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 * GALLAGHER DENNIS M. 2. Issuer Name and Ticker or Trading Symbol Hyliion Holdings Corp. [ HYLN ] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable)_____ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
Chief Operating Officer
(Last)         (First)         (Middle)
C/O HYLIION HOLDINGS CORP., 1202 BMC DRIVE, SUITE 100		 3. Date of Earliest Transaction (MM/DD/YYYY)
9/17/2021
(Street)
CEDAR PARK, TX 78613
(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  9/17/2021    A(1)    23532  A $0  23532  D   
Common Stock  9/17/2021    A(2)    70435  A $0  93967  D   

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 Reporting Person received a grant of restricted stock units ("RSU Award") pursuant to the Issuer's 2020 Equity Incentive Plan. The RSU Award fully vests upon the grant date.
(2)  The Reporting Person received an RSU Award pursuant to the Issuer's 2020 Equity Incentive Plan. One-third (1/3) of the RSU Award will vest on September 17, 2022 and the remaining two-thirds (2/3) of the RSU Award will vest quarterly in equal amounts over a two-year period thereafter.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
GALLAGHER DENNIS M.
C/O HYLIION HOLDINGS CORP.
1202 BMC DRIVE, SUITE 100
CEDAR PARK, TX 78613

Chief Operating Officer

Signatures
/s/ Dennis M. Gallagher 9/21/2021
**Signature of Reporting Person Date
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