| Period | Weighting | Quarter | ||||||
|---|---|---|---|---|---|---|---|---|
| Company | Longest | Shortest | Min. | Avg. | Max. | First | Latest | ↓ Count |
| GROUP ONE TRADING, L.P. | 8 | 3 | 0.00% | 0.00% | 0.01% | Q2 2013 | Q3 2017 | 11 |
| Citadel Advisors | 10 | 10 | 0.00% | 0.00% | 0.00% | Q2 2013 | Q3 2015 | 10 |
| SIMPLEX TRADING, LLC | 5 | 2 | 0.00% | 0.00% | 0.00% | Q4 2014 | Q2 2017 | 7 |
| 1492 Capital Management LLC | 2 | 2 | 0.12% | 0.14% | 0.15% | Q2 2014 | Q3 2014 | 2 |
This page lists all the filers that currently own PARKER DRILLING CO or have owned PARKER DRILLING CO in the past.