| Period | Weighting | Quarter | ||||||
|---|---|---|---|---|---|---|---|---|
| Company | Longest | Shortest | Min. | Avg. | Max. | First | Latest | ↓ Count |
| GROUP ONE TRADING, L.P. | 8 | 1 | 0.00% | 0.00% | 0.01% | Q2 2013 | Q4 2018 | 13 |
| SIMPLEX TRADING, LLC | 12 | 1 | 0.00% | 0.00% | 0.01% | Q2 2015 | Q4 2018 | 13 |
| Citadel Advisors | 7 | 4 | 0.00% | 0.00% | 0.00% | Q2 2013 | Q1 2016 | 11 |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 7 | 7 | 0.00% | 0.00% | 0.00% | Q3 2018 | Q1 2020 | 7 |
| SABBY MANAGEMENT, LLC | 1 | 1 | 0.12% | 0.12% | 0.12% | Q1 2015 | Q1 2015 | 1 |
| BLAIR WILLIAM & CO/IL | 1 | 1 | 0.00% | 0.00% | 0.00% | Q2 2015 | Q2 2015 | 1 |
This page lists all the filers that currently own NXSTAGE MEDICAL INC or have owned NXSTAGE MEDICAL INC in the past.