| Period | Weighting | Quarter | ||||||
|---|---|---|---|---|---|---|---|---|
| Company | Longest | Shortest | Min. | Avg. | Max. | First | Latest | ↓ Count |
| GROUP ONE TRADING, L.P. | 7 | 1 | 0.00% | 0.00% | 0.01% | Q2 2013 | Q1 2018 | 10 |
| SIMPLEX TRADING, LLC | 4 | 1 | 0.00% | 0.00% | 0.00% | Q4 2014 | Q4 2017 | 6 |
This page lists all the filers that currently own LAYNE CHRISTENSEN CO or have owned LAYNE CHRISTENSEN CO in the past.