| 4 | Statement of changes in beneficial owner... | Cypress Environmental Partners, L.p. | Donnelley Financial Solutions 06 /fa | 07/07/2022 | |
| 4 | Statement of changes in beneficial owner... | Bok Financial Corp | Ball C Fred Jr /fa | 07/02/2021 | |
| 4 | Statement of changes in beneficial owner... | Cypress Environmental Partners, L.p. | Donnelley Financial Solutions File16 /fa | 06/01/2021 | |
| 4 | Statement of changes in beneficial owner... | Cypress Environmental Partners, L.p. | Donnelley Financial Solutions File16 /fa | 03/11/2021 | |
| 4 | Statement of changes in beneficial owner... | Cypress Environmental Partners, L.p. | Donnelley Financial Solutions File16 /fa | 03/10/2021 | |
| 4 | Statement of changes in beneficial owner... | Cypress Environmental Partners, L.p. | Donnelley Financial Solutions File16 /fa | 03/09/2021 | |
| 4 | Statement of changes in beneficial owner... | Bok Financial Corp | Ball C Fred Jr /fa | 01/12/2021 | |
| 4 | Statement of changes in beneficial owner... | Bok Financial Corp | Ball C Fred Jr /fa | 10/13/2020 | |
| 4 | Statement of changes in beneficial owner... | Bok Financial Corp | Ball C Fred Jr /fa | 07/15/2020 | |
| 4 | Statement of changes in beneficial owner... | Cypress Environmental Partners, L.p. | Donnelley Financial Solutions File16 /fa | 05/07/2020 | |
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