| Period | Weighting | Quarter | ||||||
|---|---|---|---|---|---|---|---|---|
| Company | Longest | Shortest | Min. | Avg. | Max. | First | Latest | ↓ Count |
| GROUP ONE TRADING, L.P. | 16 | 16 | 0.00% | 0.01% | 0.03% | Q2 2013 | Q1 2017 | 16 |
| SIMPLEX TRADING, LLC | 10 | 10 | 0.00% | 0.00% | 0.00% | Q4 2014 | Q1 2017 | 10 |
| Citadel Advisors | 1 | 1 | 0.00% | 0.00% | 0.00% | Q2 2016 | Q2 2016 | 1 |
This page lists all the filers that currently own NATIONAL GRID PLC or have owned NATIONAL GRID PLC in the past.