Hyliion insider tax-withholding sale: 31,105 shares disclosed in Form 4

Rhea-AI Filing Summary

Hyliion Holdings Corp. insider filing reports a routine tax-related share sale. The company’s Chief Legal & Compliance Officer, Jose Miguel Oxholm, sold 31,105 shares of Hyliion common stock on 11/17/2025 at a price of $1.66 per share. These shares were sold at the direction of the issuer under the terms of an award agreement, which allows the issuer to decide whether to sell shares to cover the officer’s tax withholding obligations.

The filing explains that this sale includes shares used to cover tax withholding for equity awards vesting on August 25, November 13, and November 14, 2025. Due to an administrative error by a third-party service provider, cash was initially used to cover the August 25 tax obligation, and the related share sale could not occur until the next open trading window. As a result, the portion of shares tied to the August 25 vesting was sold on November 17, 2025. After this transaction, the officer beneficially owned 779,050 shares, held directly.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Oxholm Jose Miguel

Role Chief Legal&Compliance Officer

Type	Security	Shares	Price	Value
Other	Common Stock	31,105	$1.66	$52K

Holdings After Transaction: Common Stock — 779,050 shares (Direct)

Footnotes (1)

1. These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer. This transaction includes the sale of issuer common shares to cover the reporting person's tax withholding obligation for vesting dates on August 25, November 13, and November 14, 2025. As a result of an administrative error by the issuer's third-party service provider, cash was paid on behalf of the reporting person for tax withholding obligations on the vesting date, August 25, 2025. A corresponding sale of issuer common shares to cover the reporting person's tax withholding obligation on August 25, 2025 could not be completed until the opening of the issuer's next window period. Accordingly, the portion of the above shares attributed to the vesting on August 25, 2025 were sold November 17, 2025, the first available date during an open window period on which the shares could be sold on behalf of the reporting person.

Form 4 Insider Transactions: What Each Field Means →

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).

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^*

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)
11/17/2025

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	11/17/2025		J(1)(2)		31,105	D	$1.66	779,050	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. These shares were sold at the direction of the issuer under the terms of the issuer's award agreement with the reporting person. Under the award agreement, the decision to sell shares to cover the reporting person's tax withholding obligations is at the sole discretion of the issuer.

2. This transaction includes the sale of issuer common shares to cover the reporting person's tax withholding obligation for vesting dates on August 25, November 13, and November 14, 2025. As a result of an administrative error by the issuer's third-party service provider, cash was paid on behalf of the reporting person for tax withholding obligations on the vesting date, August 25, 2025. A corresponding sale of issuer common shares to cover the reporting person's tax withholding obligation on August 25, 2025 could not be completed until the opening of the issuer's next window period. Accordingly, the portion of the above shares attributed to the vesting on August 25, 2025 were sold November 17, 2025, the first available date during an open window period on which the shares could be sold on behalf of the reporting person.

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 insider transaction did Hyliion (HYLN) report in this Form 4?

Hyliion reported that its Chief Legal & Compliance Officer, Jose Miguel Oxholm, sold 31,105 shares of common stock on 11/17/2025 at $1.66 per share.

Why did the Hyliion (HYLN) officer sell 31,105 shares?

The 31,105 shares were sold at the direction of the issuer under an award agreement, specifically to cover the officer’s tax withholding obligations related to vested equity awards.

Which vesting dates were involved in the Hyliion (HYLN) tax-related share sale?

The transaction includes shares sold to cover tax withholding for vesting dates on August 25, 2025, November 13, 2025, and November 14, 2025.

What was the administrative error mentioned in the Hyliion (HYLN) Form 4?

The filing states that, due to an administrative error by the issuer’s third-party service provider, cash was paid on the officer’s behalf for tax withholding on August 25, 2025, and the corresponding share sale could only occur once the next trading window opened.

When could Hyliion (HYLN) finally sell shares related to the August 25, 2025 vesting?

Shares corresponding to the August 25, 2025 vesting were sold on November 17, 2025, which was the first available date during an open trading window on which shares could be sold on behalf of the officer.

How many Hyliion (HYLN) shares does the officer hold after this transaction?

Following the reported transaction, the Chief Legal & Compliance Officer beneficially owned 779,050 shares of Hyliion common stock, held directly.

What is the reporting person’s role at Hyliion (HYLN)?

The reporting person, Jose Miguel Oxholm, serves as Hyliion’s Chief Legal & Compliance Officer and filed the Form 4 as an officer of the company.