Eos Energy Distributes Rights To Eligible Holders For 27,367,171 Units At $5.481 Per Unit

Company has commenced its previously announced offering of subscription rights (the "Rights") to holders of its common stock and holders of its warrants to purchase common stock issued on April 14, 2023, May 17, 2023, December 19, 2023 and November 21, 2025 (collectively, "Eligible Holders") as of July 1, 2026 (the "Record Date").

Pursuant to the rights offering, the Company will distribute Rights to acquire an aggregate of 27,367,171 units (the "Units") on July 2, 2026 (the "Distribution Date") at a price per Unit of $5.481 to the Eligible Holders as of the Record Date.

Each Unit consists of one share of the Company’s common stock and 0.4388 of a warrant to purchase one share of the Company’s common stock at an exercise price of $5.481 per whole share.

Further details on the terms and conditions of the warrants are described in the offering documents.

The rights offering includes an over-subscription privilege to permit each Eligible Holder that exercises its basic subscription rights in full to purchase additional Units up to the number of Units underlying its basic subscription right (or 200% combined) that remain unsubscribed on the expiration date for the offering (if any), subject to the availability and allocation of Units among persons exercising this over-subscription privilege and certain other limitations as described in the offering documents.

The Company intends to use the net proceeds of the Rights Offering, if any, to fund its previously announced investment in Frontier Power USA Parent, LLC ("Frontier").

The pricing of the rights offering is summarized below: 1 share or participating warrant held on the Record Date = 1 Right 1 Right = 0.071193 of a Unit exercisable at a price of $5.481 per whole Unit As otherwise stated, each Eligible Holder will receive a Right to acquire one Unit at $5.481 for every ~14 shares or participating warrants held 1 Unit = 1 share of common stock + 0.4388 of a warrant, each whole warrant exercisable for 1 share of common stock at an exercise price of $5.481 per share The Company has applied to have the Rights admitted to trading on the Nasdaq Capital Market, where it expects them to begin trading under the symbol "EOSER" on July 6, 2026.

The Company has also applied to have the Warrants admitted to trading on the Nasdaq Capital Market under the symbol "EOSEW".

However, no assurance can be given that such listing application will be approved.

The rights offering will expire at 5:00 p.m., New York City time, on July 21, 2026.

Further details on the terms of the rights offering and the procedures pursuant to which Eligible Holders can exercise their rights and the transferability of such rights, are described in the offering documents.

With respect to the rights distribution, Broadridge is expected to complete the issuance on the Distribution Date.

Shareholders who hold their shares through a bank or brokerage account should see the rights credited to their accounts after their financial institution completes its internal processing and distribution procedures.

The timing of receipt may vary among each bank and brokerage firm.