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Date of Report (Date of earliest event reported): October 16, 2025

(Exact name of registrant as specified in its charter)

(Address of principal executive offices, including zip code)

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

(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:

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

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. ☐

On October 16, 2025, Eos Energy Enterprises, Inc. (the “Company”) held its Special Meeting of Stockholders (“Special Meeting”). On August 20, 2025, the record date for the Special Meeting, 279,216,376 of the Company’s common stock were issued and outstanding, of which 148,182,204 were present for the purposes of establishing a quorum. The following are the voting results for the proposals considered and voted upon at the Special Meeting, each of which was described in the Company’s Definitive Proxy Statement filed with the Securities and Exchange Commission on September 2, 2025:

Proposal 1: To approve, for purposes of complying with the Nasdaq Listing Rules, including, but not limited to, Rule 5635, the Company’s issuance of shares of the Company’s common stock to the Affiliated Purchaser (as defined in the Proxy Statement) upon redemption or conversion of the Notes (as defined in the Proxy Statement) pursuant to the Indenture (as defined in the Proxy Statement) as supplemented by the First Supplemental Indenture (as defined in the Proxy Statement).

For			Against			Abstained
146,304,352			1,426,110			451,742

Proposal 2: To approve an adjournment of the Special Meeting to a later date or dates, if necessary or appropriate, to permit further solicitation of proxies in the event that there are insufficient votes for the approval of Proposal 1 or the absence of a quorum.

For			Against			Abstained
143,665,565			4,086,765			429,874

Based on the foregoing votes, both Proposal 1 and Proposal 2 were approved. No other matters were submitted to or voted on by the Company’s stockholders at the Special Meeting.

(d) Exhibits

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.