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| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 12/31/2018 | HUDSON TECHNOLOGIES INC /NY | HDSN | 0 | -1,079,689 | 0 | -1,382,000 | |
| 09/30/2018 | HUDSON TECHNOLOGIES INC /NY | HDSN | 1,079,689 | -1,032,711 | 1,382,000 | -2,864,000 | $1.28 |
| 06/30/2018 | HUDSON TECHNOLOGIES INC /NY | HDSN | 2,112,400 | 1,073,500 | 4,246,000 | -886,000 | $2.01 |
| 03/31/2018 | HUDSON TECHNOLOGIES INC /NY | HDSN | 1,038,900 | 188,900 | 5,132,000 | -28,000 | $4.94 |
| 12/31/2017 | HUDSON TECHNOLOGIES INC /NY | HDSN | 850,000 | 0 | 5,160,000 | -1,479,000 | $6.07 |
| 09/30/2017 | HUDSON TECHNOLOGIES INC /NY | HDSN | 850,000 | -850,000 | 6,639,000 | -7,726,000 | $7.81 |
| 06/30/2017 | HUDSON TECHNOLOGIES INC /NY | HDSN | 1,700,000 | -250,000 | 14,365,000 | 1,495,000 | $8.45 |
| 03/31/2017 | HUDSON TECHNOLOGIES INC /NY | HDSN | 1,950,000 | 0 | 12,870,000 | -2,750,000 | $6.60 |
| 12/31/2016 | HUDSON TECHNOLOGIES INC /NY | HDSN | 1,950,000 | -300,000 | 15,620,000 | 657,000 | $8.01 |
| 09/30/2016 | HUDSON TECHNOLOGIES INC /NY | HDSN | 2,250,000 | 2,250,000 | 14,963,000 | 14,963,000 | $6.65 |
| 06/30/2016 | HUDSON TECHNOLOGIES INC /NY | HDSN | 2,500,000 | 0 | 9,000,000 | 800,000 | $3.60 |
| 03/31/2016 | HUDSON TECHNOLOGIES INC /NY | HDSN | 2,500,000 | 0 | 8,200,000 | 775,000 | $3.28 |
| 12/31/2015 | HUDSON TECHNOLOGIES INC /NY | HDSN | 2,500,000 | 0 | 7,425,000 | 0 | $2.97 |
| 09/30/2015 | HUDSON TECHNOLOGIES INC /NY | HDSN | 2,500,000 | 0 | 7,425,000 | -1,300,000 | $2.97 |
| 06/30/2015 | HUDSON TECHNOLOGIES INC /NY | HDSN | 2,500,000 | 0 | 8,725,000 | -1,700,000 | $3.49 |
| 03/31/2015 | HUDSON TECHNOLOGIES INC /NY | HDSN | 2,500,000 | 0 | 10,425,000 | 1,000,000 | $4.17 |
| 12/31/2014 | HUDSON TECHNOLOGIES INC /NY | HDSN | 2,500,000 | 0 | 9,425,000 | 1,150,000 | $3.77 |
| 09/30/2014 | HUDSON TECHNOLOGIES INC /NY | HDSN | 2,500,000 | 39,900 | 8,275,000 | 1,165,000 | $3.31 |
| 06/30/2014 | HUDSON TECHNOLOGIES INC /NY | HDSN | 2,460,100 | 2,460,100 | 7,110,000 | 7,110,000 | $2.89 |
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