Upgrade Enhances Market Visibility and Expands Investor Access

Capstone Green Energy Holdings, Inc. (the "Company” or “Capstone”) (OTCQX: CGEH) and Capstone Green Energy, LLC, a leading provider of clean, low-emission microturbine energy systems and services, today announced that the Company’s application to move the trading of its common stock from the OTCID Basic Market to the OTCQX® Best Market has been approved, effective with the opening of trading on September 26, 2025.

The Company’s common stock will begin trading today on the OTCQX Market under the symbol CGEH. The trading symbol and CUSIP number 14067D607 remain unchanged. No action is required by Capstone Green Energy Holdings stockholders. Investors can find current financial disclosures and Real-Time Level 2 quotes for the company on www.otcmarkets.com.

“The Board is very pleased with this achievement, as trading on the OTCQX Best Market reflects the significant progress Capstone has made in strengthening its financial foundation, governance practices, and overall strategic direction,” said Bob Flexon, Chairman of the Board of Capstone Green Energy. “This milestone provides investors with improved transparency and confidence, while positioning the Company to pursue future growth opportunities and enhance long-term shareholder value.”

“Trading on the OTCQX Market represents a positive step forward in Capstone’s transformation journey,” said Vince Canino, President and Chief Executive Officer of Capstone Green Energy. “This milestone reflects the dedication and perseverance of our team as we advance our Three Pillar strategy of Financial Health, Operational Excellence, and Revitalization of Culture & Talent. We continue to strengthen our financial foundation, enhance transparency, and position the Company for long-term growth.”

OTCQX is the top tier of OTC Markets and serves as the premier marketplace for trading over-the-counter securities. It is designed for established, investor-focused U.S. and international companies. To qualify for OTCQX, companies must meet high financial standards, adhere to best-practice corporate governance, and demonstrate compliance with applicable securities laws. Moving to the OTCQX Market represents an important milestone for companies, providing an opportunity to showcase their qualifications and enhance visibility with investors.

“The trading on the OTCQX underscores the meaningful financial progress we have made over the last two years,” said John Juric, Chief Financial Officer of Capstone Green Energy. “Meeting the stringent requirements of OTCQX is a strong validation of our improved operations, enhanced financial reporting, and strengthened balance sheet.”

About Capstone Green Energy

For nearly four decades, Capstone Green Energy has been a leader in clean technology, pioneering the use of microturbines to revolutionize how businesses manage their energy needs sustainably. In collaboration with our global network of dedicated distributors, we have shipped over 10,600 units to 88 countries, helping customers significantly reduce their carbon footprints through high-efficiency, on-site energy systems and microgrid solutions.

Our commitment to a cleaner, more resilient energy future remains steadfast. Today, we offer a comprehensive range of microturbine products, from 65kW systems to multi-megawatt solutions, tailored to meet the specific needs of commercial, industrial, and utility-scale customers. In addition to our core microturbine technology, Capstone’s growing portfolio includes flexible Energy-as-a-Service (EaaS) offerings, such as build-own & transfer models, PPA’s, lease to own and rental solutions, are designed to provide maximum value and energy security.

Capstone’s fast, turnkey power rental solutions are designed for customers with limited capital budgets or short-term energy needs. For more information, please contact us at rentals@CGRNenergy.com.

In our pursuit of cutting-edge energy solutions, Capstone has forged strategic partnerships to expand our impact and capabilities. Through these collaborations, we proudly offer advanced technologies that leverage renewable gas and heat recovery solutions—further enhancing the sustainability, efficiency, and reliability of our clients' operations. These integrated offerings reflect our commitment to building a cleaner, more responsible energy future.

For more information about the Company, please visit www.CapstoneGreenEnergy.com. Follow Capstone Green Energy on Twitter, LinkedIn, Instagram, Facebook, and YouTube.

Cautionary Notes

This release contains forward-looking statements as defined in the Private Securities Litigation Reform Act of 1995. The Company has tried to identify these forward-looking statements by using words such as “expect,” “anticipate,” “believe,” “could,” “should,” “estimate,” “intend,” “may,” “will,” “plan,” “goal” and similar terms and phrases, but such words, terms and phrases are not the exclusive means of identifying such statements. Actual results, performance and achievements could differ materially from those expressed in, or implied by, these forward-looking statements due to a variety of risks, uncertainties and other factors, including, but not limited to, the following: the Company’s liquidity position and ability to access capital; the Company’s ability to continue as a going concern; the Company’s ability to successfully remediate the material weaknesses in internal control over financial reporting; the Company’s ability to realize the anticipated benefits of its financial restructuring; the Company’s ability to comply with the restrictions imposed by covenants contained in the exit financing and the new subsidiary limited liability company agreement; the uncertainty associated with the imposition of tariffs and trade barriers and changes in trade policies; employee attrition and the Company’s ability to retain senior management and other key personnel; the Company's ability to develop new products and enhance existing products; product quality issues, including the adequacy of reserves therefor and warranty cost exposure; intense competition; financial performance of the oil and natural gas industry and other general business, industry and economic conditions; and the impact of litigation and regulatory proceedings. For a detailed discussion of factors that could affect the Company’s future operating results, please see the Company’s filings with the Securities and Exchange Commission, including the risk factors contained in our most recent Annual Report on Form 10-K. Except as expressly required by the federal securities laws, the Company undertakes no obligation to update or revise any forward-looking statements, whether as a result of new information, changed circumstances or future events or for any other reason.

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This milestone provides investors with improved transparency and confidence, while positioning the Company to pursue future growth opportunities and enhance long-term shareholder value