Mayville Engineering (MEC) director exercises 10,331 units, granted 5,959 RSUs

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

Mayville Engineering Company director Robert L. McCormick reported routine equity compensation activity. He exercised director restricted stock units covering 10,331 shares of Common Stock, resulting in direct ownership of 29,078 Common shares after the transaction.

On the same date, he received a grant of 5,959 Director Restricted Stock Units, each representing a right to receive one share of Common Stock. Footnotes state that some restricted stock units vest 100% one year from the grant date or at the earlier of one year or the next annual shareholder meeting.

Insider Trade Summary

10,331 shares exercised/converted

Mixed 3 txns

Insider McCormick Robert L

Role null

Type	Security	Shares	Price	Value
Exercise	Director Restricted Stock Units	10,331	$0.00	--
Grant/Award	Director Restricted Stock Units	5,959	$0.00	--
Exercise	Common Stock	10,331	$0.00	--

Holdings After Transaction: Director Restricted Stock Units — 0 shares (Direct, null); Common Stock — 29,078 shares (Direct, null)

Footnotes (1)

The restricted stock units vested 100% one year from the grant date. The restricted stock units will vest 100% at the earlier of one year or the next annual shareholder meeting.

Key Figures

Common shares acquired via RSU exercise: 10,331 shares Common shares held after transaction: 29,078 shares New Director RSU grant: 5,959 units +2 more

5 metrics

Common shares acquired via RSU exercise 10,331 shares Director Restricted Stock Units exercised on April 21, 2026

Common shares held after transaction 29,078 shares Direct ownership following April 21, 2026 exercise

New Director RSU grant 5,959 units Grant of Director Restricted Stock Units on April 21, 2026

Underlying shares for new RSUs 5,959 shares Each RSU represents one share of Common Stock

RSUs exercised 10,331 units Director Restricted Stock Units converted into Common Stock

Key Terms

Director Restricted Stock Units, Exercise or conversion of derivative security, Grant, award, or other acquisition, vest 100% one year from the grant date, +1 more

5 terms

Director Restricted Stock Units financial

"security_title": "Director Restricted Stock Units""

Exercise or conversion of derivative security financial

"transaction_code_description": "Exercise or conversion of derivative security""

Grant, award, or other acquisition financial

"transaction_code_description": "Grant, award, or other acquisition""

vest 100% one year from the grant date financial

"The restricted stock units vested 100% one year from the grant date."

next annual shareholder meeting financial

"vest 100% at the earlier of one year or the next annual shareholder meeting."

Form 4 Insider Transactions: What Each Field Means →

04/23/2026 - 05:02 PM

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^*

McCormick Robert L

(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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	04/21/2026		M		10,331	A	$0	29,078	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Director Restricted Stock Units	$0	04/21/2026		M			10,331	⁽¹⁾	⁽¹⁾	Common Stock	10,331	$0	0	D
Director Restricted Stock Units	$0	04/21/2026		A		5,959		⁽²⁾	⁽²⁾	Common Stock	5,959	$0	5,959	D

Explanation of Responses:

1. The restricted stock units vested 100% one year from the grant date.

2. The restricted stock units will vest 100% at the earlier of one year or the next annual shareholder meeting.

	Garrett F. Bishop, Attorney-in-Fact for Robert L. McCormick	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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider activity did Mayville Engineering (MEC) disclose for Robert L. McCormick?

Mayville Engineering reported that director Robert L. McCormick exercised director restricted stock units into 10,331 shares of Common Stock and received a new grant of 5,959 Director Restricted Stock Units on the same date, reflecting routine equity-based director compensation activity.

How many Mayville Engineering (MEC) shares does Robert L. McCormick hold after these transactions?

Following the April 21, 2026 transactions, Robert L. McCormick directly holds 29,078 shares of Mayville Engineering Common Stock and 5,959 Director Restricted Stock Units, which each represent a right to receive one share of Common Stock upon vesting according to the plan terms.

What type of securities did Robert L. McCormick exercise and receive from Mayville Engineering (MEC)?

Robert L. McCormick exercised Director Restricted Stock Units into 10,331 shares of Mayville Engineering Common Stock and received a new grant of 5,959 Director Restricted Stock Units, a form of equity compensation that typically converts into Common Stock when vesting conditions are satisfied.

How do the new Director Restricted Stock Units for Mayville Engineering (MEC) vest?

Footnotes explain that certain Mayville Engineering Director Restricted Stock Units vest 100% one year from the grant date, or 100% at the earlier of one year or the next annual shareholder meeting. Vesting must occur before they convert into Common Stock for the director.

Were there any open-market buys or sells by Robert L. McCormick in Mayville Engineering (MEC)?

The Form 4 shows no open-market purchases or sales. All transactions are coded as derivative exercises (M) or grants (A) involving Director Restricted Stock Units and related Common Stock, indicating compensation-related equity activity rather than discretionary market trading.