Hyliion Holdings Corp. (HYLN) CAO Discloses Tax-Related Sale of 4,010 Shares

Rhea-AI Filing Summary

Hyliion Holdings Corp. reported an insider share transaction by its chief accounting officer, Greg Standley. On 12/12/2025, he disposed of 4,010 shares of common stock at $1.94 per share.

According to the disclosure, the shares were sold at the direction of the issuer under an award agreement to cover the reporting person’s tax withholding obligations. After this transaction, Standley directly beneficially owned 221,888 shares of Hyliion common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Standley Greg

Role Chief Accounting Officer.

Type	Security	Shares	Price	Value
Other	Common Stock	4,010	$1.94	$8K

Holdings After Transaction: Common Stock — 221,888 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Standley Greg

(Last) (First) (Middle)

C/O HYLIION HOLDING CORP.

1202 BMC DRIVE, SUITE 100

(Street)

CEDAR PARK TX 78613

(City) (State) (Zip)

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 Accounting Officer.

3. Date of Earliest Transaction (Month/Day/Year)
12/12/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

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. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction 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	12/12/2025		J(1)		4,010	D	$1.94	221,888	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction 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 (Month/Day/Year)		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: 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. These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

Remarks:

	/s/ Greg Standley	12/15/2025
	** 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 Number.

FAQ

What insider transaction did Hyliion Holdings Corp. (HYLN) disclose in this Form 4?

The filing reports that chief accounting officer Greg Standley disposed of 4,010 shares of Hyliion common stock in a single transaction on 12/12/2025.

How many HYLN shares did Greg Standley sell and at what price?

Greg Standley sold 4,010 shares of Hyliion common stock at a price of $1.94 per share.

Why were the Hyliion (HYLN) shares sold by the chief accounting officer?

The filing states that the shares were sold at the direction of the issuer under an award agreement so that shares could be sold to cover the reporting person’s tax withholding obligations.

How many Hyliion (HYLN) shares does Greg Standley own after this transaction?

Following the reported sale, Greg Standley beneficially owned 221,888 shares of Hyliion common stock, held as a direct ownership position.

What is Greg Standley’s relationship to Hyliion Holdings Corp. (HYLN)?

Greg Standley is listed as an officer of Hyliion Holdings Corp., serving as its Chief Accounting Officer, and is not identified as a director or 10% owner in this filing.

Is this Hyliion (HYLN) Form 4 filed for one person or multiple reporting persons?

The disclosure indicates that the Form 4 is filed by one reporting person, not by more than one reporting person.