Hyliion insider plans Rule 144 sale of 32,000 common shares

Hyliion Holdings Corp reported a planned insider sale under Rule 144 for 32,000 common shares.

Accepted by SEC EDGAR 12/12/2025 - 03:50 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Hyliion Holdings Corp reported a planned insider sale under Rule 144 for 32,000 common shares. The shares are to be sold through UBS Financial Services Inc. on the NYSE, with an aggregate market value listed at $62,400. The filing notes 175,400,000 shares of the same class outstanding, providing context for the size of the transaction.

The seller acquired the 32,000 common shares from Hyliion Holdings Corp on 12/12/2025 as an employee benefit and paid the purchase price in cash on the same date. The approximate sale date indicated is also 12/12/2025. Over the prior three months, the same person, identified as Joshua Mook, sold 9,039 common shares on 11/17/2025 for gross proceeds of $15,000. The signer represents that they are not aware of undisclosed material adverse information about Hyliion’s operations.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Hyliion (HYLN) Form 144 filing disclose?

The filing discloses that an insider plans to sell 32,000 common shares of Hyliion Holdings Corp under Rule 144 on the NYSE through UBS Financial Services Inc.

How large is the planned Hyliion (HYLN) insider sale compared with shares outstanding?

The notice covers 32,000 common shares, while the filing states there are 175,400,000 shares of the same class outstanding.

What is the aggregate market value of the Hyliion (HYLN) shares to be sold?

The Form 144 lists an aggregate market value of $62,400 for the 32,000 common shares to be sold.

When were the Hyliion (HYLN) shares acquired by the insider?

The 32,000 common shares were acquired on 12/12/2025 as an employee benefit from Hyliion Holdings Corp, with payment made in cash on the same date.

Has this Hyliion (HYLN) insider sold shares recently before this notice?

Yes. The filing reports that 9,039 common shares were sold on 11/17/2025 for $15,000 in gross proceeds during the prior three months.

Does the Hyliion (HYLN) insider make any representation about undisclosed information?

By signing the notice, the insider represents that they do not know any material adverse information about Hyliion’s current or prospective operations that has not been publicly disclosed.

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

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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 Dr. 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	UBS Financial Services Inc 1000 Harbor Blvd 3rd Floor Weehawken NJ 07086	32000	62400	175400000	12/12/2025	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	12/12/2025	Employee Benefit	Hyliion Holdings Corp			32000	12/12/2025	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 Dr. Suite 100 Cedar Park TX 78613	common	11/17/2025	9039	15000

144: Remarks and Signature

Remarks
Date of Notice	12/12/2025
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)