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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-K
(Amendment No. 1)
☒ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the fiscal year ended: December 31, 2023
☐
TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
EOS ENERGY ENTERPRISES, INC.
Delaware001-3929184-4290188
(State or other jurisdiction
of incorporation)		(Commission
File Number)		(IRS Employer
Identification No.)
3920 Park Avenue
Edison, New Jersey 08820
(Address of principal executive offices, including zip code)
Registrant’s telephone number, including area code: (732) 225-8400
Securities registered pursuant to Section 12(b) of the Act:
Title of each classTrading Symbol(s)Name of each exchange on which registered
Common stock, par value $0.0001 per shareEOSEThe Nasdaq Stock Market LLC
Warrants, each exercisable for one share of common stockEOSEWThe Nasdaq Stock Market LLC
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☐ No ☒

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes ☐ No ☒

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer a smaller reporting company or an emerging growth company. See the definitions of the “large accelerated filer,” “accelerated filer,” “non-accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer
☐
Accelerated filer
☐
Non-accelerated filer
☒
Smaller reporting company
☒
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. ☐

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. Yes ☐ No ☒

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. ☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b). ☐

Indicate by check mark whether registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes ☐ No ☒

The aggregate market value of the voting stock held by non-affiliates of the registrant as of the last business day of the registrant’s most recently completed second fiscal quarter, June 30, 2023, was approximately $522.2 million based upon the closing sale price of our common stock of $4.34 on that date. As of February 27, 2024, there were 202,645,716 shares of the registrant’s common stock issued and outstanding.


DOCUMENTS INCORPORATED BY REFERENCE
None.


Deloitte & Touche LLP, New York, NY (PCAOB ID: 34)



EXPLANATORY NOTE

On March 4, 2024, Eos Energy Enterprises, Inc. (the “Company”) filed with the Securities and Exchange Commission its Annual Report on Form 10-K for the year ended December 31, 2023 (the “Original Form 10-K”).
This Amendment No. 1 to Form 10-K (“Amendment”) of the Company is being filed solely to amend Item 15(a)(3) and Exhibit 23.1 to include an updated consent of Deloitte & Touche LLP, the Company’s independent registered public accounting firm, to include references to certain registration statements of the Company which were inadvertently omitted from the original consent filed.
This Amendment should be read in conjunction with the Original Form 10-K and includes only the portions of the Company’s Annual Report on Form 10-K being supplemented or amended by this Form 10-K/A. Other than as described in this explanatory note, this Amendment does not change any of the financial or other information set forth in the Original Form 10-K or the exhibits thereto. This Amendment does not reflect events that may have occurred subsequent to the filing of the Original Form 10-K.


PART IV
ITEM 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
(3) Exhibits. Filed as part of this Annual Report are the following exhibits:
Incorporated by Reference
Exhibit NumberDescription of DocumentSchedule/FormFile NumberExhibit Filing date
2.1Form 8-K
File No. 001-39291
2.1
September 8, 2020
3.1Form 10-KFile No. 001-392913.1February 28, 2023
3.2Form 8-K
File No. 001-39291
3.2
May 19, 2022
4.1Form 8-K
File No. 001-39291
4.1
November 20, 2020
4.2Form 8-K
File No. 001-39291
4.2
November 20, 2020
4.3Form 8-K
File No. 001-39291
4.1
July 7, 2021
4.4Form 8-K
File No. 001-39291
4.1
May 22, 2020
4.5Form 10-KFile No. 001-392914.5February 25, 2022


Incorporated by Reference
Exhibit NumberDescription of DocumentSchedule/FormFile NumberExhibit Filing date
4.6Form 8-KFile No. 001-3929110.1April 13, 2022
4.7Form 8-KFile No. 001-392914.1June 13, 2022
4.8Form 8-K
File No. 001-39291
4.1
December 29, 2022
4.9Form 8-KFile No. 001-392914.1January 19, 2023
4.10Form 8-KFile No. 001-392914.1February 02, 2023
4.11Form 8-KFile No. 001-392914.1March 17, 2023
4.12Form 8-KFile No. 001-392914.1April 11, 2023
4.13Form 8-KFile No. 001-392914.1April 14, 2023
4.14Form 8-KFile No. 001-392914.1May 17, 2023
4.15Form 8-KFile No. 001-392914.1May 25, 2023


Incorporated by Reference
Exhibit NumberDescription of DocumentSchedule/FormFile NumberExhibit Filing date
4.16Form 8-KFile No. 001-392914.2May 25, 2023
4.17Form 8-KFile No. 001-392914.1December 15, 2023
10.1Form 8-K
File No. 001-39291
10.8
November 20, 2020
10.2Form 8-K
File No. 001-39291
10.10
November 20, 2020
10.3Form 8-K
File No. 001-39291
10.13
November 20, 2020
10.4Form 8-K
File No. 001-39291
99.1March 2, 2021
10.5Form 8-KFile No. 001-3929110.1March 12, 2021
10.6Form 8-KFile No. 001-3929110.1March 31, 2021
10.7Form 8-KFile No. 001-3929110.1April 14, 2021
10.8Form 8-KFile No. 001-3929110.2April 14, 2021
10.9Form 8-KFile No. 001-392914.01May 10, 2021
10.10Form 8-KFile No. 001-392914.02May 10, 2021


Incorporated by Reference
Exhibit NumberDescription of DocumentSchedule/FormFile NumberExhibit Filing date
10.11Form 8-KFile No. 001-3929110.1July 7, 2021
10.12Form 8-KFile No. 001-3929110.1October 5, 2021
10.13Form 8-KFile No. 001-3929110.2October 5, 2021
10.14Form 8-KFile No. 001-3929110.01December 14, 2021
10.15Form 8-KFile No. 001-3929110.02December 14, 2021
10.16Form 8-KFile No. 001-3929110.1February 14, 2022
10.17Form 8-KFile No. 001-3929110.1April 28, 2022
10.18Form 10-QFile No. 001-3929110.3May 9, 2022
10.19Form 8-KFile No. 001-3929110.1June 13, 2022
10.20Form 8-KFile No. 001-3929110.2June 13, 2022


Incorporated by Reference
Exhibit NumberDescription of DocumentSchedule/FormFile NumberExhibit Filing date
10.21Form 8-KFile No. 001-3929110.1August 1, 2022
10.22Form 8-KFile No. 001-3929110.2August 1, 2022
10.23Form 8-KFile No. 001-3929110.1August 5, 2022
10.24Form 8-KFile No. 001-3929110.2August 5, 2022
10.25Form 8-KFile No. 001-3929110.1September 9, 2022
10.27Form 8-KFile No. 001-3929110.1December 8, 2022
10.30Form 8-KFile No. 001-3929110.1January 20, 203
10.31Form 8-KFile No. 001-3929110.2January 20, 203


Incorporated by Reference
Exhibit NumberDescription of DocumentSchedule/FormFile NumberExhibit Filing date
10.32Form 8-KFile No. 001-3929110.1January 19, 2023
10.33Form 8-KFile No. 001-3929110.2January 19, 2023
10.38
Form 8-KFile No. 001-3929110.1April 14, 2023
10.39
Form 8-KFile No. 001-3929110.1May 17, 2023
10.40Form 8-KFile No. 001-3929110.1August 23, 2023
10.41Form 8-KFile No. 001-3929110.2August 23, 2023
10.42Form 8-KFile No. 001-3929110.1August 28, 2023
10.43**
10.44**
21.1
Form 10-K
File No. 001-3929121.1February 28, 2023
23.1*


Incorporated by Reference
Exhibit NumberDescription of DocumentSchedule/FormFile NumberExhibit Filing date
24.1**
31.1*
31.2*
32.1**+
32.2**+
97**
101.SCH**XBRL Taxonomy Extension Schema Document
101.CAL**XBRL Taxonomy Extension Calculation Linkbase Document
101.LAB**XBRL Taxonomy Extension Label Linkbase Document
101.PRE**XBRL Taxonomy Extension Presentation Linkbase Document
101.DEF**XBRL Taxonomy Extension Definition Linkbase Document
104*Inline XBRL for the cover page of this Annual Report on Form 10-K, included in the Exhibit 101 Inline XBRL Document Set


Incorporated by Reference
Exhibit NumberDescription of DocumentSchedule/FormFile NumberExhibit Filing date
†Certain of the exhibits and schedules to this Exhibit have been omitted in accordance with Regulation S-K Item 601(a)(5). The Registrant agrees to furnish a copy of all omitted exhibits and schedules to the SEC upon its request.
*Filed herewith.
**Previously filed.
+The certifications furnished in Exhibit 32.1 and Exhibit 32.2 hereto are deemed to accompany this Annual Report on Form 10-K and will not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, except to the extent that the registrant specifically incorporates it by reference.


SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this Report to be signed on its behalf by the undersigned, thereunto duly authorized in the City of Edison, State of New Jersey, on March 7, 2024.

EOS ENERGY ENTERPRISES, INC.
By: /s/ Nathan Kroeker
   Chief Financial Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated:

NamePositionDate
/s/ Joseph MastrangeloChief Executive Officer and DirectorMarch 7, 2024
Joseph Mastrangelo(Principal Executive Officer)
/s/ Nathan KroekerChief Financial OfficerMarch 7, 2024
Nathan Kroeker(Principal Financial Officer)
/s/ Sumeet PuriChief Accounting OfficerMarch 7, 2024
Sumeet Puri
(Principal Accounting Officer)
*DirectorMarch 7, 2024
Jeffrey Bornstein
*DirectorMarch 7, 2024
Alex Dimitrief
*DirectorMarch 7, 2024
Claude Demby
*DirectorMarch 7, 2024
Jeffrey McNeil
*DirectorMarch 7, 2024
Russell Stidolph
*DirectorMarch 7, 2024
Marian "Mimi" Walters
*DirectorMarch 7, 2024
Audrey Zibelman

*By:/s/ Joseph Mastrangelo
Joseph Mastrangelo
Attorney-in-Fact


CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in Registration Statement Nos. 333-275863, 333-272754, and 333-263298 on Form S-3 and Registration Statement Nos. 333-272848, 333-265708, and 333-256766 on Form S-8 of our report dated March 4, 2024, relating to the financial statements of Eos Energy Enterprises, Inc. appearing in this Annual Report on Form 10-K for the year ended December 31, 2023.

/s/ Deloitte & Touche LLP

New York, NY
March 4, 2024


CERTIFICATION OF CHIEF EXECUTIVE OFFICER
PURSUANT TO
RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,
AS ADOPTED PURSUANT TO
SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Joseph Mastrangelo, certify that:
1. I have reviewed this Amendment No. 1 to the Annual Report on Form 10-K (the “Amendment”) of Eos Energy Enterprises, Inc.; and
2. Based on my knowledge, this Amendment does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this Amendment.

DateMarch 7, 2024/s/ Joseph Mastrangelo
Joseph Mastrangelo
Chief Executive Officer
(Principal Executive Officer)


CERTIFICATION OF CHIEF FINANCIAL OFFICER
PURSUANT TO
RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,
AS ADOPTED PURSUANT TO
SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Nathan Kroeker, certify that:
1. I have reviewed this Amendment No. 1 to the Annual Report on Form 10-K (the “Amendment”) of Eos Energy Enterprises, Inc.; and
2. Based on my knowledge, this Amendment does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this Amendment.

DateMarch 7, 2024
/s/ Nathan Kroeker

Nathan Kroeker
Chief Financial Officer
(Principal Financial Officer)

v3.24.0.1
Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Feb. 27, 2024
Jun. 30, 2023
Entity Information [Line Items]      
Document Type 10-K/A    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity Registrant Name EOS ENERGY ENTERPRISES, INC.    
Entity Incorporation, State or Country Code DE    
Entity File Number 001-39291    
Entity Tax Identification Number 84-4290188    
Entity Address, Address Line One 3920 Park Avenue    
Entity Address, City or Town Edison    
Entity Address, State or Province NJ    
Entity Address, Postal Zip Code 08820    
City Area Code 732    
Local Phone Number 225-8400    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 522.2
Entity Common Stock, Shares Outstanding   202,645,716  
Entity Central Index Key 0001805077    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false    
Common stock, par value $0.0001 per share      
Entity Information [Line Items]      
Title of 12(b) Security Common stock, par value $0.0001 per share    
Trading Symbol EOSE    
Security Exchange Name NASDAQ    
Warrants, each exercisable for one share of common stock      
Entity Information [Line Items]      
Title of 12(b) Security Warrants, each exercisable for one share of common stock    
Trading Symbol EOSEW    
Security Exchange Name NASDAQ    
v3.24.0.1
Audit Information
 12 Months Ended
Dec. 31, 2023
Audit Information [Abstract]  
Auditor Name Deloitte & Touche LLP
Auditor Location New York, NY
Auditor Firm ID 34
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