| SC 13D/A | 2023-04-12 | HEARTLAND ADVISORS INC | PERMA FIX ENVIRONMENTAL SERVICES INC | 649,400 | 4.9% | EDGAR |
| SC 13D/A | 2023-03-24 | HEARTLAND ADVISORS INC | PERMA FIX ENVIRONMENTAL SERVICES INC | 729,300 | 5.5% | EDGAR |
| SC 13D/A | 2023-02-17 | HEARTLAND ADVISORS INC | PERMA FIX ENVIRONMENTAL SERVICES INC | 944,569 | 7.1% | EDGAR |
| SC 13D/A | 2023-01-10 | HEARTLAND ADVISORS INC | PERMA FIX ENVIRONMENTAL SERVICES INC | 1,110,500 | 8.3% | EDGAR |
| SC 13D/A | 2021-11-16 | HEARTLAND ADVISORS INC | PERMA FIX ENVIRONMENTAL SERVICES INC | 1,141,000 | 8.6% | EDGAR |
| SC 13D/A | 2021-09-14 | HEARTLAND ADVISORS INC | PERMA FIX ENVIRONMENTAL SERVICES INC | 1,228,114 | 10.1% | EDGAR |
| SC 13D/A | 2021-01-13 | HEARTLAND ADVISORS INC | PERMA FIX ENVIRONMENTAL SERVICES INC | 1,352,530 | 11.1% | EDGAR |
| SC 13D/A | 2020-01-10 | HEARTLAND ADVISORS INC | PERMA FIX ENVIRONMENTAL SERVICES INC | 1,448,430 | 12.0% | EDGAR |
| SC 13D/A | 2019-12-20 | TALANTA Investment Group, LLC | PERMA FIX ENVIRONMENTAL SERVICES INC | 579,114 | 4.8% | EDGAR |
| SC 13D/A | 2017-09-07 | HEARTLAND ADVISORS INC | PERMA FIX ENVIRONMENTAL SERVICES INC | 1,419,439 | 12.1% | EDGAR |
| SC 13D/A | 2017-08-02 | TALANTA Investment Group, LLC | PERMA FIX ENVIRONMENTAL SERVICES INC | 772,356 | 6.6% | EDGAR |
| SC 13D/A | 2017-07-25 | HEARTLAND ADVISORS INC | PERMA FIX ENVIRONMENTAL SERVICES INC | 1,669,439 | 14.3% | EDGAR |
| SC 13D/A | 2017-05-10 | Fundamental Global Investors, LLC | PERMA FIX ENVIRONMENTAL SERVICES INC | - | 2.7% | EDGAR |
| SC 13D | 2017-03-27 | TALANTA Investment Group, LLC | PERMA FIX ENVIRONMENTAL SERVICES INC | 618,014 | 5.3% | EDGAR |
| SC 13D/A | 2016-08-22 | Fundamental Global Investors, LLC | PERMA FIX ENVIRONMENTAL SERVICES INC | - | 7.1% | EDGAR |
| SC 13D | 2016-08-02 | Fundamental Global Investors, LLC | PERMA FIX ENVIRONMENTAL SERVICES INC | - | 5.3% | EDGAR |
| SC 13D | 2016-07-27 | HEARTLAND ADVISORS INC | PERMA FIX ENVIRONMENTAL SERVICES INC | 1,576,007 | 13.6% | EDGAR |
| SC 13G/A | 2016-02-05 | HEARTLAND ADVISORS INC | PERMA FIX ENVIRONMENTAL SERVICES INC | 1,789,947 | 15.5% | EDGAR |
| SC 13G/A | 2016-01-14 | ASEN R SCOTT | PERMA FIX ENVIRONMENTAL SERVICES INC | 0 | 0.0% | EDGAR |
| SC 13G/A | 2015-02-13 | HEARTLAND ADVISORS INC | PERMA FIX ENVIRONMENTAL SERVICES INC | 1,658,472 | 14.5% | EDGAR |