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OBERWEIS ASSET MANAGEMENT INC
> CLHB
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 06/30/2023 | CLEAN HARBORS INC | CLHB | 45,105 | -5,730 | 7,416,615,000 | 169,577,000 | $164,430.00 |
| 03/31/2023 | CLEAN HARBORS INC | CLHB | 50,835 | 2,500 | 7,247,038,000 | 1,731,048,000 | $142,560.01 |
| 12/31/2022 | CLEAN HARBORS INC | CLHB | 48,335 | 25,660 | 5,515,990,000 | 5,513,496,000 | $114,120.00 |
| 09/30/2022 | CLEAN HARBORS INC | CLHB | 22,675 | 10,785 | 2,494,000 | 1,452,000 | $109.99 |
| 06/30/2022 | CLEAN HARBORS INC | CLHB | 11,890 | 6,990 | 1,042,000 | 495,000 | $87.64 |
| 03/31/2022 | CLEAN HARBORS INC | CLHB | 4,900 | 2,000 | 547,000 | 258,000 | $111.63 |
| 12/31/2021 | CLEAN HARBORS INC | CLHB | 2,900 | 0 | 289,000 | -12,000 | $99.66 |
| 09/30/2021 | CLEAN HARBORS INC | CLHB | 2,900 | -700 | 301,000 | -34,000 | $103.79 |
| 06/30/2021 | CLEAN HARBORS INC | CLHB | 3,600 | 0 | 335,000 | 32,000 | $93.06 |
| 03/31/2021 | CLEAN HARBORS INC | CLHB | 3,600 | -400 | 303,000 | -1,000 | $84.17 |
| 12/31/2020 | CLEAN HARBORS INC | CLHB | 4,000 | 4,000 | 304,000 | 304,000 | $76.00 |
| 06/30/2019 | CLEAN HARBORS INC | CLHB | 0 | -3,600 | 0 | -258,000 | |
| 03/31/2019 | CLEAN HARBORS INC | CLHB | 3,600 | 3,600 | 258,000 | 258,000 | $71.67 |
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