[Form 4] Hyliion Holdings Corp. Insider Trading Activity

Rhea-AI Filing Summary

Insider stock sale to cover taxes: Jose Miguel Oxholm, Chief Legal & Compliance Officer of Hyliion Holdings Corp. (HYLN), disposed of 3,357 shares of common stock at $1.60 per share as part of tax withholding tied to the vesting and distribution of restricted stock units. After this transaction he beneficially owns 797,582 shares of Hyliion stock. The filing identifies the sale as occurring in connection with satisfying a tax liability from equity vesting rather than an open-market investment decision. No derivative transactions or other securities actions were reported.

Positive

• Transparent disclosure: The Form 4 explicitly states the sale was to satisfy a tax liability related to restricted stock units.
• Modest sale size: Only 3,357 shares were sold, leaving a substantial beneficial ownership of 797,582 shares.

Negative

• None.

Insights

Securities Analyst

TL;DR: Routine insider sale to satisfy tax obligations; small relative to total holdings, limited market impact.

The sale of 3,357 shares at $1.60 to cover tax withholding is a common post-vesting action and does not alter Oxholms controlling stake meaningfully given his remaining 797,582 shares. The report shows only a non-derivative disposition tied to tax settlement and no additional compensation-related grants or option exercises disclosed. For investors, this is a routine liquidity event by an officer and not an operational signal about company performance.

Corporate Governance Expert

TL;DR: Compliance-aligned disclosure of a tax-related share sale; consistent with good governance practices.

The Form 4 disclosure clearly states the nature of the transaction as payment of taxes on vested restricted stock units, which aligns with transparency expectations for insiders. The filing lists Oxholms role as Chief Legal & Compliance Officer, reinforcing that the disposal was administrative rather than opportunistic. No patterns of repeated large disposals or use of 10b5-1 plan are indicated in this filing.

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)
09/02/2025

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	09/02/2025		F(1)		3,357	D	$1.6	797,582	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 sold for the payment of a tax liability related to the vesting and distribution of restricted stock units.

Remarks:

	/s/ Jose Miguel Oxholm	09/02/2025
	** 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 HYLN insider Jose Miguel Oxholm sell and why?

He disposed of 3,357 shares of Hyliion common stock to pay a tax liability arising from the vesting and distribution of restricted stock units.

At what price were the HYLN shares sold by the insider?

The shares were sold at $1.60 per share according to the reported transaction.

How many HYLN shares does the reporting insider own after the transaction?

The filing shows the reporting person beneficially owns 797,582 shares after the reported disposition.

Was the Form 4 sale part of a 10b5-1 trading plan for HYLN?

The filing does not indicate the transaction was made pursuant to a 10b5-1 plan; it is described as a tax-withholding sale tied to RSU vesting.

Does the Form 4 report any derivative transactions for HYLN by the insider?

No derivative securities (options, warrants, or convertible instruments) were reported in this Form 4.