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ESSEX INVESTMENT MANAGEMENT CO LLC
> CECE
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 06/30/2023 | CECO ENVIRONMENTAL CORP | CECE | 221,562 | 26,139 | 2,960,068,000 | 226,100,000 | $13,360.00 |
| 03/31/2023 | CECO ENVIRONMENTAL CORP | CECE | 195,423 | -54,754 | 2,733,968,000 | 2,731,046,000 | $13,990.00 |
| 12/31/2022 | CECO ENVIRONMENTAL CORP | CECE | 250,177 | -1,765 | 2,922,000 | 692,000 | $11.68 |
| 09/30/2022 | CECO ENVIRONMENTAL CORP | CECE | 251,942 | 6,765 | 2,230,000 | 764,000 | $8.85 |
| 06/30/2022 | CECO ENVIRONMENTAL CORP | CECE | 245,177 | 73,615 | 1,466,000 | 524,000 | $5.98 |
| 03/31/2022 | CECO ENVIRONMENTAL CORP | CECE | 171,562 | 7,859 | 942,000 | -78,000 | $5.49 |
| 12/31/2021 | CECO ENVIRONMENTAL CORP | CECE | 163,703 | 13,077 | 1,020,000 | -40,000 | $6.23 |
| 09/30/2021 | CECO ENVIRONMENTAL CORP | CECE | 150,626 | -993 | 1,060,000 | -26,000 | $7.04 |
| 06/30/2021 | CECO ENVIRONMENTAL CORP | CECE | 151,619 | -30,264 | 1,086,000 | -180,000 | $7.16 |
| 12/31/2020 | CECO ENVIRONMENTAL CORP | CECE | 181,883 | -34,505 | 1,266,000 | -311,000 | $6.96 |
| 09/30/2020 | CECO ENVIRONMENTAL CORP | CECE | 216,388 | 6,937 | 1,577,000 | 197,000 | $7.29 |
| 06/30/2020 | CECO ENVIRONMENTAL CORP | CECE | 209,451 | -1,005 | 1,380,000 | 397,000 | $6.59 |
| 03/31/2020 | CECO ENVIRONMENTAL CORP | CECE | 210,456 | -11,024 | 983,000 | -714,000 | $4.67 |
| 12/31/2019 | CECO ENVIRONMENTAL CORP | CECE | 221,480 | 10,377 | 1,697,000 | 222,000 | $7.66 |
| 09/30/2019 | CECO ENVIRONMENTAL CORP | CECE | 211,103 | -23,821 | 1,475,000 | -778,000 | $6.99 |
| 06/30/2019 | CECO ENVIRONMENTAL CORP | CECE | 234,924 | 34,700 | 2,253,000 | 811,000 | $9.59 |
| 03/31/2019 | CECO ENVIRONMENTAL CORP | CECE | 200,224 | -6,790 | 1,442,000 | 45,000 | $7.20 |
| 12/31/2018 | CECO ENVIRONMENTAL CORP | CECE | 207,014 | 207,014 | 1,397,000 | 1,397,000 | $6.75 |
| 03/31/2016 | CECO ENVIRONMENTAL CORP | CECE | 0 | -40,678 | 0 | -573,000 | |
| 06/30/2014 | CECO ENVIRONMENTAL CORP | CECE | 0 | -40,678 | 0 | -573,000 | |
| 03/31/2014 | CECO ENVIRONMENTAL CORP | CECE | 0 | -40,678 | 0 | -573,000 | |
| 12/31/2013 | CECO ENVIRONMENTAL CORP | CECE | 0 | -40,678 | 0 | -573,000 | |
| 09/30/2013 | CECO ENVIRONMENTAL CORP | CECE | 40,678 | 40,678 | 573,000 | 573,000 | $14.09 |
| 06/30/2013 | CECO ENVIRONMENTAL CORP | CECE | 44,045 | -1,687 | 542,000 | -49,000 | $12.31 |
| 03/31/2013 | CECO ENVIRONMENTAL CORP | CECE | 45,732 | -17,905 | 591,000 | -42,000 | $12.92 |
| 12/31/2012 | CECO ENVIRONMENTAL CORP | CECE | 63,637 | -9,904 | 633,000 | -85,496 | $9.95 |
| 09/30/2012 | CECO ENVIRONMENTAL CORP | CECE | 73,541 | -97,787 | 718,496 | -609,296 | $9.77 |
| 06/30/2012 | CECO ENVIRONMENTAL CORP | CECE | 141,704 | -29,624 | 1,119,462 | -208,330 | $7.90 |
| 03/31/2012 | CECO ENVIRONMENTAL CORP | CECE | 171,328 | 168,310 | 1,327,792 | 1,311,042 | $7.75 |
| 12/31/2011 | CECO ENVIRONMENTAL CORP | CECE | 3,018 | 223 | 16,750 | 844 | $5.55 |
| 09/30/2011 | CECO ENVIRONMENTAL CORP | CECE | 2,795 | -197 | 15,906 | -4,310 | $5.69 |
| 06/30/2011 | CECO ENVIRONMENTAL CORP | CECE | 2,992 | 0 | 20,216 | 2,564 | $6.76 |
| 03/31/2011 | CECO ENVIRONMENTAL CORP | CECE | 2,992 | 0 | 17,653 | -180 | $5.90 |
| 12/31/2010 | CECO ENVIRONMENTAL CORP | CECE | 2,992 | 0 | 17,832 | -30 | $5.96 |
| 09/30/2010 | CECO ENVIRONMENTAL CORP | CECE | 2,992 | 0 | 17,862 | 3,800 | $5.97 |
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