| SC 13D/A | 2019-03-06 | GAMCO INVESTORS, INC. ET AL | SPARTON CORP | - | 0.0% | EDGAR |
| SC 13G | 2019-02-12 | RENAISSANCE TECHNOLOGIES LLC | SPARTON CORP | 513,235 | 5.2% | EDGAR |
| SC 13G/A | 2019-02-11 | VANGUARD GROUP INC | SPARTON CORP | 481,862 | 4.9% | EDGAR |
| SC 13G/A | 2019-02-08 | DIMENSIONAL FUND ADVISORS LP | SPARTON CORP | 789,910 | 8.0% | EDGAR |
| SC 13G/A | 2019-02-06 | BlackRock Inc. | SPARTON CORP | 617,829 | 6.3% | EDGAR |
| SC 13D/A | 2018-12-13 | GAMCO INVESTORS, INC. ET AL | SPARTON CORP | 316,792 | 3.2% | EDGAR |
| SC 13D/A | 2018-08-03 | GAMCO INVESTORS, INC. ET AL | SPARTON CORP | 259,267 | 2.6% | EDGAR |
| SC 13D/A | 2018-07-13 | GAMCO INVESTORS, INC. ET AL | SPARTON CORP | 225,748 | 2.3% | EDGAR |
| SC 13D/A | 2018-05-25 | GAMCO INVESTORS, INC. ET AL | SPARTON CORP | 195,048 | 2.0% | EDGAR |
| SC 13D | 2018-03-09 | GAMCO INVESTORS, INC. ET AL | SPARTON CORP | 183,415 | 1.9% | EDGAR |
| SC 13G/A | 2018-02-14 | Tappan Street Partners LLC | SPARTON CORP | 0 | 0.0% | EDGAR |
| SC 13G/A | 2018-02-09 | DIMENSIONAL FUND ADVISORS LP | SPARTON CORP | 638,774 | 6.5% | EDGAR |
| SC 13G | 2018-02-09 | VANGUARD GROUP INC | SPARTON CORP | 514,387 | 5.2% | EDGAR |
| SC 13G/A | 2018-02-06 | JANUS CAPITAL MANAGEMENT LLC | SPARTON CORP | 0 | 0.0% | EDGAR |
| SC 13G | 2018-02-01 | BlackRock Inc. | SPARTON CORP | 528,451 | 5.4% | EDGAR |
| SC 13G/A | 2017-11-15 | BEDDOW CAPITAL MANAGEMENT INC | SPARTON CORP | 0 | 0.0% | EDGAR |
| SC 13G/A | 2017-06-08 | BlackRock Inc. | SPARTON CORP | 483,522 | 4.9% | EDGAR |
| SC 13G/A | 2017-02-13 | JANUS CAPITAL MANAGEMENT LLC | SPARTON CORP | 538,443 | 5.5% | EDGAR |
| SC 13G/A | 2017-02-09 | DIMENSIONAL FUND ADVISORS LP | SPARTON CORP | 806,059 | 8.2% | EDGAR |
| SC 13G | 2017-01-30 | BlackRock Inc. | SPARTON CORP | 505,706 | 5.2% | EDGAR |