Eos Energy Enterprises, Inc.

Item 1. Legal Proceedings

From time to time, the Company may be involved in litigation relating to claims arising out of the Company’s operations. While the outcomes of these types of claims are uncertain, management does not expect that the ultimate costs to resolve these matters will have a material adverse effect on our consolidated financial position, results of operations or cash flows.

Class Action Complaints

On March 6, 2026, a class action lawsuit (the “Yung Complaint”) was filed in the United States District Court of New Jersey by plaintiff Shui Shing Yung against the Company and two individual officers: the Company’s Chief Executive Officer and its Chief Financial Officer (with the Company, the “Yung Defendants”). The Yung Complaint alleges that the Yung Defendants violated federal securities laws by making knowingly false or misleading statements about the Company’s manufacturing capabilities and financial outlook. The Company intends to vigorously contest this matter.

On March 13, 2026, a shareholder derivative lawsuit (the “Berger Complaint”) was filed in the United States District Court of the District of New Jersey by plaintiff Paul Berger against certain defendants including the Company’s Chief Executive Officer, the Company’s Chief Financial Officer, and nine of the Company’s current Directors (the “Berger Defendants”). The Berger Complaint alleges that the Berger Defendants breached their fiduciary duties to the Company by allowing the Company to make knowingly false or misleading statements about the Company’s manufacturing capabilities and financial outlook. The Company intends to vigorously contest this matter.

On March 25, 2026, a shareholder derivative lawsuit (the “Skaff Complaint”) was filed in the United States District Court of the District of New Jersey by plaintiff Ronald F. Skaff against certain defendants including the Company’s Chief Executive Officer, the Company’s Chief Financial Officer, and nine of the Company’s current Directors (the “Skaff Defendants”). The Skaff Complaint alleges that the Skaff Defendants breached their fiduciary duties to the Company by allowing the Company to make knowingly false or misleading statements about the Company’s manufacturing capabilities and financial outlook. The Company intends to vigorously contest this matter.