| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13G/A | 2024-02-13 | RENAISSANCE TECHNOLOGIES LLC | PSYCHEMEDICS CORP | 265,563 | 4.6% | EDGAR |
| SC 13G/A | 2024-02-02 | KUBACKI RAYMOND C JR | PSYCHEMEDICS CORP | 246,737 | 4.3% | EDGAR |
| SC 13G | 2023-12-14 | POWELL ANDERSON CAPITAL LP | PSYCHEMEDICS CORP | 312,199 | 5.4% | EDGAR |
| SC 13G/A | 2023-02-14 | KUBACKI RAYMOND C JR | PSYCHEMEDICS CORP | 379,712 | 6.5% | EDGAR |
| SC 13G/A | 2023-02-13 | RENAISSANCE TECHNOLOGIES LLC | PSYCHEMEDICS CORP | 290,463 | 5.2% | EDGAR |
| SC 13D/A | 2022-06-10 | Kamin Peter | PSYCHEMEDICS CORP | 624,737 | 11.1% | EDGAR |
| SC 13D/A | 2022-05-10 | Kamin Peter | PSYCHEMEDICS CORP | 624,737 | 11.2% | EDGAR |
| SC 13D/A | 2022-04-21 | Kamin Peter | PSYCHEMEDICS CORP | 624,737 | 11.2% | EDGAR |
| SC 13G/A | 2022-02-14 | KUBACKI RAYMOND C JR | PSYCHEMEDICS CORP | 343,812 | 6.0% | EDGAR |
| SC 13G/A | 2022-02-14 | CRAWFORD INVESTMENT COUNSEL INC | PSYCHEMEDICS CORP | 266,502 | 4.8% | EDGAR |
| SC 13G/A | 2022-02-11 | RENAISSANCE TECHNOLOGIES LLC | PSYCHEMEDICS CORP | 372,146 | 6.7% | EDGAR |
| SC 13D/A | 2022-01-26 | Kamin Peter | PSYCHEMEDICS CORP | 521,613 | 9.4% | EDGAR |
| SC 13D/A | 2021-09-23 | Kamin Peter | PSYCHEMEDICS CORP | 465,800 | 8.4% | EDGAR |
| SC 13D/A | 2021-08-19 | Kamin Peter | PSYCHEMEDICS CORP | 455,200 | 8.2% | EDGAR |
| SC 13G/A | 2021-02-16 | KENNEDY CAPITAL MANAGEMENT, INC. | PSYCHEMEDICS CORP | 0 | 0.0% | EDGAR |
| SC 13G/A | 2021-02-12 | CRAWFORD INVESTMENT COUNSEL INC | PSYCHEMEDICS CORP | 299,561 | 5.4% | EDGAR |
| SC 13G/A | 2021-02-11 | RENAISSANCE TECHNOLOGIES LLC | PSYCHEMEDICS CORP | 454,640 | 8.2% | EDGAR |
| SC 13G | 2021-02-02 | KUBACKI RAYMOND C JR | PSYCHEMEDICS CORP | 302,374 | 5.4% | EDGAR |
| SC 13D | 2020-12-30 | Kamin Peter | PSYCHEMEDICS CORP | 327,934 | 5.9% | EDGAR |
| SC 13G/A | 2020-03-03 | Tieton Capital Management, LLC | PSYCHEMEDICS CORP | 239,092 | 4.3% | EDGAR |