Hyliion CAO reports 2,275-share RSU tax withholding on Form 4

Rhea-AI Filing Summary

Hyliion Holdings Corp. Chief Accounting Officer Greg Standley reported an automatic share withholding related to equity compensation. On 11/14/2025, 2,275 shares of Hyliion common stock were disposed of at $1.70 per share under transaction code “F,” which indicates shares were withheld to cover tax liabilities from the vesting and distribution of restricted stock units. After this tax withholding event, Standley beneficially owns 226,417 shares of Hyliion common stock directly.

Insider Trade Summary

Net Seller: 2,275 shares

Net Sell 1 txn

Insider Standley Greg

Role Chief Accounting Officer.

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	2,275	$1.70	$4K

Holdings After Transaction: Common Stock — 226,417 shares (Direct)

Footnotes (1)

1. F1. Shares withheld for the payment of a tax liability related to the vesting and distribution of restricted stock units.

FAQ

What did Hyliion (HYLN) disclose in this Form 4 filing?

The filing shows that Chief Accounting Officer Greg Standley had 2,275 shares of Hyliion common stock withheld on 11/14/2025 to cover taxes from a restricted stock unit vesting.

How many Hyliion (HYLN) shares were involved in the reported transaction?

The Form 4 reports a disposition of 2,275 shares of Hyliion common stock at a price of $1.70 per share.

Why were 2,275 Hyliion (HYLN) shares disposed of by the officer?

According to the explanation, the 2,275 shares were withheld for the payment of a tax liability related to the vesting and distribution of restricted stock units, reflected by transaction code “F”.

How many Hyliion (HYLN) shares does the reporting person own after this transaction?

Following the reported tax withholding, Greg Standley beneficially owns 226,417 shares of Hyliion common stock, held directly.

Who is the insider reporting this Hyliion (HYLN) Form 4 transaction and what is their role?

The reporting person is Greg Standley, who serves as Chief Accounting Officer of Hyliion Holdings Corp.

Was this Hyliion (HYLN) Form 4 transaction an open-market sale?

No. The Form 4 identifies the transaction with code “F” and explains that shares were withheld to pay taxes on restricted stock unit vesting, rather than sold in an open-market trade.

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Form 4 Insider Transactions: What Each Field Means →

Accepted by SEC EDGAR 11/18/2025 - 05:05 PM Learn about SEC filing dates

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)
11/14/2025

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	11/14/2025		F(1)		2,275	D	$1.7	226,417	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	11/18/2025
	** 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.