Mayville investor plans Rule 144 stock sale

Mayville Engineering Company investor Sean P. Leuba filed a Form 144 notice covering a proposed sale of 1,015 shares of Mayville Engineering Company common stock.

Accepted by SEC EDGAR 08/06/2026 - 03:22 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Mayville Engineering Company investor Sean P. Leuba filed a Form 144 notice covering a proposed sale of 1,015 shares of Mayville Engineering Company common stock. The filing states these are inherited shares from his deceased father Paul E. Leuba, with a stated aggregate market value of $25,689.65 as of 08/06/2026 on the NYSE.

The filing also reports that during the past three months, Leuba sold 11,840 shares of Mayville Engineering Company common stock for total proceeds of $301,450.01. This notice outlines potential future sales under Rule 144 and does not itself complete any transaction.

Key Figures

Proposed shares to be sold: 1,015 shares Proposed sale value: $25,689.65 CUSIP / identifier: 25500331 +4 more

7 metrics

Proposed shares to be sold 1,015 shares Mayville Engineering Company common stock covered by the Form 144 notice

Proposed sale value $25,689.65 Aggregate market value of the 1,015 inherited shares as of 08/06/2026

CUSIP / identifier 25500331 Numeric identifier listed for the common stock on the NYSE

Shares sold past 3 months 11,840 shares Mayville Engineering Company common stock sold by Sean P. Leuba

Proceeds from past 3 months’ sales $301,450.01 Total consideration for 11,840 Mayville Engineering shares sold

Proposed sale reference date 08/06/2026 Date associated with the proposed Rule 144 sale on the NYSE

Inheritance reference date 05/07/2026 Date tied to the inherited shares from deceased father Paul E. Leuba

Key Terms

Form 144, Rule 144, Securities To Be Sold, inherited shares

4 terms

Form 144 regulatory

"Sean P. Leuba filed a Form 144 notice covering a proposed sale"

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.

Rule 144 regulatory

"potential sale under Rule 144 of 1,015 inherited shares"

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.

Securities To Be Sold regulatory

"144: Securities To Be Sold Common | 05/07/2026 | Inherited Shares"

inherited shares financial

"Inherited Shares From Deceased Father | Paul E. Leuba"

FAQ

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

What stock sale is disclosed for Mayville Engineering Company (MEC) in this Form 144?

The Form 144 discloses a proposed sale of 1,015 shares of Mayville Engineering Company common stock by investor Sean P. Leuba. These shares are reported as inherited from his deceased father, Paul E. Leuba, and are listed for potential sale under Rule 144.

What is the reported value of the Mayville Engineering Company (MEC) shares proposed for sale?

The filing lists an aggregate market value of $25,689.65 for the 1,015 inherited shares of Mayville Engineering Company common stock. This value is tied to the NYSE listing as of 08/06/2026, providing a reference amount for the proposed Rule 144 sale.

What prior sales of Mayville Engineering Company (MEC) stock does Sean P. Leuba report?

Over the past three months, Sean P. Leuba reports having sold 11,840 shares of Mayville Engineering Company common stock. These sales generated total proceeds of $301,450.01, as recorded with a transaction date of 08/06/2026 in the Form 144 disclosure.

How did Sean P. Leuba acquire the Mayville Engineering Company (MEC) shares covered by this Form 144?

The Form 144 states that the 1,015 shares of Mayville Engineering Company common stock were inherited from his deceased father, Paul E. Leuba. The description field explicitly notes “Inherited Shares From Deceased Father” and references inheritance as the acquisition method.

Does this Mayville Engineering Company (MEC) Form 144 mean the shares have already been sold?

No. Form 144 is a notice of proposed sale of restricted or control securities under Rule 144. It indicates Sean P. Leuba’s intent to potentially sell 1,015 inherited shares, but the filing itself does not complete or confirm execution of those future sales.

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	0001962754
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	Mayville Engineering Company, Inc.
SEC File Number	001-38894
Address of Issuer	715 SOUTH STREET MAYVILLE WISCONSIN 53050
Phone	920-387-4500
Name of Person for Whose Account the Securities are To Be Sold	Leuba Sean P
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	Vanguard Marketing Corporation 5951 Luckett Court Suite A1 El Paso TX 79932	1015	25689.65	25500331	08/06/2026	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	05/07/2026	Inherited Shares From Deceased Father	Paul E. Leuba			1015	05/07/2026	Inheritence

* 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
Sean P Leuba 715 South Street Mayville WI 53050	Mayville Engineering Company Common Stock	08/06/2026	11840	301450.01

144: Remarks and Signature

Remarks
Date of Notice	08/06/2026
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	Sean P Leuba
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)