Operational Highlights for the Third Quarter of 2026

• Common stock approved for quotation and began trading on the OTCQB Venture Market under the ticker symbol “DBHL” in July 2026
• Selected as the sole industrial partner on three U.S. Department of Energy (“DOE”) Project GENESIS grants advancing artificial intelligence-enabled nuclear waste repository analysis
• Announced results from a three-year DOE-funded study evaluating deep borehole disposal of waste generated by recycling used nuclear fuel
• Subsequent to quarter-end, published customer case study with Slovenia’s Agency for Radio Active Waste Management highlighting the potential cost and operational benefits of Deep Isolation’s deep borehole disposal approach
• Subsequent to quarter-end, announced receipt of a drilling permit from the Texas Railroad Commission for the Company’s full-scale, non-radioactive Commercialization Pilot near Cameron, Texas
• Subsequent to quarter-end, began site preparation, including well pad construction for the full-scale, non-radioactive Commercialization Pilot near Cameron, Texas

Financial Highlights for the Third Quarter of 2026

• Reported consolidated revenue of $1.8 million
• Reported research and development expense of approximately $0.5 million related to the non-radioactive, full-scale, at-depth demonstration of the Company’s deep borehole waste disposal technology 
• Had available cash of $16.5 million as of September 30, 2026
• Reported a net loss of $3.8 million primarily attributable to research and development and selling, general, and administrative expenses
• Total common shares outstanding as of November 9, 2026 of 57,765,606

PLANO, TX, Deep Isolation Nuclear, Inc. (OTCQB: DBHL) (“Deep Isolation” or the “Company”), a leading innovator in nuclear waste disposal technology, today announced its operational and financial results for the three months ended September 30, 2026.

“The third quarter advanced our work toward commercial readiness,” said Rod Baltzer, CEO of Deep Isolation. “We announced results from a three-year DOE-funded study evaluating a permanent disposal pathway for waste from recycled nuclear fuel, and we continued to advance our full-scale, non-radioactive Commercialization Pilot near Cameron, Texas. Subsequent to quarter-end, receipt of the drilling permit from the Texas Railroad Commission and the start of well pad construction marked further steps toward field execution.

“Additionally, our common stock began trading on the OTCQB Venture Market in July, and we were selected as the sole industrial partner on three DOE Project GENESIS grants focused on artificial intelligence-enabled repository analysis. We believe the industry’s growing attention to the full nuclear fuel cycle reinforces the importance of developing practical permanent nuclear waste disposal solutions. Our focus remains on demonstrating our technology and working with customers and collaborators to advance its commercial adoption.”

Operational Progress

During the third quarter, Deep Isolation continued engineering and procurement activities for its non-radioactive, full-scale, at-depth demonstration of its deep borehole disposal technology (the “Commercialization Pilot”) at the Deep Borehole Demonstration Center (“DBDC”), located at Halliburton’s Drilling Technology Facility near Cameron, Texas. The program is designed to test borehole construction, surface handling, and full-scale emplacement and retrieval of the Company’s Universal Canister System (“UCS”). Subsequent to quarter-end, on October 1, 2026, the Company announced that the Texas Railroad Commission had issued a drilling permit, allowing the project to advance toward construction and field activities. The permit is for the non-radioactive pilot and does not authorize disposal of radioactive waste.

On October 28, 2026, the Company announced that site preparation, including well pad construction, had begun at the DBDC. The pad will support drilling, casing and cementing operations for the demonstration borehole as part of the Commercialization Pilot. The Commercialization Pilot is being conducted in collaboration with the DBDC, Halliburton, Amentum, NAC International and Occlusion Nuclear Solutions, using non-radioactive packages to simulate repository operations.

Commercial Progress and Other Company Events

In July 2026, the Company’s common stock was approved for quotation on the OTCQB Venture Market under the symbol “DBHL.” On July 23, 2026, Deep Isolation was selected as the sole industrial partner on three competitive grants under DOE’s Project GENESIS program. Two projects are led by Lawrence Berkeley National Laboratory and one by the University of South Carolina, advancing artificial intelligence-enabled repository site screening, design and performance analysis.

On September 22, 2026, Deep Isolation announced results from a three-year DOE-funded project under ARPA-E’s CURIE program, conducted with Argonne National Laboratory, Oklo and Case Western Reserve University. Deep Isolation evaluated packaging, repository design, long-term safety and economics for disposal of waste from recycled nuclear fuel. All disposal scenarios studied were projected to cost less than the program’s target of 0.1 cent per kilowatt-hour of electricity generated, and all scenarios under expected conditions met the study’s safety performance criteria.

Subsequent to quarter-end, on October 14, 2026, the Company published a customer case study featuring Slovenia’s Agency for Radioactive Waste Management. The assessment compared a standalone disposal facility for TRIGA II research-reactor spent fuel with integration into a proposed deep borehole repository for Krško Nuclear Power Plant spent fuel. The analysis found that integrating the smaller inventory could increase total repository lifecycle costs by less than approximately 0.5%, illustrating the potential benefits of shared disposal infrastructure.

Nuclear Industry Developments

Permanent nuclear waste disposal remained central to discussions of a sustainable nuclear fuel cycle during the third quarter and subsequent to quarter-end. In the United States, the Department of Energy continued exploring Nuclear Lifecycle Innovation Campuses through voluntary federal-state partnerships that could co-locate enrichment, fuel fabrication, used-fuel reprocessing and waste disposition. Utah, Tennessee, Oklahoma, Louisiana and Idaho signed memoranda of understanding in July. These agreements represent continued exploration of potential host sites, rather than authorization to construct or operate a repository. The initiative highlights the importance of considering permanent disposal alongside investment in nuclear generation and fuel recycling.

Internationally, Finland advanced toward permanent nuclear waste disposal in a mined repository when its nuclear safety regulator issued a favorable safety assessment in August. Subsequent to quarter-end, on October 22, the Finnish Government granted Posiva an operating license for its spent-fuel encapsulation and final disposal facility at Olkiluoto, the first such license for a mined repository worldwide. Commissioning tests, inspections and regulatory approvals remain necessary before production operations begin. Fuel-cycle innovation also continued in the United States: in October, ARPA-E selected eight projects for award negotiations under its HORNIG program focused on advanced reactor fuels and the use of recycled nuclear materials. In management’s view, recycling and permanent disposal are complementary elements of long-term waste management, including disposal of the residual waste generated by recycling. Broader nuclear investment continued to reflect demand for reliable electricity, including from artificial intelligence and data centers. Subsequent to quarter-end, Google and Constellation announced a 20-year power purchase agreement on October 6 intended to enable 890 megawatts of additional nuclear capacity through upgrades at 11 existing reactor units. Such investments illustrate the role of existing nuclear facilities in meeting growing power demand while advanced reactor technologies progress toward deployment. In management’s view, continued operation of existing reactors, new nuclear capacity and investment in fuel recycling could expand the long-term need for permanent disposal solutions. Realizing that opportunity will depend on successful technology demonstration, licensing, financing, community engagement and, in the United States, legislative changes needed to allow commercialization of deep borehole disposal. 

Financial Summary

	For the Three Months Ended	For the Three Months Ended
Amounts in thousands of U.S. dollars	Sept 30, 2026	Sept 30, 2025
Revenue	$ 1,787	$ 1,683
Research and development expense	450	$ —
Selling, general and administrative expenses	$ 4,326	$ 2,493
Net Loss	$ (3,764)	$ (1,307)
EBITDA1	$ (3,819)	$ (1,510)
Adjusted EBITDA1	$ (3,369)	$ (1,410)
Cash	$ 16,540	$ 28,209

Revenue increased by approximately $0.1 million, or 6%, for the three months ended September 30, 2026, compared to the three months ended September 30, 2025. The increase in revenue was primarily attributable to completion milestones achieved for certain projects at Deep Isolation along with increased billing at existing projects at Freestone Environmental Services, Inc. (“Freestone”), the Company’s wholly owned environmental consulting subsidiary.

Research and development expense increased by approximately $0.5 million for the three months ended September 30, 2026, compared to the three months ended September 30, 2025. The increase in research and development expense was attributed to the ordering of long-lead items and front-end engineering work related to the Company’s non-radioactive, full-scale, at-depth demonstration of its deep borehole disposal technologies.

Selling, general and administrative expenses increased by approximately $1.8 million, or 74%, for the three months ended September 30, 2026, compared to the three months ended September 30, 2025. The increase in selling, general and administrative expenses was primarily attributable to stock-based compensation along with higher employee and benefits expenses following the addition of 9 new employees since the beginning of 2026, including the Chief Financial Officer and General Counsel.

Net loss increased by $2.5 million for the three months ended September 30, 2026, compared to the three months ended September 30, 2025, primarily due to the increases in research and development and selling, general and administrative expenses described above.

EBITDA¹ was a loss of 3.8 million for the three months ended September 30, 2026, compared to a loss of 1.5 million for the three months ended September 30, 2025. The decrease in EBITDA was primarily attributed to higher research and development expenses and selling, general, and administrative expenses as described above.

Adjusted EBITDA¹ was a loss of $3.4 million for the three months ended September 30, 2026, compared to $1.4 million for the three months ended September 30, 2025. The decrease in Adjusted EBITDA was primarily attributed to higher selling, general, and administrative expenses as described above.

¹ EBITDA and Adjusted EBITDA are non-GAAP financial measures and should not be used in isolation or as a substitute for Deep Isolation’s financial results presented in accordance with Generally Accepted Accounting Principles (“GAAP”). For the definitions and reconciliations of these measures to the most directly comparable financial measures calculated and presented in accordance with GAAP, please refer to Exhibit II at the end of this press release.

View Exhibit I: Unaudited Interim Financial Information

View Exhibit II: Non-GAAP Financial Measures: EBITDA and Adjusted EBITDA

About Deep Isolation

Deep Isolation (OTCQB: DBHL) is the first company to undertake development of technologies for nuclear waste disposal in deep boreholes. Deep Isolation’s solution is designed to offer a unique approach to help countries identify, plan for and complete the necessary steps to dispose of their nuclear waste inventories. With over 100 patents issued to date, Deep Isolation’s technology is designed to leverage proven drilling practices to allow safe isolation of waste deep underground in horizontal, vertical, or slanted borehole repositories. Deep Isolation’s Universal Canister System is engineered to support integrated management of spent fuel and high-level radioactive waste from legacy and advanced reactors across storage, transportation, and eventual disposal. In January 2026, Deep Isolation launched a full-scale, at-depth deep borehole Commercialization Pilot for its solution at Cameron, Texas, in collaboration with the Deep Borehole Demonstration Center, Halliburton (NYSE: HAL), Amentum (NYSE: AMTM), NAC International (TYO: 7004), and Occlusion Nuclear Solutions.

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For more information, visit: deepisolation.com 

Media Contact:
Sophie McCallum
media@deepisolation.com

Investor Contact:
Caldwell Bailey
ICR, Inc.
InvestorRelations@deepisolation.com

Forward-Looking Statements

Statements contained in this press release that are not historical facts are “forward-looking information” or “forward-looking statements” (collectively, “forward-looking statements”) within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements include, but are not limited to, statements regarding our plans, objectives and expectations for our business, the future growth of our business and the nuclear energy and nuclear waste disposal industries as a whole, the Commercialization Pilot, and future benefits expected to arise from our strategic partnerships. In certain cases, forward-looking statements can be identified by the use of words and phrases or variations of words and phrases or statements such as “may,” “should,” “expect,” “intend,” “plan,” “anticipate,” “believe,” “estimate,” “predict,” “will,” “could,” “project,” “target,” “potential,” “continue” and similar expressions. Forward-looking statements are based on management’s belief and assumptions, including current expectations and projections about future events and trends, and on information currently available to management.

Forward-looking statements in this or any other news release are subject to a number of risks, uncertainties, and assumptions that could cause actual results to be materially different from those expressed or implied by such forward-looking statements. Such risks, uncertainties, and assumptions are subject to a number of factors, including, among others: the failure of a market to develop for our deep borehole disposal solutions as quickly as we expect or at all; a failure of demand for our solution to develop sufficiently; regulatory and legal developments, including issues relating to obtaining regulatory approvals or permissions on the timelines we expect or at all; our lack of profitability; delays or failure in our initiative to complete a full-scale, at-depth demonstration of our Universal Canister System and our deep borehole solution; our failure to enter into contracts with customers or, once we do enter into contracts, to continue such contractual relationships or to receive new contract awards; our dependency on governmental contracts and awards and our ability to finalize negotiations on same; our failure to manage our growth effectively or to execute our business plan; our failure to sustain and expand relationships with governmental entities and strategic partners; a failure in the assumptions or analyses we have used in supporting forecasts or plans; our inability to commercialize our products at scale; the development or deployment of other technologies or solutions supplanting or competing with our technologies; challenges to our intellectual property; failures to protect, maintain, enforce, and enhance our intellectual property, and claims by others of intellectual property infringement; political and public perceptions of nuclear energy, including perceptions as to accidents or other high-profile events involving nuclear power facilities or radioactive materials; our liquidity and ability to raise capital; any inability to control operating and project costs and project delays or other project-related problems; security (including cybersecurity) breaches or disruptions; geopolitical, macroeconomic, domestic events or crises, including supply chain disruptions and other risks and uncertainties outside of our control; weather and effects of climate change; and litigation or legal proceedings that may be brought against us.

The foregoing is not an exhaustive list of all the factors that may cause any forward-looking statements to prove inaccurate or our actual results to differ materially from our expectations and forecasts. Moreover, we operate in a highly regulated environment. New risks emerge from time to time. It is not possible for our management to predict all risks, nor can we assess the impact of all factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements we may make. In light of these risks, uncertainties, and assumptions, the future events and trends discussed in this release may not occur and actual results could differ materially and adversely from those anticipated or implied in the forward-looking statements, and we cannot guarantee future results, performance, or achievements. Accordingly, readers should not place undue reliance on forward-looking statements. We undertake no obligation to update any forward-looking statements for any reason after the date of this press release or to conform these statements to actual results or revised expectations, except as required by law. Additional information concerning the factors above and other factors will be found in the Company’s public filings with the Securities and Exchange Commission (the “SEC”), including the sections titled “Forward-Looking Statements” and “Risk Factors” in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2025 filed with the SEC on March 30, 2026, its Quarterly Reports on Form 10-Q for the quarters ended March 31, 2026 and June 30, 2026, filed with the SEC on May 15, 2026 and August 7, 2026, respectively, our Registration Statement Form S-1, originally filed August 18, 2025 and subsequently amended, our Proxy Statement for our 2026 Annual Meeting of Stockholders as filed on April 29, 2026, and in filings with the SEC that will be made in the future.

The Company’s SEC filings are available free of charge at www.sec.gov or upon written request to Deep Isolation at InvestorRelations@deepisolation.com or CorpSec@deepisolation.com.

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