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| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 12/31/2020 | GEOSPACE TECHNOLOGIES CORP | GEOS | 0 | -394,748 | 0 | -5,451,000 | |
| 12/31/2019 | GEOSPACE TECHNOLOGIES CORP | GEOS | 395,334 | 586 | 6,629,751 | 1,178,751 | $16.77 |
| 12/31/2018 | GEOSPACE TECHNOLOGIES CORP | GEOS | 701,206 | 306,458 | 7,229,434 | 1,778,434 | $10.31 |
| 04/19/2018 | GEOSPACE TECHNOLOGIES CORP | GEOS | 681,206 | 286,458 | 7,316,152 | 1,865,152 | $10.74 |
| 09/30/2015 | GEOSPACE TECHNOLOGIES CORP | GEOS | 394,748 | 394,748 | 5,451,000 | 5,451,000 | $13.81 |
| 06/30/2015 | GEOSPACE TECHNOLOGIES CORP | GEOS | 92,700 | 92,700 | 2,137,000 | 2,137,000 | $23.05 |
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