FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Kamphuis Robert D
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
__X__ Officer (give title below)    _____ Other (specify below)
Chairman, Pres. & CEO
(Last)          (First)          (Middle)

715 SOUTH STREET
3. Date of Earliest Transaction (MM/DD/YYYY)

5/6/2021
(Street)

MAYVILLE, WI 53050
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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 5/6/2021  P  10000 A$16.3158 (1)311742 D  
Common Stock         80031 (2)I by ESOP and/or 401(k) Plan 

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security3. Trans. Date3A. Deemed Execution Date, if any4. Trans. Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
6. Date Exercisable and Expiration Date7. 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 of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Restricted Stock Units $0            (3) (3)Common Stock 73947  73947 D  
Restricted Stock Units $0            (4) (4)Common Stock 81371  81371 D  
Stock Option (right to buy) $14.01            (5)2/28/2031 Common Stock 164503  164503 D  
Restricted Stock Units $0            (6) (6)Common Stock 27795  27794 D  
Stock Option (right to buy) $7.12            (7)2/27/2030 Common Stock 370775  370775 D  
Stock Option (right to buy) $17            (8)5/8/2029 Common Stock 155684  155684 D  

Explanation of Responses:
(1) The price reported in Column 4 is a weighted average price. The prices actually received ranged from $15.885 to $16.75. The reporting person has provided to the issuer, and will provide to any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares purchased at each price within the range for all transactions reported in this Form 4 utilizing a weighted average price.
(2) Reflects the most recent ESOP and 401(k) balance.
(3) The restricted stock units will vest 50% on each of February 27, 2021 and February 27, 2022.
(4) The restricted stock units will vest 50% on each of February 28, 2022 and February 28, 2023.
(5) The options will vest 50% on each of February 28, 2022 and February 28, 2023.
(6) The restricted stock units will vest 50% on each of May 8, 2020 and May 8, 2021.
(7) The options will vest 50% on each of February 27, 2021 and February 27, 2022.
(8) The options will vest 50% on each of May 8, 2020 and May 8, 2021.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
Kamphuis Robert D
715 SOUTH STREET
MAYVILLE, WI 53050
X
Chairman, Pres. & CEO

Signatures
/s/ Russell E. Ryba, Attorney-in-Fact for Robert D. Kamphuis5/7/2021
**Signature of Reporting PersonDate

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