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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): July 15, 2026

EOS ENERGY ENTERPRISES, INC.

(Exact name of registrant as specified in its charter)

Delaware

001-39291

84-4290188

(State or other jurisdiction

of incorporation)

(Commission

File Number)

(IRS Employer

Identification No.)

Two Allegheny Center

Nova Tower 2

Pittsburgh, Pennsylvania 15212

(Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (732) 225-8400

N/A

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:


☐			Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐			Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐			Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐			Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Common stock, par value $0.0001 per share

EOSE

The Nasdaq Stock Market LLC

Rights to Purchase Units, each Unit consisting of one share of Common Stock and 0.4388 of a Warrant

EOSER

The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition.

On July 15, 2026, the Company issued a press release providing its preliminary results for the quarter ended June 30, 2026 and certain other business updates. A copy of the press release is furnished herewith as Exhibit 99.1.

The information furnished under this Item 2.02 and in the accompanying Exhibit 99.1 shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act regardless of any general incorporation language in such filing, unless expressly incorporated by specific reference in such filing.

Item 7.01 Regulation FD Disclosure.

Item 2.02 above is incorporated herein by reference.

The information furnished under this Item 7.01 and in the accompanying Exhibit 99.1 shall not be deemed “filed” for purposes of Section 18 of the Exchange Act, or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act regardless of any general incorporation language in such filing, unless expressly incorporated by specific reference in such filing.

Item 8.01 Other Events.

Based on preliminary financial information, Eos currently expects:

•Revenue of $68 million to $69 million for the three-month period ended June 30, 2026, driven by a more than three-fold increase in shipments compared to the prior-year period.

•Gross margin loss between 69% and 73%, for the three-month period ended June 30, 2026 reflecting continued progress in manufacturing scale and operational execution. The second quarter marked the Company's transition to operating two commercial production lines across two manufacturing facilities. Battery Line 2 commenced commercial production in late June and has delivered strong initial results, with yield performance and cycle times exceeding those already achieved on Battery Line 1. While start-up costs and lower initial production volumes are expected to create near-term cost absorption pressure, as is typical during the early stages of a production ramp-up, the expansion significantly increases capacity and establishes the foundation for stronger unit economics and expected margin improvement over time.

•Total Cash, including restricted cash, of approximately $364 million as of June 30, 2026.

These preliminary results for the second quarter ended June 30, 2026 are preliminary and estimated based on the information available to us at this time, and should not be viewed as a substitute for our interim unaudited condensed consolidated financial statements prepared in accordance with GAAP. Actual financial results for the second quarter ended June 30, 2026, may differ materially from the preliminary financial results. Accordingly, you should not place undue reliance on these preliminary results. The preliminary results for the second quarter ended June 30, 2026 have been prepared by and are the responsibility of management. Neither our independent registered public accounting firm, nor any other independent accountants, have audited, reviewed, compiled or performed any procedures with respect to the preliminary results, nor have they expressed any opinion or any other form of assurance with respect thereto.

Item 9.01 Financial Statement and Exhibits.

(d) Exhibits


Exhibit Number						Description of Document

99.1						Press release of Eos Energy Enterprises, Inc., dated July 15, 2026
104						Cover page of this Current Report on Form 8-K formatted in Inline XBRL

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.


	EOS ENERGY ENTERPRISES, INC.

Dated: July 15, 2026	By:	/s/ Alessandro Lagi
		Name:	Alessandro Lagi
		Title:	Chief Financial Officer