FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Mastrangelo Joe
2. Issuer Name and Ticker or Trading Symbol

Eos Energy Enterprises, Inc. [ EOSE ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__X__ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
Chief Executive Officer
(Last)          (First)          (Middle)

C/O EOS ENERGY ENTERPRISES, INC., 3920 PARK AVENUE
3. Date of Earliest Transaction (MM/DD/YYYY)

2/26/2021
(Street)

EDISON, NJ 08820
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security3. Trans. Date3A. Deemed Execution Date, if any4. Trans. Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
6. Date Exercisable and Expiration Date7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Restricted Stock Units  (1)2/26/2021  A   750000     (2) (2)Common Stock 750000.0 $0 750000 D  

Explanation of Responses:
(1) Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock
(2) (2)The reporting person received a grant of RSUs under the Issuer's 2020 Incentive Plan, as amended from time to time, which will vest in three equal installments on each of January 3, 2022, January 2, 2023 and January 1, 2024, subject to continued service through each vesting date.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
Mastrangelo Joe
C/O EOS ENERGY ENTERPRISES, INC.
3920 PARK AVENUE
EDISON, NJ 08820
X
Chief Executive Officer

Signatures
/s/ Joe Mastrangelo3/2/2021
**Signature of Reporting PersonDate

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