Eos Energy Enterprises

USDC – District of New Jersey

March 9, 2026

CLASS PERIOD: november 5, 2025 – february 26, 2026
LEAD PLAINTIFF DEADLINE: MAY 5, 2026

Please complete the form below to contact Kaplan Fox regarding the Eos Energy Enterprises Investigation:

Principal Contacts

Jeffrey P. Campisi

JCampisi@kaplanfox.com

Laurence D. King

LKing@kaplanfox.com

Kaplan Fox Encourages Investors of Eos Energy Enterprises (EOSE) to Contact the Firm Before Lead Plaintiff Deadline on May 5, 2026

Kaplan Fox & Kilsheimer LLP announces that a class action lawsuit has been filed against Eos Energy Enterprises (“Eos Energy” or the “Company”) (NASDAQ: EOSE) on behalf of investors that purchased or otherwise acquired Eos Energy securities between November 5, 2025 and February 26, 2026 (the “Class Period”).

CLICK HERE TO RECEIVE MORE INFORMATION ABOUT THIS INVESTIGATION

If you are a Eos Energy investor and have suffered losses, or if you have information that could assist in the Eos Energy investigation, you may CLICK HERE to contact us. You may also contact Kaplan Fox by emailing jcampisi@kaplanfox.comor by calling (212) 329-8571.

DEADLINE REMINDER: If you are a member of the proposed Class, you may move the court no later than May 5, 2026 to serve as a lead plaintiff for the purported class.  If you have losses we encourage you to contact us to learn more about the lead plaintiff process. You need not seek to become a lead plaintiff in order to share in any possible recovery.

According to the complaint, “[t] he Class Period begins on November 5, 2025. [] On that day, Eos Energy issued a press release announcing its financial results for the quarter ended September 30, 2025. The press release touted the Company’s financial and operational results as well as its 2025 fiscal year outlook . . . .”

The complaint further alleges that “[o]n February 26, 2026, before the market opened, Eos Energy announced fourth quarter and full year 2025 results, reporting, among other things, full year 2025 revenue of $114.2 million, falling far short of the Company’s previously issued guidance of $150 million to $160 million for fiscal year 2025 revenue. The Company further reported a ‘gross loss of $143.8 million,’ a ‘net loss attributable to shareholders of $969.6 million,’ and an ‘adjusted EBITDA loss of $219.1 million.’ The Company acknowledged ‘full year’s revenue was below expectations,’ and further disclosed its ‘capacity milestone was reached 5 weeks later than initially planned.’”

“On this news, Eos Energy’s stock price fell $4.39, or 39.4%, to close at $6.74 per share on February 26, 2026 on unusually heavy trading volume.”

The complaint alleges “that throughout the Class Period, Defendants made false and/or misleading statements and/or failed to disclose that Defendants (i) the Company was unable to achieve the ramp in production and capacity utilization required to achieve its previously set guidance; (ii) the Company’s battery line downtime was running well above industry norms, the design intent of the line, and internal forecasts; (iii) the Company was experiencing delays in the ability for its automated bipolar production to hit quality targets; (iv) the Company’s inadequate systems and processes prevented it from ensuring reasonably accurate guidance and that its public disclosures were timely, accurate, and complete; and (v) that, as a result of the foregoing, Defendants’ positive statements about the Company’s business, operations, and prospects were materially misleading and/or lacked a reasonable basis.”

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If you have any questions about this investigation, please contact:

CONTACT:

Jeffrey P. Campisi
KAPLAN FOX & KILSHEIMER LLP
800 Third Avenue, 38th Floor
New York, New York 10022
(212) 329-8571
jcampisi@kaplanfox.com

Laurence D. King
KAPLAN FOX & KILSHEIMER LLP
1999 Harrison Street, Suite 1501
Oakland, California 94612
(415) 772-4704
lking@kaplanfox.com

Contacting or submitting information to Kaplan Fox & Kilsheimer LLP does not create an attorney-client relationship, nor an obligation on the part of Kaplan Fox to retain you as a client.