| CAMBRIDGE INVESTMENT RESEARCH, INC. | 39543 | USEDC 2018 B Drilling Fund LP | 1739763 | 01/07/2019 | D/A | $100,000,000 | $50,000 |
| CAMBRIDGE INVESTMENT RESEARCH, INC. | 39543 | USEDC 2019 A Drilling Fund LP | 1781953 | 11/14/2019 | D/A | $200,000,000 | $50,000 |
| CAMBRIDGE INVESTMENT RESEARCH, INC. | 39543 | USEDC 2019 A Drilling Fund LP | 1781953 | 11/26/2019 | D/A | $200,000,000 | $50,000 |
| CAMBRIDGE INVESTMENT RESEARCH, INC. | 39543 | USEDC 2019 B Drilling Fund LP | 1781949 | 01/02/2020 | D/A | $200,000,000 | $50,000 |
| CAMBRIDGE INVESTMENT RESEARCH, INC. | 39543 | USEDC 2021 Drilling Fund LP | 1856119 | 10/05/2021 | D/A | $100,000,000 | $50,000 |
| CAMBRIDGE INVESTMENT RESEARCH, INC. | 39543 | USEDC 2023 Drilling Fund LP | 1970564 | 06/20/2023 | D/A | $300,000,000 | $50,000 |
| CAMBRIDGE INVESTMENT RESEARCH, INC. | 39543 | USEDC 2016 Drilling Fund LP | 1681337 | 11/18/2016 | D/A | $100,000,000 | $45,000 |
| CAMBRIDGE INVESTMENT RESEARCH, INC. | 39543 | USEDC 2017 A Drilling Fund LP | 1708870 | 11/06/2017 | D/A | $75,000,000 | $40,000 |
| CAMBRIDGE INVESTMENT RESEARCH, INC. | 39543 | USEDC 2016 Drilling Fund LP | 1681337 | 11/18/2016 | D/A | $100,000,000 | $30,000 |
| CAMBRIDGE INVESTMENT RESEARCH, INC. | 39543 | USEDC 2021 Drilling Fund LP | 1856119 | 10/05/2021 | D/A | $100,000,000 | $30,000 |
