Gevo, Inc.

Evaluation of Disclosure Controls and Procedures

We have disclosure controls and procedures, which as defined under Rules 13a-15(e) and 15d-15(e) under the Exchange Act means controls and other procedures of an issuer that are designed to ensure that information required to be disclosed by an issuer in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information we are required to disclose in the reports that we file or submit under the Exchange Act is accumulated and communicated to our management, including our Chief Executive Officer (principal executive officer) and Chief Financial Officer (principal financial officer), as appropriate to allow timely decisions regarding required disclosure.

As previously reported in our Annual Report on Form 10-K for the year ended December 31, 2025, management identified a material weakness in the Company’s internal control over financial reporting related to information technology general controls within certain financial systems of a recently acquired entity. Specifically, deficiencies were identified in controls over privileged access management, change management, and certain IT operations processes. As a result, certain automated controls and IT-dependent manual controls were ineffective. A material weakness is defined as a deficiency, or a combination of deficiencies, in internal control over financial reporting such that there is a reasonable possibility that a material misstatement of our annual or interim financial statements will not be prevented or detected on a timely basis.

As of June 30, 2026, management has initiated remediation efforts, including enhancing user access controls, strengthening change management procedures, and integrating the acquired entity’s ERP system with the Company’s existing systems and applications.

During the fiscal period covered by this report, our management, with the participation of our Chief Executive Officer and Chief Financial Officer, carried out an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Exchange Act). Based on such evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that, as of June 30, 2026, our disclosure controls and procedures were effective to ensure that information required to be disclosed by us in reports that we file or submit under the Exchange Act are recorded, processed, summarized and reported within the required time periods and are designed to ensure that information required to be disclosed in our reports is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer as appropriate, to allow timely decisions regarding required disclosure.

Changes in Internal Control Over Financial Reporting

Except as disclosed above, there were no changes in our internal control over financial reporting that occurred during the three months ended June 30, 2026, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.