Hyliion Holdings (HYLN) CAO left with 253K shares after tax sale

Rhea-AI Filing Summary

Hyliion Holdings Corp. (HYLN) reported that officer Greg Standley, Chief Accounting Officer, had an "other" disposition of 3,731 shares of common stock on 2026-08-19 at $3.73 per share. According to the award agreement, these shares were sold at the issuer’s direction solely to cover Standley’s tax withholding obligations, and his directly held stake after the transaction is 253,568 shares. The Rule 10b5-1 checkbox was not marked.

Insider Trade Summary

Net Seller: 3,731 shares

Net Sell 1 txn

Insider Standley Greg

Role Chief Accounting Officer.

Type	Security	Shares	Price	Value
Other	Common Stock F1	3,731	$3.73	$14K

Holdings After Transaction: Common Stock — 253,568 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.

Key Figures

Common stock disposed: 3,731 shares Transaction price per share: $3.73 per share Shares owned after transaction: 253,568 shares

3 metrics

Common stock disposed 3,731 shares Other disposition on 2026-08-19 under award agreement

Transaction price per share $3.73 per share Price for the 3,731-share disposition on 2026-08-19

Shares owned after transaction 253,568 shares Direct ownership by Greg Standley following the reported transaction

Key Terms

Rule 10b5-1, award agreement, tax withholding obligations

3 terms

Rule 10b5-1 regulatory

"The Rule 10b5-1 checkbox was not marked."

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

award agreement financial

"under the terms of the issuer's award agreement with the reporting person"

An award agreement is a legal contract that spells out the terms of a pay or equity grant—such as stock options, restricted shares, or cash bonuses—given to an employee, director or consultant. It describes what is being granted, any conditions for keeping it (for example, earning it over time or meeting performance targets), and what happens if the person leaves or breaks rules. Investors care because these agreements affect company costs, potential share dilution and how executives are motivated and rewarded.

tax withholding obligations financial

"to cover the reporting person's tax withholding obligations"

FAQ

What insider transaction did HYLN disclose for Greg Standley?

Hyliion disclosed that Chief Accounting Officer Greg Standley had an "other" disposition of 3,731 shares of common stock on 2026-08-19 at $3.73 per share, executed at the issuer’s direction under an award agreement to cover his tax withholding obligations.

How many HYLN shares does Greg Standley hold after this Form 4 transaction?

After the reported transaction, Chief Accounting Officer Greg Standley directly holds 253,568 shares of Hyliion Holdings Corp. common stock, as stated in the Form 4.

Was the HYLN insider transaction for Greg Standley part of a Rule 10b5-1 plan?

No. The filing’s Rule 10b5-1 checkbox is not marked, and there is no footnote stating that the 3,731-share disposition was executed under a Rule 10b5-1 trading plan.

Why were Greg Standley’s HYLN shares sold in this Form 4?

The 3,731 shares were sold at the direction of Hyliion under the terms of its award agreement with Greg Standley. The agreement allows the issuer, at its sole discretion, to sell shares to cover the reporting person’s tax withholding obligations.

What transaction code was used in Greg Standley’s HYLN Form 4?

The transaction is coded J, described as "Other acquisition or disposition." It reflects an issuer-directed sale of 3,731 shares to satisfy tax withholding, rather than an open-market buy or sell decision by Greg Standley.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/21/2026 - 04:50 PM Accepted by SEC EDGAR 08/21/2026 - 04:49 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^*

Standley Greg

(Last) (First) (Middle)

C/O HYLIION HOLDING CORP.

1202 BMC DRIVE, SUITE 100

(Street)

CEDAR PARK TEXAS 78613

(City) (State) (Zip)

UNITED STATES

(Country)

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 Accounting Officer.

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/19/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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

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	08/19/2026		J(1)		3,731	D	$3.73	253,568	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/ Greg Standley	08/21/2026
	** 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.
* Form 4: SEC 1474 (03-26)