# EDGAR Filing Document

**Accession Number:** 0001805077
**File Stem:** 0001011438-26-000246
**Filing Date:** 2026-4
**Character Count:** 14808
**Document Hash:** 6dfed2758e1907ac189eb33c6187a6d6
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001011438-26-000246.hdr.sgml**: 20260420

**ACCESSION NUMBER**: 0001011438-26-000246

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260420

**DATE AS OF CHANGE**: 20260420

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Eos Energy Enterprises, Inc.
- **CENTRAL INDEX KEY:** 0001805077
- **STANDARD INDUSTRIAL CLASSIFICATION:** MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES [3690]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-91520
- **FILM NUMBER:** 26876285

**BUSINESS ADDRESS:**
- **STREET 1:** 3920 PARK AVENUE
- **CITY:** EDISON
- **STATE:** NJ
- **ZIP:** 08820
- **BUSINESS PHONE:** (732) 225-8400

**MAIL ADDRESS:**
- **STREET 1:** 3920 PARK AVENUE
- **CITY:** EDISON
- **STATE:** NJ
- **ZIP:** 08820

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** B. Riley Principal Merger Corp. II
- **DATE OF NAME CHANGE:** 20200227
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Cerberus Capital Management II, L.P.
- **CENTRAL INDEX KEY:** 0002027951

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**BUSINESS ADDRESS:**
- **STREET 1:** 875 THIRD AVENUE
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
- **BUSINESS PHONE:** 212.891.2100

**MAIL ADDRESS:**
- **STREET 1:** 875 THIRD AVENUE
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 8)**

**Eos Energy Enterprises, Inc.**

*(Name of Issuer)*

**Common Stock, par value $0.0001 per share**

*(Title of Class of Securities)*

**—**

*(CUSIP Number)*

**Alexander D. Benjamin**<br>875 Third Avenue, 11th Floor<br>New York NY 10022<br>(212) 891-2100

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**03/24/2026**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Cerberus Capital Management II, L.P.** | Name of reporting person<br>**Cerberus Capital Management II, L.P.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**159587654.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**159587654.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**159587654.00** | Aggregate amount beneficially owned by each reporting person<br>**159587654.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**32%** | Percent of class represented by amount in Row (11)<br>**32%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IA** | Type of Reporting Person (See Instructions)<br>**IA** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**CCM Denali Equity Holdings, LP** | Name of reporting person<br>**CCM Denali Equity Holdings, LP** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**159587654.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**159587654.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**159587654.00** | Aggregate amount beneficially owned by each reporting person<br>**159587654.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**32%** | Percent of class represented by amount in Row (11)<br>**32%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**CCM Denali Equity Holdings GP, LLC** | Name of reporting person<br>**CCM Denali Equity Holdings GP, LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**159587654.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**159587654.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**159587654.00** | Aggregate amount beneficially owned by each reporting person<br>**159587654.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**32%** | Percent of class represented by amount in Row (11)<br>**32%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, par value $0.0001 per share

**(b) Name of Issuer:**
Eos Energy Enterprises, Inc.

**(c) Address of Issuer's Principal Executive Offices:**
3920 Park Avenue, Edison, NJ, 08820

The following constitutes Amendment No. 8 ("Amendment No. 8") to the Schedule 13D filed with the Securities and Exchange Commission ("SEC") by Cerberus Capital Management II, L.P. ("Cerberus Capital Management II"), CCM Denali Equity Holdings, LP ("CCM Denali Equity") and CCM Denali Equity Holdings GP, LLC ("CCM Denali Equity GP", and together with Cerberus Capital Management II and CCM Denali Equity, the "Reporting Persons") on June 28, 2024, as amended by Amendment No. 1 filed on July 29, 2024, Amendment No. 2 filed on September 3, 2024, Amendment No. 3 filed on September 12, 2024, Amendment No. 4 filed on November 4, 2024, Amendment No. 5 filed on December 17, 2024, Amendment No. 6 filed January 27, 2025, and Amendment No. 7 filed on March 17, 2025.  This Amendment No. 8 amends and supplements the Schedule 13D as specifically set forth herein.

All capitalized terms contained herein but not otherwise defined shall have the meanings ascribed to such terms in the Schedule 13D, as amended. Information given in response to each item shall be deemed incorporated by reference in all other items, as applicable.

**Item 4. Purpose of Transaction**

On March 24, 2026, the Board of Directors of the Issuer (the "Board") appointed Nathaniel Fick, Chief Strategy Officer for Equities and Senior Managing Director of Cerberus Capital Florida, LLC, an affiliate of the Reporting Persons, as a Class III director on the Board. Mr. Fick's term on the Board will last until the Issuer's 2026 Annual Meeting of Stockholders, and if Mr. Fick is elected by a vote of the Issuer's stockholders at such meeting, he will serve for a term of three years or until his successor is elected and qualified. Mr. Fick also has been appointed to the Board's Nominating and Corporate Governance Committee. Mr. Fick was not selected as a director pursuant to any arrangement or understandings between the Issuer and the Reporting Persons, including any previously disclosed agreements. 

In addition, on April 30, May 28, May 29, July 29, November 18 and November 19, 2025, the Issuer entered into amendments to the previously disclosed Credit Agreement, pursuant to which, among other things, the measurement period for achieving sales milestones was extended. On October 31, 2025, the Issuer satisfied its final performance milestones pursuant to the terms of the Credit Agreement and therefore no additional securities of the Issuer are contemplated to be issued to the Reporting Persons in connection with the Credit Agreement at this time.

**Item 5. Interest in Securities of the Issuer**

**(a)**
The only change in the Reporting Persons' beneficial ownership of securities of the Issuer since Amendment No. 7 to this Schedule 13D was an increase in the number of shares of Common Stock of the Issuer issuable upon conversion of the Series B-4 Preferred Stock that resulted solely from an antidilution adjustment made pursuant to the terms of the Series B-4 Preferred Stock. Each of the Reporting Persons may be deemed to beneficially own 159,587,654 shares of Common Stock, which amount includes 43,276,194 shares of Common Stock of the Issuer issuable upon exercise of the Warrant (as defined in Item 4 in the original Schedule 13D and subject to the limitations as described therein), 31,940,063 shares of Common Stock of the Issuer issuable upon conversion of 31.940063 shares of Series B-1 Preferred Stock, 28,806,463 shares of Common Stock of the Issuer issuable upon conversion of 28.806463 shares of Series B-2 Preferred Stock, 38,259,864 shares of Common Stock of the Issuer issuable upon conversion of 38.259864 shares of Series B-3 Preferred Stock, and 17,305,070 shares of Common Stock of the Issuer issuable upon conversion of 16.150528 shares of Series B-4 Preferred Stock. Such amount of beneficial ownership represents approximately 32.0% of the Common Stock outstanding, based on 339,459,024 shares of Common Stock outstanding as of March 20, 2026, as reported in the Issuer's Proxy Statement filed with the Securities and Exchange Commission on April 14, 2026. The securities of the Issuer reported herein are directly held and beneficially owned by CCM Denali Equity.  CCM Denali Equity GP, as the general partner of CCM Denali Equity, may be deemed to beneficially own the securities of the Issuer held by CCM Denali Equity. Cerberus Capital Management II, as the sole member of CCM Denali Equity GP, may be deemed to beneficially own the securities of the Issuer held by CCM Denali Equity.

**(b)**
Items 7 through 10 of each of the cover pages of this Schedule 13D are incorporated herein by reference.  Each of the Reporting Persons may be deemed to have sole voting power and sole dispositive power over 159,587,654 shares of Common Stock. The information in Item 5(a) above is incorporated herein by reference.

**(c)**
There have been no transactions by the Reporting Persons or the Scheduled Persons in the securities of the Issuer during the past sixty days.

**Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.**

Item 6 is hereby amended and supplemented by the addition of the following:

The disclosure in Item 4 is incorporated herein by reference.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Cerberus Capital Management II, L.P.

**Signature:** /s/ Alexander D. Benjamin

**Name/Title:** Alexander D. Benjamin/Senior Managing Director and Chief Legal Officer

**Date:** 04/20/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** CCM Denali Equity Holdings, LP

**Signature:** /s/ Alexander D. Benjamin

**Name/Title:** Alexander D. Benjamin/Manager, CCM Denali Equity Holdings GP, LLC, its general partner

**Date:** 04/20/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** CCM Denali Equity Holdings GP, LLC

**Signature:** /s/ Alexander D. Benjamin

**Name/Title:** Alexander D. Benjamin/Manager

**Date:** 04/20/2026