Eos Energy Enterprises Inc

Evaluation of Disclosure Controls and Procedures

Our management, with the participation and supervision of our Chief Executive Officer and our Chief Financial Officer, have evaluated our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e)) under the Exchange Act as of the end of the period covered by this Annual Report on Form 10-K. Based on that evaluation, our Chief Executive Officer and our Chief Financial Officer have concluded that, as of the end of the period covered by this Annual Report on Form 10-K, our disclosure controls and procedures were effective to provide reasonable assurance that information we are required to disclose in reports that we file or submit under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in SEC rules and forms, and that such information 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. Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives, and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

Management’s Annual Report on Internal Control over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as defined in Exchange Act Rules 13a-15(f) and 15d-15(f). Our internal control over financial reporting is designed under the supervision of our Chief Executive Officer and Chief Financial Officer to provide reasonable assurance regarding the reliability of financial reporting and the preparation of consolidated financial statements for external purposes in accordance with generally accepted accounting principles. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Our management, including the CEO and CFO, assessed the effectiveness of our internal control over financial reporting based on the framework set forth by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”) in Internal Control—Integrated Framework (2013 Framework). Based on our assessment, we concluded that our internal control over financial reporting was effective as of December 31, 2024.

Changes in Internal Control over Financial Reporting

Remediation of Previously Identified Material Weaknesses

As disclosed in our Annual Report on Form 10-K filed with the SEC on February 25, 2021, our management identified material weaknesses in our internal control over financial reporting related to: a lack of a formalized internal control framework in accordance with COSO, inadequate segregation of duties within the financial reporting process, lack of review and approval of journal entries, and a lack of management review controls. To address these material weaknesses, management, with oversight of the Audit Committee, implemented the following steps to remediate the material weaknesses:

•We engaged external experts to complement internal resources and to provide support related to more complex applications of GAAP, tax, and internal controls.

•We designed and implemented a comprehensive internal control framework that includes a formal risk assessment process to identify and design our control activities to address all risks of material misstatement whether due to error or fraud.

•We designed and implemented systematic manual journal entry review workflows.

•We designed and implemented IT general controls over the review of user access rights and privileges and implemented more robust review procedures over change management and segregation of duties.

•We developed a formalized process and control documentation for all relevant areas of financial reporting, including IT general and automated controls that support financial reporting.

•We designed and implemented a comprehensive segregation of duties framework and implemented relevant segregation of duties controls, including restricting the ability for one individual to both (i) create and post a journal entry in the general ledger and (ii) prepare and review account reconciliations.

•We designed and implemented management review controls over each significant class of transaction, including areas considered highly complex, judgmental, and subject to management estimation.

•We have designed procedures to validate underlying source data used in our financial reporting controls and the necessary IT general and automated controls to rely on the IT environment supporting our financial reporting.

•We designed and implemented controls to identify any significant and unusual transactions, and analyze, record, report, and disclose such matters.

As of December 31, 2024, our testing of both the design and operating effectiveness of our internal controls was completed, and management has concluded that the previously identified material weaknesses have been fully remediated.

Other than the changes described above related to our remediation of the previously identified material weaknesses, there were no changes to our internal control over financial reporting which were identified in connection with the evaluation required by Rules 13a-15(d) or 15d-15(d) under the Exchange Act during the fourth quarter of 2024 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.