Cerberus GP Manager LLC - 04 Aug 2026 Form 4 Insider Report for Eos Energy Enterprises, Inc. (EOSE)

Reporting relationship: Director, 10%+ Owner
Issuer ticker: EOSE
Reported as of: 04 Aug 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 06 Aug 2026, 17:16:00 UTC
Source filing: View source filing
Reporting owner signature: CERBERUS GP MANAGER LI.C By: /s/ Alexander D. Beniamin/Senior Managing Director

Key filing fact

Cerberus GP Manager LLC filed Form 4 for Eos Energy Enterprises, Inc. (EOSE) on 06 Aug 2026.

Key facts

This page summarizes Cerberus GP Manager LLC's Form 4 filing for Eos Energy Enterprises, Inc. (EOSE).
1 reported transaction and 4 derivative rows are listed below.
Accepted by SEC: 06 Aug 2026, 17:16.

Change

No earlier filing in this sequence is available for direct comparison.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (4)

CIK 0002138721 Primary reporting owner

Cerberus GP Manager LLC

Relationship: Director, 10%+ Owner
Address: 875 THIRD AVENUE, 11TH FLOOR, NEW YORK
Signature: CERBERUS GP MANAGER LI.C By: /s/ Alexander D. Beniamin/Senior Managing Director
Signature date: 06 Aug 2026

CIK 0002138492

CCM Frontier JV Holdco, LLC

Relationship: Director, 10%+ Owner
Address: 875 THIRD AVENUE, 11TH FLOOR, NEW YORK
Signature: CCM FRONTIER JV HOLDCO, LLC By: /s/ Jake Hansen/President
Signature date: 06 Aug 2026

CIK 0002138501

CCM Frontier Power USA Holdings GP, LLC

Relationship: Director, 10%+ Owner
Address: 875 THIRD AVENUE, 11TH FLOOR, NEW YORK
Signature: CCM FRONTIER POWER USA HOLDINGS, LP By: /s/ Jake Hansen/President
Signature date: 06 Aug 2026

CIK 0002138494

CCM Frontier Power USA Holdings, LP

Relationship: Director, 10%+ Owner
Address: 875 TTHIRD AVENUE, 11TH FLOOR, NEW YORK
Signature: CCM FRONTIER POWER USA HOLDINGS GP, LLC By: /s/ Jake Hansen/President
Signature date: 06 Aug 2026

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

EOSE transaction Derivative

Warrant (right to buy)

Award

Transaction value
Shares: +20,017,772
Change %
Price
Shares after: 20,017,772
Date: 04 Aug 2026
Ownership: See Footnotes
Underlying class: Common Stock
Underlying amount: 20,017,772
Exercise price: $5.48
Footnotes: F1, F2, F3, F4, F5

EOSE transaction Derivative

Warrant (right to buy)

Award

Transaction value
Shares: +20,017,772
Change %
Price
Shares after: 20,017,772
Date: 04 Aug 2026
Ownership: See Footnotes
Underlying class: Common Stock
Underlying amount: 20,017,772
Exercise price: $5.48
Footnotes: F1, F2, F3, F4, F5

EOSE transaction Derivative

Warrant (right to buy)

Award

Transaction value
Shares: +20,017,772
Change %
Price
Shares after: 20,017,772
Date: 04 Aug 2026
Ownership: See Footnotes
Underlying class: Common Stock
Underlying amount: 20,017,772
Exercise price: $5.48
Footnotes: F1, F2, F3, F4, F5

EOSE transaction Derivative

Warrant (right to buy)

Award

Transaction value
Shares: +20,017,772
Change %
Price
Shares after: 20,017,772
Date: 04 Aug 2026
Ownership: See Footnotes
Underlying class: Common Stock
Underlying amount: 20,017,772
Exercise price: $5.48
Footnotes: F1, F2, F3, F4, F5

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote F1

On August 4, 2026, Eos Energy Enterprises Inc. (the "Issuer"), CCM Frontier JV Holdco, LLC ("CCM Frontier"), and HBC MSF Capital Solutions Blocker II LLC, an affiliate of Hudson Bay Capital Management LP ("HBC"), consummated the closing of the funding of Frontier Power USA Parent, LLC (the "JV Company"), a joint venture among the Issuer, CCM Frontier and HBC. Pursuant to a Contribution and Warrants Purchase Agreement (the "Contribution and Warrants Purchase Agreement"), dated as of August 4, 2026, by and between CCM Frontier and the JV Company, CCM Frontier (i) caused the JV Company to receive the benefit of certain contracts, contacts, investment opportunities, subject matter expertise and other going concern value with respect to the Frontier power platform developed by affiliates of CCM Frontier and (ii) contributed cash and certain assets to the JV Company as detailed in the Contribution and Warrants Purchase Agreement.

Footnote F2

(continued from footnote 1) In exchange therefor and for certain funds previously contributed by CCM Frontier to the JV Company, the JV Company (A) issued to CCM Frontier 50,000,001 Class A-1 Units of the JV Company and 100,000,000 Class A-2 Units of the JV Company and (B) sold and transferred to CCM Frontier warrants (the "JV Warrants") to purchase 20,017,772 shares of Common Stock of the Issuer that were previously contributed to the JV Company by the Issuer. The transfer of the JV Warrants to CCM Frontier was contemplated in the agreement governing the Issuer's contribution of the JV Warrants to the JV Company.

Footnote F3

The JV Warrants are governed by that certain Warrant Agreement, dated as of August 4, 2026, by and between the Issuer and Continental Stock Transfer & Trust Company, as warrant agent (the "Warrant Agreement"). The JV Warrants are immediately exercisable at an exercise price of $5.481 per share of Common Stock and expire on the tenth anniversary of the date of issuance. The JV Warrants may be exercised for cash or on a cashless basis. The Issuer may lower the exercise price and extend the duration of the JV Warrants under certain conditions described in the Warrant Agreement. The Issuer has certain rights to redeem the JV Warrants beginning five years after the date of issuance of the JV Warrants under certain conditions described in the Warrant Agreement. The JV Warrants are subject to customary anti-dilution adjustments as described in the Warrant Agreement.

Footnote F4

The securities of the Issuer reported herein are held directly by CCM Frontier. CCM Frontier Power USA Holdings, LP ("CCM Frontier LP") is the sole member of CCM Frontier. CCM Frontier Power USA Holdings GP, LLC ("CCM Frontier GP") is the general partner of CCM Frontier LP. Cerberus GP Manager LLC ("Cerberus GP Manager", and together with CCM Frontier, CCM Frontier LP, and CCM Frontier GP, the "Reporting Persons") is the sole member of CCM Frontier GP. Due to their relationships with CCM Frontier, CCM Frontier LP, CCM Frontier GP, and Cerberus GP Manager may be deemed to indirectly beneficially own the securities of the Issuer held directly by CCM Frontier. The Reporting Persons are affiliates of and may be deemed to be a Section 13(d) group with CCM Denali Equity Holdings, LP, CCM Denali Equity Holdings GP, LLC and Cerberus Capital Management II, L.P., each of which has previously filed Form 3 and Form 4 filings to report beneficial ownership of securities of the Issuer.

Footnote F5

Each of CCM Frontier LP, CCM Frontier GP and Cerberus GP Manager disclaims beneficial ownership of the securities of the Issuer held directly by CCM Frontier except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of CCM Frontier LP, CCM Frontier GP or Cerberus GP Manager is the beneficial owner of such securities for purposes of Section 16 or any other purpose.

SEC remarks

Nicholas P. Robinson and Nathaniel Fick, each an employee of an affiliate of the Reporting Persons, and David Urban are directors of Eos Energy Enterprises, Inc. (the "Issuer"). By virtue of their representation on the board of directors of the Issuer, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, the Reporting Persons are deemed directors by deputization of the Issuer.