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| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 12/31/2020 | Energy Recovery, Inc. | ERII | 0 | -250,000 | 0 | -2,050,000 | |
| 09/30/2020 | Energy Recovery, Inc. | ERII | 250,000 | 81,057 | 2,050,000 | 767,000 | $8.20 |
| 06/30/2020 | Energy Recovery, Inc. | ERII | 168,943 | 168,943 | 1,283,000 | 1,283,000 | $7.59 |
| 06/30/2019 | Energy Recovery, Inc. | ERII | 0 | -350,000 | 0 | -3,056,000 | |
| 03/31/2019 | Energy Recovery, Inc. | ERII | 350,000 | 0 | 3,056,000 | 700,000 | $8.73 |
| 12/31/2018 | Energy Recovery, Inc. | ERII | 350,000 | -150,000 | 2,356,000 | -2,119,000 | $6.73 |
| 09/30/2018 | Energy Recovery, Inc. | ERII | 500,000 | -488,094 | 4,475,000 | -3,509,000 | $8.95 |
| 06/30/2018 | Energy Recovery, Inc. | ERII | 988,094 | -11,906 | 7,984,000 | -236,000 | $8.08 |
| 03/31/2018 | Energy Recovery, Inc. | ERII | 1,000,000 | 150,000 | 8,220,000 | 782,000 | $8.22 |
| 12/31/2017 | Energy Recovery, Inc. | ERII | 850,000 | 0 | 7,438,000 | 723,000 | $8.75 |
| 09/30/2017 | Energy Recovery, Inc. | ERII | 850,000 | 550,000 | 6,715,000 | 4,228,000 | $7.90 |
| 06/30/2017 | Energy Recovery, Inc. | ERII | 300,000 | 300,000 | 2,487,000 | 2,487,000 | $8.29 |
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