[Form 4] Mayville Engineering Company, Inc. Insider Trading Activity

Mayville Engineering Company, Inc. director Jay O. Rothman reported updated equity holdings.

Rhea-AI Filing Summary

Mayville Engineering Company, Inc. director Jay O. Rothman reported updated equity holdings. He received a grant of 5,959 Director Deferred Stock Units, each tied to an equivalent number of common shares. These units are part of his director compensation and were acquired at a stated price of $0.00 per unit.

After this award, Rothman holds 71,451 Director Deferred Stock Units and 24,721 shares of common stock directly. According to the disclosure, the deferred balance includes vested restricted stock units (RSUs) that he chose to defer, which will be settled in shares when he retires or separates from the company.

Insider Trade Summary

Grant/Award: 5,959 shares

Grant/Award 2 txns

Insider Rothman Jay O.

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Director Deferred Stock Units	5,959	$0.00	$0.00
holding	Common Stock	--	--	--

Holdings After Transaction: Director Deferred Stock Units — 71,451 contracts (Direct); Common Stock — 24,721 shares (Direct)

Footnotes (1)

1. F1. The balance includes vested RSUs that were deferred by the reporting person, which will be settled upon the reporting person's retirement or separation from the company.

Key Figures

Director Deferred Stock Units granted: 5,959 units Deferred stock units after grant: 71,451 units Common shares held: 24,721 shares +1 more

4 metrics

Director Deferred Stock Units granted 5,959 units Grant of Director Deferred Stock Units on 2026-04-21

Deferred stock units after grant 71,451 units Total Director Deferred Stock Units following transaction

Common shares held 24,721 shares Common stock directly owned following transaction

Price per deferred unit $0.00 per unit Stated transaction price for Director Deferred Stock Units

Key Terms

Director Deferred Stock Units, RSUs, vested RSUs, deferred

4 terms

Director Deferred Stock Units financial

"The reporting person received 5,959 Director Deferred Stock Units"

Director deferred stock units are a form of compensation awarded to a company's board members that represents a promise of future company shares or cash tied to the value of the stock, but paid out at a later date or upon a triggering event like retirement. They align directors’ incentives with long-term performance—like giving a manager a retirement bonus held in company stock—so investors watch them for signals about governance, dilution risk, and board confidence in future growth.

RSUs financial

"The balance includes vested RSUs that were deferred by the reporting person"

RSUs, or restricted stock units, are a form of company shares given to employees as part of their compensation. They are typically awarded with certain restrictions, such as a waiting period before they can be fully owned or sold, similar to earning a gift that becomes fully yours over time. For investors, RSUs can impact a company's stock offerings and reflect how much the company relies on stock-based incentives to attract and retain talent.

vested RSUs financial

"The balance includes vested RSUs that were deferred by the reporting person"

deferred financial

"vested RSUs that were deferred by the reporting person, which will be settled"

FAQ

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

What did MEC director Jay O. Rothman report in this Form 4 filing for MEC?

Jay O. Rothman reported an updated equity position, including a grant of 5,959 Director Deferred Stock Units and his resulting holdings of common stock and deferred units with Mayville Engineering Company, Inc., reflecting routine director compensation-based equity awards.

How many Director Deferred Stock Units did MEC grant to Jay O. Rothman?

Jay O. Rothman received 5,959 Director Deferred Stock Units from Mayville Engineering Company, Inc. These units represent deferred equity compensation linked to common stock and were acquired at a stated price of $0.00 per unit according to the Form 4 disclosure.

What are Jay O. Rothman’s total Director Deferred Stock Unit holdings in MEC after this transaction?

Following the grant, Jay O. Rothman holds a total of 71,451 Director Deferred Stock Units in Mayville Engineering Company, Inc. This balance includes vested RSUs that he deferred and that will be settled in common shares at retirement or separation.

How many MEC common shares does Jay O. Rothman directly hold after the reported transactions?

After the reported transactions, Jay O. Rothman directly holds 24,721 shares of Mayville Engineering Company, Inc. common stock. This figure reflects his direct equity ownership separate from his deferred stock unit awards disclosed in the Form 4 filing.

When will Jay O. Rothman’s deferred RSUs and Director Deferred Stock Units in MEC be settled?

The filing states that the deferred balance, including vested RSUs, will be settled upon Jay O. Rothman’s retirement or separation from Mayville Engineering Company, Inc. Settlement will occur in common shares at that future employment transition event.

Does this MEC Form 4 filing show any open-market stock purchases or sales by Jay O. Rothman?

The Form 4 reflects a grant of Director Deferred Stock Units and updated holdings, but does not show open-market purchases or sales. The primary transaction is a compensation-related equity award rather than a discretionary market trade in MEC common stock.

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

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Accepted by SEC EDGAR 04/23/2026 - 05:05 PM EDT 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^*

Rothman Jay O.

(Last) (First) (Middle)

135 SOUTH 84TH STREET

SUITE 300

(Street)

MILWAUKEE WISCONSIN 53214

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Mayville Engineering Company, Inc. [ MEC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/21/2026

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								24,721	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
Director Deferred Stock Units	$0	04/21/2026		A		5,959		(1)	(1)	Common Stock	5,959	$0	71,451(1)	D

Explanation of Responses:

1. The balance includes vested RSUs that were deferred by the reporting person, which will be settled upon the reporting person's retirement or separation from the company.

	Garrett F. Bishop, Attorney-in-Fact for Jay O. Rothman	04/23/2026
	** 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)