Hyliion (HYLN) affiliate to sell 15,000 shares on 05/19/2026

Rhea-AI Filing Summary

Hyliion Holdings Corp filed a Form 144 notice reporting a proposed sale of 15,000 shares of Common Stock. The filing lists the intended sale date as 05/19/2026 and identifies the sale as related to an Employee Benefit transaction for cash. The filing also discloses a prior sale of 14,816 shares on 03/03/2026 by Joshua Mook.

Insights

Securities Counsel

Form 144 is a routine affiliate sale notice describing a proposed sale of 15,000 shares.

Form 144 provides notice of a proposed affiliated sale and sets the intended sale date as 05/19/2026. The filing identifies the transaction as an Employee Benefit sale for cash, which is a common mechanism for controlled‑person distributions.

Past activity includes a disclosed sale of 14,816 shares on 03/03/2026 by Joshua Mook. Cash‑flow treatment and any broker/dealer methods are not detailed in the excerpt; subsequent filings or trade reports would show execution details.

Key Figures

Proposed sale: 15,000 shares Prior sale reported: 14,816 shares Transaction type: Employee Benefit (cash)

3 metrics

Proposed sale 15,000 shares Securities To Be Sold, <date>05/19/2026</date>

Prior sale reported 14,816 shares Securities Sold During The Past 3 Months, <date>03/03/2026</date>

Transaction type Employee Benefit (cash) Listed under Securities To Be Sold

Key Terms

Form 144, Employee Benefit, Securities Sold During The Past 3 Months

3 terms

Form 144 regulatory

"Securities To Be Sold section lists proposed sale and date"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Employee Benefit financial

"Securities To Be Sold | Employee Benefit | Hyliion Holdings Corp"

Securities Sold During The Past 3 Months regulatory

"Joshua Mook ... Common Stock ... 03/03/2026 ... 14816"

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	61000	178300000	05/19/2026	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	05/19/2026	Employee Benefit	Hyliion Holdings Corp			15000	05/19/2026	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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Joshua Mook 1202 BMC Drive Suite 100 Cedar Park TX 78613	Common Stock	03/03/2026	14816	30225

144: Remarks and Signature

Remarks

Date of Notice

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does Hyliion (HYLN) report in this Form 144?

The filing notifies a proposed sale of 15,000 shares of Common Stock scheduled for 05/19/2026. It classifies the sale as an Employee Benefit transaction and notes prior insider activity disclosed in the filing.

Who is listed as having sold shares recently in the Hyliion (HYLN) filing?

The excerpt shows Joshua Mook sold 14,816 shares on 03/03/2026. This line appears under "Securities Sold During The Past 3 Months" in the provided content.

When is the proposed Hyliion (HYLN) sale scheduled to occur?

The proposed sale date reported is 05/19/2026. The filing ties the 15,000-share transaction to that date in the "Securities To Be Sold" section.

What type of transaction is the 15,000-share sale for Hyliion (HYLN)?

The filing describes the transaction as an Employee Benefit sale for cash. The excerpt does not provide further details on parties or execution methods.

Does the Form 144 indicate how proceeds will be used for Hyliion (HYLN)?

The excerpt states the sale is for cash but does not specify any use of proceeds. The filing focuses on the proposed affiliate sale; no proceeds destination is disclosed in the provided text.