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| Related Party Transactions | Related Party Transactions Deep Borehole Demonstration Center. Deep Isolation is a member of the Deep Borehole Demonstration Center (“DBDC”). The DBDC is a 501(c)(3) organization that is seeking to obtain multinational membership and funding to demonstrate borehole disposal technology. Deep Isolation employees fill the positions of Chair of the board, Secretary and Treasurer for the DBDC. The DBDC has external members and independent directors, but was started by Deep Isolation and Deep Isolation continues to be involved in the organization. This includes an Administrative Services Agreement that allows Deep Isolation to charge the DBDC for the time the Secretary and Treasurer spend on DBDC business. The amount payable to Deep Isolation from the DBDC was $124 thousand and $117 thousand as of June 30, 2026 and December 31, 2025, respectively, which are fully reserved as of the respective period-ends. NAC International, Inc. NAC International, Inc. (“NAC”) is a stockholder of the Company and its CEO previously served as a director on the Company Board. NAC also provides services to Deep Isolation for revenue generating contracts and has rights to manufacture canisters for Deep Isolation. As of June 30, 2026 and December 31, 2025, Deep Isolation had an outstanding payable to NAC of $274 thousand and $60 thousand, respectively. Deep Fission, Inc. Deep Fission, Inc. (“DFI”), a company co-founded by Deep Isolation’s co-founders and Board Chair, is a related party. In the three and six months ended June 30, 2026, Deep Isolation did not provide services to DFI. In the three and six months ended June 30, 2025, Deep Isolation provided $0 and $25 thousand respectively, in certain services to DFI. As of June 30, 2026 and June 30, 2025, Deep Isolation had $0 and $13 thousand, respectively, in an outstanding receivable from DFI. Below is a summary of related party activities for the six months ended June 30, 2026 and 2025 (in thousands):
(1) The amount payable to Deep Isolation from DBDC is fully reserved as of June 30, 2026, December 31, 2025, and June 30, 2025.
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