[Form 4/A] Hyliion Holdings Corp. Amended Insider Trading Activity

Rhea-AI Filing Summary

Hyliion Holdings Corp. (HYLN) insider Jose Miguel Oxholm, the company’s Chief Legal & Compliance Officer, filed an amended Form 4 to correct a prior report. The amendment removes an earlier reference to common shares allegedly withheld to cover taxes on a transaction dated 08/25/2025, which the company’s third-party service provider had reported in error.

The filing clarifies that no shares were actually withheld on 08/25/2025, and updates the record to show that Oxholm directly beneficially owns 813,512 shares of common stock following the reported transaction.

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).

1. Name and Address of Reporting Person^*

Oxholm Jose Miguel

(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 Legal&Compliance Officer

3. Date of Earliest Transaction (Month/Day/Year)
08/25/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)
08/25/2025

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	08/25/2025		F(1)		0	D	$0	813,512	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. This Amended Form 4 has been filed to delete a reference to shares withheld to satisfy taxes on the reporting person's Form 4 filed with the SEC on August 25, 2025. The shares were initially reported as withheld as a result of an administrative error by the issuer's third party service provider. No shares were withheld on August 25, 2025 and Column 5 of Table 1 has been revised accordingly.

Remarks:

	/s/ Jose Miguel Oxholm	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.

FAQ

What does the Hyliion (HYLN) Form 4/A amendment report?

The Form 4/A for Hyliion Holdings Corp. (HYLN) corrects a prior Form 4 by deleting a mistaken reference to shares withheld to satisfy taxes on a transaction reported on 08/25/2025.

Why was Hyliion’s insider Form 4 for HYLN corrected?

The amendment states that shares were initially reported as withheld due to an administrative error by the issuer’s third-party service provider, and clarifies that no shares were withheld on 08/25/2025.

How many Hyliion (HYLN) shares does the reporting officer now show as owning?

After the correction, the Form 4/A reports that the officer beneficially owns 813,512 shares of Hyliion common stock, held as direct ownership.

Who is the reporting person in this Hyliion (HYLN) Form 4/A filing?

The reporting person is Jose Miguel Oxholm, who serves as Hyliion’s Chief Legal & Compliance Officer and is an officer of the company.

Does this Hyliion (HYLN) Form 4/A reflect any new stock transactions?

The Form 4/A does not introduce new transactions; it revises the earlier disclosure to show that no shares were withheld for taxes on 08/25/2025 and updates the beneficial ownership accordingly.

What transaction date is referenced in the Hyliion (HYLN) Form 4/A?

The amendment refers to a previously reported transaction with an earliest transaction date of 08/25/2025, for which the tax withholding entry has now been removed.