q1 2023 | Q3 2023 | 3 |
| GROUP ONE TRADING, L.P. | 2 | 2 | 0.00% | 0.00% | 0.00% | Q2 2022 | Q3 2022 | 2 |
| PEAK6 Group LLC | 1 | 1 | 0.00% | 0.00% | 0.00% | Q3 2014 | Q3 2014 | 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 MARKEL CORP or have owned MARKEL CORP in the past.