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NEEDHAM INVESTMENT MANAGEMENT LLC
> CLHB
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 12/31/2022 | CLEAN HARBORS INC | CLHB | 52,506 | -1,500 | 5,991,985,000 | 5,986,046,000 | $114,120.01 |
| 09/30/2022 | CLEAN HARBORS INC | CLHB | 54,006 | 0 | 5,939,000 | 1,204,000 | $109.97 |
| 06/30/2022 | CLEAN HARBORS INC | CLHB | 54,006 | 25,106 | 4,735,000 | 1,508,000 | $87.68 |
| 03/31/2022 | CLEAN HARBORS INC | CLHB | 28,900 | 18,900 | 3,227,000 | 2,229,000 | $111.66 |
| 12/31/2021 | CLEAN HARBORS INC | CLHB | 10,000 | 4,500 | 998,000 | 486,000 | $99.80 |
| 06/30/2021 | CLEAN HARBORS INC | CLHB | 5,500 | 0 | 512,000 | 50,000 | $93.09 |
| 03/31/2021 | CLEAN HARBORS INC | CLHB | 5,500 | 0 | 462,000 | 44,000 | $84.00 |
| 12/31/2020 | CLEAN HARBORS INC | CLHB | 5,500 | 0 | 418,000 | 110,000 | $76.00 |
| 09/30/2020 | CLEAN HARBORS INC | CLHB | 5,500 | 0 | 308,000 | -22,000 | $56.00 |
| 06/30/2020 | CLEAN HARBORS INC | CLHB | 5,500 | 0 | 330,000 | 47,000 | $60.00 |
| 03/31/2020 | CLEAN HARBORS INC | CLHB | 5,500 | 5,500 | 283,000 | 283,000 | $51.45 |
| 03/31/2018 | CLEAN HARBORS INC | CLHB | 0 | -1,000 | 0 | -54,000 | |
| 12/31/2017 | CLEAN HARBORS INC | CLHB | 1,000 | -10,000 | 54,000 | -570,000 | $54.00 |
| 09/30/2017 | CLEAN HARBORS INC | CLHB | 11,000 | 4,000 | 624,000 | 234,000 | $56.73 |
| 06/30/2017 | CLEAN HARBORS INC | CLHB | 7,000 | 0 | 390,000 | 1,000 | $55.71 |
| 03/31/2017 | CLEAN HARBORS INC | CLHB | 7,000 | 7,000 | 389,000 | 389,000 | $55.57 |
| 09/30/2015 | CLEAN HARBORS INC | CLHB | 0 | -21,000 | 0 | -1,128,000 | |
| 06/30/2015 | CLEAN HARBORS INC | CLHB | 21,000 | 21,000 | 1,128,000 | 1,128,000 | $53.71 |
| 03/31/2015 | CLEAN HARBORS INC | CLHB | 21,000 | 21,000 | 1,192,000 | 1,192,000 | $56.76 |
| 12/31/2014 | CLEAN HARBORS INC | CLHB | 21,000 | 21,000 | 1,009,000 | 1,009,000 | $48.05 |
| 09/30/2014 | CLEAN HARBORS INC | CLHB | 20,000 | 20,000 | 1,078,000 | 1,078,000 | $53.90 |
| 06/30/2014 | CLEAN HARBORS INC | CLHB | 20,000 | 20,000 | 1,285,000 | 1,285,000 | $64.25 |
| 03/31/2014 | CLEAN HARBORS INC | CLHB | 20,000 | 20,000 | 1,096,000 | 1,096,000 | $54.80 |
| 12/31/2013 | CLEAN HARBORS INC | CLHB | 15,000 | 15,000 | 900,000 | 900,000 | $60.00 |
| 09/30/2013 | CLEAN HARBORS INC | CLHB | 15,000 | 15,000 | 880,000 | 880,000 | $58.67 |
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