Hyliion Holdings (HYLN) CEO reports stock sale for tax withholding

Rhea-AI Filing Summary

Hyliion Holdings Corp. disclosed that Chief Executive Officer, director and 10% owner Thomas J. Healy reported a sale of 134,963 shares of common stock on 12/12/2025. The transaction price was $1.94 per share, and his directly held beneficial ownership after the sale was 35,102,148 shares.

According to the disclosure, these shares were sold at the direction of the issuer under the terms of an award agreement with the reporting person. Under that agreement, the issuer may decide to sell shares to cover the reporting person’s tax withholding obligations.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Healy Thomas J.

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Other	Common Stock	134,963	$1.94	$262K

Holdings After Transaction: Common Stock — 35,102,148 shares (Direct)

Footnotes (1)

1. F1. 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.

FAQ

What insider transaction did Hyliion Holdings Corp. (HYLN) report?

The company reported that Thomas J. Healy, its Chief Executive Officer, director and 10% owner, sold 134,963 shares of common stock in a reported transaction.

When did the Hyliion (HYLN) insider share sale take place?

The reported sale of Hyliion common stock by Thomas J. Healy occurred on 12/12/2025.

At what price were Hyliion (HYLN) shares sold in this insider transaction?

The 134,963 Hyliion common shares were reported sold at a price of $1.94 per share.

How many Hyliion (HYLN) shares does Thomas J. Healy own after this transaction?

Following the reported sale, 35,102,148 shares of Hyliion common stock were shown as beneficially owned directly by Thomas J. Healy.

Why were the Hyliion (HYLN) shares sold in this insider transaction?

The disclosure states the shares were sold at the direction of the issuer under an award agreement, which allows the issuer to sell shares to cover the reporting person’s tax withholding obligations.

What is Thomas J. Healy’s relationship to Hyliion (HYLN)?

Thomas J. Healy is listed as a Director, a 10% Owner, and an Officer with the title Chief Executive Officer of Hyliion Holdings Corp.

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Form 4 Insider Transactions: What Each Field Means →

Accepted by SEC EDGAR 12/15/2025 - 05:13 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
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^*

Healy Thomas J.

(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)

X	Director	X	10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

3. Date of Earliest Transaction (Month/Day/Year)
12/12/2025

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	12/12/2025		J(1)		134,963	D	$1.94	35,102,148	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.

Remarks:

	/s/ Thomas J. Healy	12/15/2025
	** 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.