| Period | Weighting | Quarter | ||||||
|---|---|---|---|---|---|---|---|---|
| Company | Longest | Shortest | Min. | Avg. | Max. | First | Latest | ↓ Count |
| GROUP ONE TRADING, L.P. | 12 | 1 | 0.00% | 0.00% | 0.00% | Q2 2013 | Q2 2020 | 17 |
| SIMPLEX TRADING, LLC | 12 | 1 | 0.00% | 0.00% | 0.00% | Q2 2016 | Q3 2020 | 14 |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 8 | 8 | 0.00% | 0.00% | 0.00% | Q3 2018 | Q2 2020 | 8 |
This page lists all the filers that currently own ZION OIL & GAS INC or have owned ZION OIL & GAS INC in the past.