| SC 13G/A | 2020-02-14 | KENNEDY CAPITAL MANAGEMENT, INC. | PSYCHEMEDICS CORP | 377,832 | 6.8% | EDGAR |
| SC 13G/A | 2020-02-14 | CRAWFORD INVESTMENT COUNSEL INC | PSYCHEMEDICS CORP | 331,248 | 6.0% | EDGAR |
| SC 13G/A | 2020-02-13 | RENAISSANCE TECHNOLOGIES LLC | PSYCHEMEDICS CORP | 475,177 | 8.6% | EDGAR |
| SC 13G/A | 2020-02-03 | DEPRINCE RACE & ZOLLO INC | PSYCHEMEDICS CORP | 5,901 | 0.1% | EDGAR |
| SC 13G | 2020-01-27 | Tieton Capital Management, LLC | PSYCHEMEDICS CORP | 334,600 | 6.1% | EDGAR |
| SC 13G | 2019-02-14 | CRAWFORD INVESTMENT COUNSEL INC | PSYCHEMEDICS CORP | 300,975 | 5.5% | EDGAR |
| SC 13G/A | 2019-02-13 | RENAISSANCE TECHNOLOGIES LLC | PSYCHEMEDICS CORP | 439,000 | 8.0% | EDGAR |
| SC 13G | 2019-01-25 | DEPRINCE RACE & ZOLLO INC | PSYCHEMEDICS CORP | 282,186 | 5.1% | EDGAR |
| SC 13G/A | 2018-02-14 | RENAISSANCE TECHNOLOGIES LLC | PSYCHEMEDICS CORP | 464,429 | 8.5% | EDGAR |
| SC 13G/A | 2017-06-01 | Tieton Capital Management, LLC | PSYCHEMEDICS CORP | 266,888 | 4.9% | EDGAR |
| SC 13G/A | 2017-02-14 | RENAISSANCE TECHNOLOGIES LLC | PSYCHEMEDICS CORP | 499,990 | 9.2% | EDGAR |
| SC 13G/A | 2017-01-24 | Tieton Capital Management, LLC | PSYCHEMEDICS CORP | 304,793 | 5.6% | EDGAR |
| SC 13G/A | 2016-02-12 | KENNEDY CAPITAL MANAGEMENT, INC. | PSYCHEMEDICS CORP | 249,476 | 4.6% | EDGAR |
| SC 13G/A | 2016-02-11 | RENAISSANCE TECHNOLOGIES LLC | PSYCHEMEDICS CORP | 435,900 | 8.0% | EDGAR |
| SC 13G/A | 2016-01-12 | Tieton Capital Management, LLC | PSYCHEMEDICS CORP | 369,144 | 6.8% | EDGAR |
| SC 13G/A | 2015-02-13 | KENNEDY CAPITAL MANAGEMENT, INC. | PSYCHEMEDICS CORP | 291,463 | 5.4% | EDGAR |
| SC 13G/A | 2015-02-12 | RENAISSANCE TECHNOLOGIES LLC | PSYCHEMEDICS CORP | 434,900 | 8.1% | EDGAR |
| SC 13G/A | 2015-02-06 | DEPRINCE RACE & ZOLLO INC | PSYCHEMEDICS CORP | 0 | 0.0% | EDGAR |
| SC 13G | 2015-02-05 | Tieton Capital Management, LLC | PSYCHEMEDICS CORP | 363,377 | 6.8% | EDGAR |
| SC 13G/A | 2014-02-13 | RENAISSANCE TECHNOLOGIES LLC | PSYCHEMEDICS CORP | 403,200 | 7.6% | EDGAR |