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 * NIGGLI MICHAEL R 2. Issuer Name and Ticker or Trading Symbol ESS Tech, Inc. [ GWH ] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable)__X__ Director                    _____ 10% Owner
_____ Officer (give title below)    _____ Other (specify below)
(Last)          (First)          (Middle)
C/O ESS TECH, INC., 26440 SW PARKWAY AVE., BLDG. 83		 3. Date of Earliest Transaction (MM/DD/YYYY)
12/15/2022
(Street)
WILSONVILLE, OR 97070
(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
Common Stock  12/15/2022    P    19100  A $2.56 (1) 578821  D   
Common Stock                 568312  I  See footnote (2)
Common Stock                 227407  I  See footnote (3)
Common Stock                 85228  I  See footnote (4)
Common Stock                 85228  I  See footnote (5)
Common Stock                 85228  I  See footnote (6)
Common Stock                 85228  I  See footnote (7)

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 Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. 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 Date 7. 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)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Explanation of Responses:
(1)  The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.545 to $2.58, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price.
(2)  The shares are held of record by the Linda Naviaux Niggli Trust for which the reporting person's spouse serves as trustee.
(3)  The shares are held of record by the Michael R. Niggli Family Trust for which the reporting person serves as trustee.
(4)  The shares are held of record by the Michael R. Niggli Jr. 2021 Gift Trust for which the reporting person serves as trustee.
(5)  The shares are held of record by the Chloe D. Niggli Gift Trust for which the reporting person serves as trustee.
(6)  The shares are held of record by the Ian M. Niggli 2021 Gift Trust for which the reporting person serves as trustee.
(7)  The shares are held of record by the Lorelei A. Niggli 2021 Gift Trust for which the reporting person serves as trustee.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
NIGGLI MICHAEL R
C/O ESS TECH, INC.
26440 SW PARKWAY AVE., BLDG. 83
WILSONVILLE, OR 97070		 X



Signatures
/s/Kelly F. Goodman, by power of attorney for Michael R. Niggli 12/16/2022
**Signature of Reporting Person Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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