| Period | Weighting | Quarter | ||||||
|---|---|---|---|---|---|---|---|---|
| Company | Longest | Shortest | Min. | Avg. | Max. | First | Latest | ↓ Count |
| SIMPLEX TRADING, LLC | 6 | 1 | 0.00% | 0.00% | 0.03% | Q2 2015 | Q4 2018 | 10 |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 7 | 7 | 0.00% | 0.00% | 0.00% | Q3 2018 | Q1 2020 | 7 |
| GROUP ONE TRADING, L.P. | 1 | 1 | 0.00% | 0.00% | 0.00% | Q3 2016 | Q3 2016 | 1 |
This page lists all the filers that currently own SPARTON CORP or have owned SPARTON CORP in the past.