Hyliion holder plans $50K sale of 15,000 shares

Hyliion Holdings Corp. (HYLN) is the issuer for a planned resale of restricted securities under Rule 144.

Rhea-AI Filing Summary

Hyliion Holdings Corp. (HYLN) is the issuer for a planned resale of restricted securities under Rule 144. Joshua Mook intends to sell 15,000 shares of Hyliion common stock through UBS Financial Services Inc., with an approximate aggregate market value of $50,000 and total shares outstanding of 178,600,000 noted for context.

Key Figures

Planned shares to be sold: 15,000 shares of common stock Aggregate market value: $50,000 Shares outstanding: 178,600,000 shares +1 more

4 metrics

Planned shares to be sold 15,000 shares of common stock Number of Hyliion shares covered by the Rule 144 notice

Aggregate market value $50,000 Approximate market value of the 15,000 shares planned for sale

Shares outstanding 178,600,000 shares Hyliion common shares outstanding used as context in the notice

Planned sale date 08/21/2026 Approximate date of sale listed for the Rule 144 transaction

Key Terms

Rule 144, aggregate market value, Employee Benefit

3 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

aggregate market value financial

"15000 | 50000 | 178600000 | 08/21/2026 | NYSE"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

Employee Benefit financial

"Common Stock | 08/20/2026 | Employee Benefit | Hyliion Holdings Corp"

FAQ

What does this Form 144 filing mean for Hyliion Holdings Corp. (HYLN)?

It indicates that Joshua Mook has notified of an intended sale of 15,000 shares of Hyliion common stock under Rule 144. This is a resale by a security holder and does not itself represent a new issuance of shares by Hyliion.

How many Hyliion (HYLN) shares are planned to be sold under this notice?

The notice covers an intended sale of 15,000 shares of Hyliion Holdings Corp. common stock. This amount is disclosed in the securities information section associated with the Rule 144 notice.

What is the aggregate market value of the Hyliion (HYLN) shares in this Form 144?

The filing states an approximate aggregate market value of $50,000 for the 15,000 shares of Hyliion common stock that are planned to be sold under Rule 144.

How many Hyliion (HYLN) shares are outstanding according to this Form 144?

The document lists 178,600,000 shares of Hyliion Holdings Corp. common stock as outstanding. This figure provides context for the relative size of the 15,000-share planned sale.

Who is the broker for the Hyliion (HYLN) shares to be sold under Rule 144?

The planned sale of 15,000 shares of Hyliion common stock is to be executed through UBS Financial Services Inc., which is named as the broker in the securities information section.

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

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Available on EDGAR 08/21/2026 - 03:46 PM Accepted by SEC EDGAR 08/21/2026 - 03:45 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0002011297
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Hyliion Holdings Corp
SEC File Number	001-38823
Address of Issuer	1202 BMC Drive Suite 100 Cedar Park TEXAS 78613
Phone	8334954466
Name of Person for Whose Account the Securities are To Be Sold	Joshua Mook
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common Stock	UBS Financial Services Inc 1000 Harbor Blvd 3rd Floor Weehawken NJ 07086	15000	50000	178600000	08/21/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common Stock	08/20/2026	Employee Benefit	Hyliion Holdings Corp			15000	08/20/2026	cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	08/21/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/JOSEPH CASSIDY, for UBS Financial Services Inc, as attorney-in-fact for Joshua Mook
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)