[Form 4] Hyliion Holdings Corp. Insider Trading Activity

Rhea-AI Filing Summary

Hyliion Holdings Corp. insider Greg Standley, who serves as the companys Chief Accounting Officer and an officer of the issuer, reported a common stock transaction dated 08/06/2025. The Form 4 shows 6,307 shares were withheld to satisfy a tax liability arising from the vesting and distribution of restricted stock units, reported under transaction code F(1). The withholding used a per-share value of $1.51.

After the withholding, Mr. Standley beneficially owned 234,833 shares of Hyliion common stock on a direct basis. The filing shows no derivative transactions and was submitted by a single reporting person.

Positive

• Tax withholding disclosure is explicit: 6,307 shares withheld to satisfy taxes on vested RSUs (transaction code F(1)).
• Beneficial ownership updated in the filing: reporting person holds 234,833 shares directly after the transaction.

Negative

• None.

Insights

Securities Analyst

Routine RSU tax-withholding; no open-market sale or derivative activity reported.

The Form 4 records a tax-withholding disposition of 6,307 shares at a reported value of $1.51 tied to the vesting and distribution of restricted stock units (transaction code F(1)). The filing discloses that the reporting person retains 234,833 shares directly following the withholding. This is a standard, non-dispositive corporate compensation settlement and there are no disclosed option exercises, sales, or derivative positions on Table II.

Corporate Governance Expert

Disclosure aligns with routine insider reporting and specifies the nature of the withholding.

The filing identifies Greg Standley as an officer (Chief Accounting Officer) and uses the appropriate transaction code F(1) with an explanatory note stating shares were withheld to pay a tax liability on vested RSUs. The Form 4 is filed by one reporting person and lists direct beneficial ownership after the transaction as 234,833 shares. The disclosure is clear on the transaction purpose and ownership impact within the document.

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
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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)
08/06/2025

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	08/06/2025		F(1)		6,307	D	$1.51	234,833	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. Shares withheld for the payment of a tax liability related to the vesting and distribution of restricted stock units.

Remarks:

	/s/ Greg Standley	08/08/2025
	** 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 transaction did Greg Standley report on Form 4 for HYLN?

The Form 4 reports that 6,307 shares were withheld to satisfy a tax liability related to the vesting and distribution of restricted stock units on 08/06/2025.

What transaction code is used and what does it mean on the HYLN Form 4?

The filing uses transaction code F(1), which the document explains as shares withheld for payment of a tax liability tied to vested RSUs.

How many Hyliion shares does Greg Standley own after the reported transaction?

Following the withholding, the filing shows 234,833 shares beneficially owned on a direct basis.

Was any derivative or option activity reported on this Form 4 for HYLN?

No. Table II of the Form 4 shows no derivative securities acquired, disposed of, or beneficially owned.

Is this Form 4 a joint filing or filed by one person?

The Form 4 was filed by one reporting person, as indicated in the document.