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DIMENSIONAL FUND ADVISORS LP
> PMD
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 06/30/2023 | PSYCHEMEDICS CORP | PMD | 56,155 | -407 | 256,067,000 | -40,884,000 | $4,560.00 |
| 03/31/2023 | PSYCHEMEDICS CORP | PMD | 56,562 | -2,354 | 296,951,000 | 296,661,000 | $5,250.01 |
| 12/31/2022 | PSYCHEMEDICS CORP | PMD | 58,916 | 190 | 290,000 | -89,000 | $4.92 |
| 09/30/2022 | PSYCHEMEDICS CORP | PMD | 58,726 | -1,103 | 379,000 | 0 | $6.45 |
| 06/30/2022 | PSYCHEMEDICS CORP | PMD | 59,829 | -478 | 379,000 | -40,000 | $6.33 |
| 03/31/2022 | PSYCHEMEDICS CORP | PMD | 60,307 | -2,351 | 419,000 | -16,000 | $6.95 |
| 12/31/2021 | PSYCHEMEDICS CORP | PMD | 62,658 | -13,523 | 435,000 | -213,000 | $6.94 |
| 09/30/2021 | PSYCHEMEDICS CORP | PMD | 76,181 | -38,442 | 648,000 | -150,000 | $8.51 |
| 06/30/2021 | PSYCHEMEDICS CORP | PMD | 114,623 | -838 | 798,000 | 210,000 | $6.96 |
| 12/31/2020 | PSYCHEMEDICS CORP | PMD | 115,461 | -7,151 | 588,000 | 47,000 | $5.09 |
| 09/30/2020 | PSYCHEMEDICS CORP | PMD | 122,612 | -23,409 | 541,000 | -262,000 | $4.41 |
| 06/30/2020 | PSYCHEMEDICS CORP | PMD | 146,021 | 0 | 803,000 | -80,000 | $5.50 |
| 03/31/2020 | PSYCHEMEDICS CORP | PMD | 146,021 | -2,262 | 883,000 | -474,000 | $6.05 |
| 12/31/2019 | PSYCHEMEDICS CORP | PMD | 148,283 | 7,430 | 1,357,000 | 74,000 | $9.15 |
| 09/30/2019 | PSYCHEMEDICS CORP | PMD | 140,853 | 1,500 | 1,283,000 | -123,000 | $9.11 |
| 06/30/2019 | PSYCHEMEDICS CORP | PMD | 139,353 | 6,216 | 1,406,000 | -462,000 | $10.09 |
| 03/31/2019 | PSYCHEMEDICS CORP | PMD | 133,137 | 1,600 | 1,868,000 | -219,000 | $14.03 |
| 12/31/2018 | PSYCHEMEDICS CORP | PMD | 131,537 | -533 | 2,087,000 | -397,000 | $15.87 |
| 09/30/2018 | PSYCHEMEDICS CORP | PMD | 132,070 | 1,515 | 2,484,000 | -28,000 | $18.81 |
| 06/30/2018 | PSYCHEMEDICS CORP | PMD | 130,555 | 603 | 2,512,000 | -175,000 | $19.24 |
| 03/31/2018 | PSYCHEMEDICS CORP | PMD | 129,952 | 5,523 | 2,687,000 | 129,000 | $20.68 |
| 12/31/2017 | PSYCHEMEDICS CORP | PMD | 124,429 | 4,650 | 2,558,000 | 350,000 | $20.56 |
| 09/30/2017 | PSYCHEMEDICS CORP | PMD | 119,779 | 14,256 | 2,208,000 | -425,000 | $18.43 |
| 06/30/2017 | PSYCHEMEDICS CORP | PMD | 105,523 | 13,078 | 2,633,000 | 779,000 | $24.95 |
| 03/31/2017 | PSYCHEMEDICS CORP | PMD | 92,445 | 12,860 | 1,854,000 | -110,000 | $20.06 |
| 12/31/2016 | PSYCHEMEDICS CORP | PMD | 79,585 | 19,573 | 1,964,000 | 773,000 | $24.68 |
| 09/30/2016 | PSYCHEMEDICS CORP | PMD | 60,012 | 9,106 | 1,191,000 | 492,000 | $19.85 |
| 06/30/2016 | PSYCHEMEDICS CORP | PMD | 50,906 | 2,577 | 699,000 | 34,000 | $13.73 |
| 03/31/2016 | PSYCHEMEDICS CORP | PMD | 48,329 | -1,425 | 665,000 | 130,000 | $13.76 |
| 12/31/2015 | PSYCHEMEDICS CORP | PMD | 47,519 | 2,780 | 482,000 | -192,000 | $10.14 |
| 09/30/2015 | PSYCHEMEDICS CORP | PMD | 47,519 | 2,780 | 479,000 | -195,000 | $10.08 |
| 06/30/2015 | PSYCHEMEDICS CORP | PMD | 46,719 | 1,980 | 693,000 | 19,000 | $14.83 |
| 03/31/2015 | PSYCHEMEDICS CORP | PMD | 44,739 | 0 | 743,000 | 69,000 | $16.61 |
| 12/31/2014 | PSYCHEMEDICS CORP | PMD | 44,739 | -5,015 | 674,000 | 139,000 | $15.07 |
| 09/30/2014 | PSYCHEMEDICS CORP | PMD | 45,104 | 0 | 642,000 | 3,000 | $14.23 |
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