[Form 4] Hyliion Holdings Corp. Insider Trading Activity

Rhea-AI Filing Summary

Hyliion Holdings Corp. (HYLN) reported an insider equity update for its Chief Financial Officer, Jon Panzer. On 11/13/2025, 5,226 shares of common stock and on 11/14/2025, 9,406 shares were disposed of at prices of $1.68 and $1.70 per share, respectively. These dispositions were not open-market sales but shares withheld to cover a tax liability arising from the vesting and distribution of restricted stock units.

After these transactions, Panzer directly beneficially owned 892,225 shares of Hyliion common stock. The filing indicates this was a routine tax-related adjustment to his equity holdings, with no derivative securities reported in Table II.

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^*

Panzer Jon

(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 Financial Officer

3. Date of Earliest Transaction (Month/Day/Year)
11/13/2025

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	11/13/2025		F(1)		5,226	D	$1.68	901,631	D
Common Stock	11/14/2025		F(1)		9,406	D	$1.7	892,225	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/ Jon Panzer	11/17/2025
	** 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 does this Hyliion (HYLN) Form 4 filing report?

The Form 4 reports that Hyliion Holdings Corp. Chief Financial Officer Jon Panzer had shares of common stock withheld to satisfy a tax liability related to the vesting and distribution of restricted stock units.

How many Hyliion (HYLN) shares did the CFO dispose of?

The filing shows dispositions of 5,226 shares of common stock on 11/13/2025 at $1.68 per share and 9,406 shares on 11/14/2025 at $1.70 per share.

Why were Hyliion shares disposed of in this Form 4?

The explanation states that the shares were withheld for the payment of a tax liability related to the vesting and distribution of restricted stock units, rather than being sold in the open market.

How many Hyliion (HYLN) shares does the CFO own after these transactions?

After the reported transactions, Jon Panzer beneficially owned 892,225 shares of Hyliion common stock in direct ownership.

Does this Hyliion Form 4 include any derivative securities like options or warrants?

Table II, which covers derivative securities, shows no entries, indicating no derivative securities were reported in connection with these transactions.

What is the relationship of the reporting person to Hyliion (HYLN)?

The reporting person, Jon Panzer, is identified as an officer of Hyliion Holdings Corp., serving as the company’s Chief Financial Officer.