| Period | Weighting | Quarter | ||||||
|---|---|---|---|---|---|---|---|---|
| Company | Longest | Shortest | Min. | Avg. | Max. | First | Latest | ↓ Count |
| Citadel Advisors | 11 | 11 | 0.00% | 0.00% | 0.00% | Q2 2013 | Q4 2015 | 11 |
| SIMPLEX TRADING, LLC | 6 | 3 | 0.00% | 0.01% | 0.02% | Q4 2014 | Q1 2017 | 9 |
| Elite Wealth Management, Inc. | 2 | 1 | 0.00% | 0.02% | 0.03% | Q1 2013 | Q3 2014 | 3 |
| GROUP ONE TRADING, L.P. | 1 | 1 | 0.00% | 0.00% | 0.00% | Q1 2015 | Q4 2015 | 2 |
| Marathon Trading Investment Management LLC | 2 | 2 | 0.02% | 0.02% | 0.02% | Q2 2015 | Q3 2015 | 2 |
| STIFEL FINANCIAL CORP | 1 | 1 | 0.00% | 0.00% | 0.00% | Q4 2014 | Q4 2014 | 1 |
This page lists all the filers that currently own GULFMARK OFFSHORE INC or have owned GULFMARK OFFSHORE INC in the past.