Eos Energy Enterprises, Inc.

On July 29, 2025, the Company entered into a First Supplemental Indenture dated as of July 28, 2025, providing for certain amendments to the terms of the AFG Convertible Notes, and made certain agreements in connection with the First Supplemental Indenture. See Note 22, Subsequent Events to our Unaudited Condensed Consolidated Financial Statements included elsewhere in this Quarterly Report for further discussion.

On July 29, 2025, the Company entered into that certain Fourth Amendment to Credit Agreement, by and among the Company, certain of the Company’s subsidiaries as guarantors thereto and the Lenders, pursuant to which, the measurement period for achieving Sales Milestone 4 (as defined in the Credit Agreement) was extended until October 31, 2025. If the Company fails to meet Sales Milestone 4 on October 31, 2025, then the Applicable Percentage is subject to up to a final 1% increase, and as a result Cerberus would be entitled to receive Preferred Stock or Warrants equal to 1% of the fully diluted outstanding shares of the Company on the final milestone measurement date. See Note 22, Subsequent Events to our Unaudited Condensed Consolidated Financial Statements included elsewhere in this Quarterly Report for further discussion.

The foregoing description of the First Supplemental Indenture and the Fourth Amendment to Credit Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the First Supplemental Indenture and the Fourth Amendment to Credit Agreement, a copy of which is filed with this report as Exhibits 4.3 and 10.5, respectively, and incorporated herein by reference.