[Form 4] Hyliion Holdings Corp. Insider Trading Activity

Rhea-AI Filing Summary

Greg Standley, Chief Accounting Officer of Hyliion Holdings Corp. (HYLN) reported a transaction on 08/12/2025 where 2,781 shares of common stock were disposed of at $1.69 per share. The filing states these shares were withheld to satisfy a tax liability arising from the vesting and distribution of restricted stock units. After the withholding, Mr. Standley beneficially owned 232,052 shares, held directly. The Form 4 was signed on 08/14/2025 and identifies the sale as a routine tax-withholding action tied to equity compensation rather than an open-market trade.

Insights

Financial Analyst

TL;DR Insider withheld 2,781 shares to cover taxes on vested RSUs; the change is small relative to total holdings.

The reported disposal of 2,781 shares at $1.69 each is described as tax withholding for vested restricted stock units, a common administrative liquidity event that does not necessarily indicate a change in the officer's view of the company. The post-transaction beneficial ownership of 232,052 shares remains substantial for an individual officer but the absolute disposal size is modest. There is no indication of additional sales or a change in compensation structure in this filing.

Corporate Governance Expert

TL;DR Transaction is administrative (tax withholding) and routine; no governance red flags evident from this single Form 4.

The Form 4 clearly states the shares were withheld to satisfy a tax liability from RSU vesting, which is standard practice and typically disclosed this way. The filing shows direct ownership and an executed signature, meeting disclosure requirements. Absent concurrent unusual sales or related-party transactions, this report aligns with expected executive equity compensation mechanics and raises no immediate governance concerns.

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

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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)
08/12/2025

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	08/12/2025		F(1)		2,781	D	$1.69	232,052	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	08/14/2025
	** 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 did Greg Standley of HYLN report on Form 4?

He reported the disposal of 2,781 common shares on 08/12/2025 at $1.69 per share, withheld to pay a tax liability from vested RSUs.

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

Following the transaction he beneficially owned 232,052 shares, held directly.

Was the Form 4 sale an open-market transaction or for tax withholding?

The filing explains the shares were withheld for payment of a tax liability related to the vesting and distribution of restricted stock units.

When was the Form 4 signed by the reporting person?

The Form 4 bears the reporting person's signature dated 08/14/2025.

What price per share was reported for the disposed HYLN shares?

The price reported for the disposed shares was $1.69 per share.