Eos Energy stockholders approve authorized share increase to 800M for Frontier Power USA

Proposal 1 – Election of directors The Class III Directors proposed by management were elected with a tabulation of votes to the nearest share as shown below. For Against Abstained Broker Non-Vote Jeff Bornstein 169,956,787 5,846,225 685,693 86,942,996 Claude Demby 134,838,436 40,920,524 729,745 86,942,996 Nathaniel Fick 172,365,038 3,501,807 621,860 86,942,996

Proposal 2 – Ratification of appointment of independent registered public accounting firm The ratification of the selection of Deloitte & Touche LLP as the Company’s independent registered public accounting firm for the 2026 fiscal year was approved by stockholders with 259,994,802 shares voted in favor, 1,596,992 shares voted against and 1,839,907 shares abstained.

Proposal 5 – Approval of an amendment to the Company’s Second Amended and Restated 2020 Incentive Plan An amendment to the Company’s Second Amended and Restated 2020 incentive plan was approved by stockholders, with 130,467,068 shares voted in favor, 43,914,568 shares voted against, 2,107,069 shares abstained, and broker non-votes totaling 86,942,996.

Proposal 4 - Approval of an amendment to the Company's Certificate of Incorporation to increase the number of shares of authorized common stock An amendment to the Company's Certificate of Incorporation to increase the number of shares of authorized common stock was approved by stockholders, with 253,788,578 shares voted in favor, 8,570,879 shares voted against, and 1,072,244 shares abstained.

Proposal 3 – Non-binding advisory vote to approve the compensation of named executive officers The compensation of the named executive officers was approved, on an advisory basis, by stockholders, with 131,373,683 shares voted in favor, 43,181,305 shares voted against, 1,933,717 shares abstained, and broker non-votes totaling 86,942,996.