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
                                                                                  
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response...
0.5
                      
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 * OLKKOLA EDWARD E 2. Issuer Name and Ticker or Trading Symbol Hyliion Holdings Corp. [ HYLN ] 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 HYLIION HOLDINGS CORP., 1202 BMC DRIVE, SUITE 100
3. Date of Earliest Transaction (MM/DD/YYYY)
9/24/2021
(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  9/24/2021    M    100000  A $0.086  931610  D   
Common Stock  10/1/2021    S    100000 (1) D $8.13 (2) 831610  D   
Common Stock                 166560  I  By Spouse 

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
Stock Option (Right to Buy)  $0.086  9/24/2021    M        100000    (3) 8/28/2026  Common Stock  $100000   (4) 692901  D   

Explanation of Responses:
(1)  The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.
(2)  The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.00 to $8.49, inclusive. Full information regarding the number of shares sold at each separate price will be provided upon request by the SEC staff, the issuer, or any security holder of the issuer.
(3)  The option became exercisable in equal quarterly installments over 4 years beginning on August 29, 2016.
(4)  The option was received in exchange for an option to purchase 750,000 shares of Hyliion Inc. ("Legacy Hyliion") common stock pursuant to the Business Combination Agreement and Plan of Reorganization, dated as of June 18, 2020, by and among Tortoise Acquisition Corp. ("Tortoise"), Legacy Hyliion and SHLL Merger Sub Inc., a wholly-owned subsidiary of Tortoise ("Merger Sub"), pursuant to which Merger Sub merged with and into Legacy Hyliion, with Legacy Hyliion surviving the merger as a wholly-owned subsidiary of Tortoise (which subsequently changed its name to "Hyliion Holdings Corp.").

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



Signatures
/s/ Edward E. Olkkola 10/5/2021
**Signature of Reporting Person Date
Hyliion (NYSE:HYLN)
Historical Stock Chart
From Dec 2021 to Jan 2022 Click Here for more Hyliion Charts.
Hyliion (NYSE:HYLN)
Historical Stock Chart
From Jan 2021 to Jan 2022 Click Here for more Hyliion Charts.