Last 12 months
Inside the activity.
0 purchase rows · 15 sale rows
Disclosed non-derivative P/S rows, by transaction month. Includes amendments and private transactions.Monthly counts
| Month | Purchases | Sales |
|---|---|---|
| Nov 2025 | 0 | 2 |
| Dec 2025 | 0 | 2 |
| Jan 2026 | 0 | 0 |
| Feb 2026 | 0 | 0 |
| Mar 2026 | 0 | 2 |
| Apr 2026 | 0 | 0 |
| May 2026 | 0 | 4 |
| Jun 2026 | 0 | 4 |
| Jul 2026 | 0 | 0 |
| Aug 2026 | 0 | 1 |
| Sep 2026 | 0 | 0 |
| Oct 2026 | 0 | 0 |
Latest available
Insider transactions
Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”
The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.
| Transaction date | Owner / reported role | Activity / security | Shares / units | Reported price | Reported value | Details |
|---|---|---|---|---|---|---|
| May 13, 2019 Filed May 15, 2019 20:27 UTC |
Michels Patrick DDirector
|
GrantDirector Restricted Stock Units · Derivative | 5,883 | $0.00 Strike: $0.00 | $0.00 |
DisclosureSEC source: 0001567619-19-011251 · doc1.xml · derivative · entry 2 Michels Patrick D · CIK 0001775997 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 5,883 Underlying: Common Stock · 5,883 shares Expires not disclosed F1 · derivative.exercise_date: The restricted stock units will vest 100% on May 8, 2020. F1 · derivative.expiration_date: The restricted stock units will vest 100% on May 8, 2020. Read SEC document |
| May 13, 2019 Filed May 15, 2019 20:27 UTC |
Michels Patrick DDirector
|
PurchaseCommon Stock | 25,000 | $17.00 | $425,000.00 |
DisclosureSEC source: 0001567619-19-011251 · doc1.xml · nonDerivative · entry 1 Michels Patrick D · CIK 0001775997 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 25,000 Read SEC document |
| May 13, 2019 Filed May 15, 2019 20:24 UTC |
Johnson Craig EDirector
|
GrantDirector Restricted Stock Units · Derivative | 5,883 | $0.00 Strike: $0.00 | $0.00 |
DisclosureSEC source: 0001567619-19-011244 · doc1.xml · derivative · entry 1 Johnson Craig E · CIK 0001776286 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 5,883 Underlying: Common Stock · 5,883 shares Expires not disclosed F1 · derivative.exercise_date: The restricted stock units will vest 100% on May 8, 2020. F1 · derivative.expiration_date: The restricted stock units will vest 100% on May 8, 2020. Read SEC document |
| May 13, 2019 Filed May 15, 2019 20:20 UTC |
Christen Timothy LDirector
|
GrantDirector Restricted Stock Units · Derivative | 5,883 | $0.00 Strike: $0.00 | $0.00 |
DisclosureSEC source: 0001567619-19-011222 · doc1.xml · derivative · entry 2 Christen Timothy L · CIK 0001776003 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 5,883 Underlying: Common Stock · 5,883 shares Expires not disclosed F1 · derivative.exercise_date: The restricted stock units will vest 100% on May 8, 2020. F1 · derivative.expiration_date: The restricted stock units will vest 100% on May 8, 2020. Read SEC document |
| May 13, 2019 Filed May 15, 2019 20:20 UTC |
Christen Timothy LDirector
|
PurchaseCommon Stock | 5,000 | $17.00 | $85,000.00 |
DisclosureSEC source: 0001567619-19-011222 · doc1.xml · nonDerivative · entry 1 Christen Timothy L · CIK 0001776003 · Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 5,000 Read SEC document |
| May 13, 2019 Filed May 15, 2019 20:02 UTC |
Welak Eric JEVP - Fabrication
|
Disposition to issuerDeferred Compensation · Derivative | 10,986.98 | $17.00 Strike: $0.00 | $186,778.66 |
DisclosureSEC source: 0001567619-19-011161 · doc1.xml · derivative · entry 5 Welak Eric J · CIK 0001775985 · EVP - Fabrication 10b5-1 filing: Not disclosed Ownership: Indirect · by Plan Disclosed balance after: 0 Underlying: Common Stock · 10,986.98 shares Expires not disclosed F5 · derivative.exercise_price: In connection with the Issuer's initial public offering, all amounts under the Mayville Engineering Company Deferred Compensation Plan, which formerly were deemed to be invested in shares of the Issuer's common stock, were converted into and are deemed invested in alternative investment options (not the Issuer's common stock). F5 · derivative.exercise_date: In connection with the Issuer's initial public offering, all amounts under the Mayville Engineering Company Deferred Compensation Plan, which formerly were deemed to be invested in shares of the Issuer's common stock, were converted into and are deemed invested in alternative investment options (not the Issuer's common stock). F5 · derivative.expiration_date: In connection with the Issuer's initial public offering, all amounts under the Mayville Engineering Company Deferred Compensation Plan, which formerly were deemed to be invested in shares of the Issuer's common stock, were converted into and are deemed invested in alternative investment options (not the Issuer's common stock). Read SEC document |
| May 13, 2019 Filed May 15, 2019 20:02 UTC |
Welak Eric JEVP - Fabrication
|
GrantRestricted Stock Units · Derivative | 14,706 | $0.00 Strike: $0.00 | $0.00 |
DisclosureSEC source: 0001567619-19-011161 · doc1.xml · derivative · entry 4 Welak Eric J · CIK 0001775985 · EVP - Fabrication 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 14,706 Underlying: Common Stock · 14,706 shares Expires not disclosed F4 · derivative.exercise_date: The restricted stock units will vest 100% on May 8, 2020. F4 · derivative.expiration_date: The restricted stock units will vest 100% on May 8, 2020. Read SEC document |
| May 13, 2019 Filed May 15, 2019 20:02 UTC |
Welak Eric JEVP - Fabrication
|
GrantRestricted Stock Units · Derivative | 2,500 | $0.00 Strike: $0.00 | $0.00 |
DisclosureSEC source: 0001567619-19-011161 · doc1.xml · derivative · entry 3 Welak Eric J · CIK 0001775985 · EVP - Fabrication 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 2,500 Underlying: Common Stock · 2,500 shares Expires not disclosed F3 · derivative.exercise_date: The restricted stock units will vest 50% on each of May 8, 2020 and May 8, 2021. F3 · derivative.expiration_date: The restricted stock units will vest 50% on each of May 8, 2020 and May 8, 2021. Read SEC document |
| May 13, 2019 Filed May 15, 2019 20:02 UTC |
Welak Eric JEVP - Fabrication
|
GrantStock Option (right to buy) · Derivative | 0 | $0.00 Strike: $17.00 | $0.00 |
DisclosureSEC source: 0001567619-19-011161 · doc1.xml · derivative · entry 2 Welak Eric J · CIK 0001775985 · EVP - Fabrication 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 0 Underlying: Common Stock · 0 shares Expires 2029-05-08 F1 · shares: The reporting person received a stock option grant with a grant date fair value of $42,500. The actual number of shares underlying the option is being calculated and will be reported on a Form 4/A. F2 · derivative.exercise_date: The options will vest 50% on each of May 8, 2020 and May 8, 2021. F1 · derivative.underlying_shares: The reporting person received a stock option grant with a grant date fair value of $42,500. The actual number of shares underlying the option is being calculated and will be reported on a Form 4/A. F1 · balance_after: The reporting person received a stock option grant with a grant date fair value of $42,500. The actual number of shares underlying the option is being calculated and will be reported on a Form 4/A. Read SEC document |
| May 13, 2019 Filed May 15, 2019 19:56 UTC |
Butz Todd MChief Financial Officer
|
Disposition to issuerDeferred Compensation · Derivative | 65,926.16 | $0.00 | $0.00 |
DisclosureSEC source: 0001567619-19-011145 · doc1.xml · derivative · entry 5 Butz Todd M · CIK 0001775975 · Chief Financial Officer 10b5-1 filing: Not disclosed Ownership: Indirect · by Plan Disclosed balance after: 0 Underlying: Common Stock · 65,926.16 shares Expires not disclosed F5 · derivative.exercise_price: In connection with the Issuer's initial public offering, all amounts under the Mayville Engineering Company Deferred Compensation Plan, which formerly were deemed to be invested in shares of the Issuer's common stock, were converted into and are deemed invested in alternative investment options (not the Issuer's common stock). F5 · derivative.exercise_date: In connection with the Issuer's initial public offering, all amounts under the Mayville Engineering Company Deferred Compensation Plan, which formerly were deemed to be invested in shares of the Issuer's common stock, were converted into and are deemed invested in alternative investment options (not the Issuer's common stock). F5 · derivative.expiration_date: In connection with the Issuer's initial public offering, all amounts under the Mayville Engineering Company Deferred Compensation Plan, which formerly were deemed to be invested in shares of the Issuer's common stock, were converted into and are deemed invested in alternative investment options (not the Issuer's common stock). Read SEC document |
| May 13, 2019 Filed May 15, 2019 19:56 UTC |
Butz Todd MChief Financial Officer
|
GrantRestricted Stock Units · Derivative | 20,589 | $0.00 Strike: $0.00 | $0.00 |
DisclosureSEC source: 0001567619-19-011145 · doc1.xml · derivative · entry 4 Butz Todd M · CIK 0001775975 · Chief Financial Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 20,589 Underlying: Common Stock · 20,589 shares Expires not disclosed F4 · derivative.exercise_date: The restricted stock units will vest 100% on May 8, 2020. F4 · derivative.expiration_date: The restricted stock units will vest 100% on May 8, 2020. Read SEC document |
| May 13, 2019 Filed May 15, 2019 19:56 UTC |
Butz Todd MChief Financial Officer
|
GrantRestricted Stock Units · Derivative | 13,971 | $0.00 Strike: $0.00 | $0.00 |
DisclosureSEC source: 0001567619-19-011145 · doc1.xml · derivative · entry 3 Butz Todd M · CIK 0001775975 · Chief Financial Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 13,971 Underlying: Common Stock · 13,971 shares Expires not disclosed F3 · derivative.exercise_date: The restricted stock units will vest 50% on each of May 8, 2020 and May 8, 2021. F3 · derivative.expiration_date: The restricted stock units will vest 50% on each of May 8, 2020 and May 8, 2021. Read SEC document |
| May 13, 2019 Filed May 15, 2019 19:56 UTC |
Butz Todd MChief Financial Officer
|
GrantStock Option (right to buy) · Derivative | 0 | $0.00 Strike: $17.00 | $0.00 |
DisclosureSEC source: 0001567619-19-011145 · doc1.xml · derivative · entry 2 Butz Todd M · CIK 0001775975 · Chief Financial Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 0 Underlying: Common Stock · 0 shares Expires 2029-05-08 F1 · shares: The reporting person received a stock option grant with a grant date fair value of $237,500. The actual number of shares underlying the option is being calculated and will be reported on a Form 4/A. F2 · derivative.exercise_date: The options will vest 50% on each of May 8, 2020 and May 8, 2021. F1 · derivative.underlying_shares: The reporting person received a stock option grant with a grant date fair value of $237,500. The actual number of shares underlying the option is being calculated and will be reported on a Form 4/A. F1 · balance_after: The reporting person received a stock option grant with a grant date fair value of $237,500. The actual number of shares underlying the option is being calculated and will be reported on a Form 4/A. Read SEC document |
| May 13, 2019 Filed May 15, 2019 19:49 UTC |
Kamphuis Robert DDirector · Chairman, Pres. & CEO
|
Disposition to issuerDeferred Compensation · Derivative | 1,111,833.11 | $17.00 Strike: $0.00 | $18,901,162.87 |
DisclosureSEC source: 0001567619-19-011141 · doc1.xml · derivative · entry 5 Kamphuis Robert D · CIK 0001775977 · Director · Chairman, Pres. & CEO 10b5-1 filing: Not disclosed Ownership: Indirect · by Plan Disclosed balance after: 0 Underlying: Common Stock · 1,111,833.11 shares Expires not disclosed F5 · derivative.exercise_price: In connection with the Issuer's initial public offering, all amounts under the Mayville Engineering Company Deferred Compensation Plan, which formerly were deemed to be invested in shares of the Issuer's common stock, were converted into and are deemed invested in alternative investment options (not the Issuer's common stock). F5 · derivative.exercise_date: In connection with the Issuer's initial public offering, all amounts under the Mayville Engineering Company Deferred Compensation Plan, which formerly were deemed to be invested in shares of the Issuer's common stock, were converted into and are deemed invested in alternative investment options (not the Issuer's common stock). F5 · derivative.expiration_date: In connection with the Issuer's initial public offering, all amounts under the Mayville Engineering Company Deferred Compensation Plan, which formerly were deemed to be invested in shares of the Issuer's common stock, were converted into and are deemed invested in alternative investment options (not the Issuer's common stock). Read SEC document |
| May 13, 2019 Filed May 15, 2019 19:49 UTC |
Kamphuis Robert DDirector · Chairman, Pres. & CEO
|
GrantRestricted Stock Units · Derivative | 100,000 | $0.00 Strike: $0.00 | $0.00 |
DisclosureSEC source: 0001567619-19-011141 · doc1.xml · derivative · entry 4 Kamphuis Robert D · CIK 0001775977 · Director · Chairman, Pres. & CEO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 100,000 Underlying: Common Stock · 100,000 shares Expires not disclosed F4 · derivative.exercise_date: The restricted stock units will vest 100% on May 8, 2020. F4 · derivative.expiration_date: The restricted stock units will vest 100% on May 8, 2020. Read SEC document |
| May 13, 2019 Filed May 15, 2019 19:49 UTC |
Kamphuis Robert DDirector · Chairman, Pres. & CEO
|
GrantRestricted Stock Units · Derivative | 55,589 | $0.00 Strike: $0.00 | $0.00 |
DisclosureSEC source: 0001567619-19-011141 · doc1.xml · derivative · entry 3 Kamphuis Robert D · CIK 0001775977 · Director · Chairman, Pres. & CEO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 55,589 Underlying: Common Stock · 55,589 shares Expires not disclosed F3 · derivative.exercise_date: The restricted stock units will vest 50% on each of May 8, 2020 and May 8, 2021. F3 · derivative.expiration_date: The restricted stock units will vest 50% on each of May 8, 2020 and May 8, 2021. Read SEC document |
| May 13, 2019 Filed May 15, 2019 19:49 UTC |
Kamphuis Robert DDirector · Chairman, Pres. & CEO
|
GrantStock Option (right to buy) · Derivative | 0 | $0.00 Strike: $17.00 | $0.00 |
DisclosureSEC source: 0001567619-19-011141 · doc1.xml · derivative · entry 2 Kamphuis Robert D · CIK 0001775977 · Director · Chairman, Pres. & CEO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 0 Underlying: Common Stock · 0 shares Expires 2029-05-08 F1 · shares: The reporting person received a stock option grant with a grant date fair value of $945,000. The actual number of shares underlying the option is being calculated and will be reported on a Form 4/A. F2 · derivative.exercise_date: The options will vest 50% on each of May 8, 2020 and May 8, 2021. F1 · derivative.underlying_shares: The reporting person received a stock option grant with a grant date fair value of $945,000. The actual number of shares underlying the option is being calculated and will be reported on a Form 4/A. F1 · balance_after: The reporting person received a stock option grant with a grant date fair value of $945,000. The actual number of shares underlying the option is being calculated and will be reported on a Form 4/A. Read SEC document |
| May 13, 2019 Filed May 23, 2019 18:43 UTC Amendment |
Raber Ryan FEVP - Sales & Marketing
|
GrantStock Option (right to buy) · Derivative | 27,595 | $0.00 Strike: $17.00 | $0.00 |
DisclosureSEC source: 0001567619-19-011947 · doc1.xml · derivative · entry 1 Raber Ryan F · CIK 0001775978 · EVP - Sales & Marketing 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 27,595 Underlying: Common Stock · 27,595 shares Expires 2029-05-08 F1 · shares: This Form 4/A is being filed to include the number of shares underlying the option. The initial Form 4, filed on May 15, 2019, reported the grant date fair value of the option. F2 · derivative.exercise_date: The options will vest 50% on each of May 8, 2020 and May 8, 2021. F1 · derivative.underlying_shares: This Form 4/A is being filed to include the number of shares underlying the option. The initial Form 4, filed on May 15, 2019, reported the grant date fair value of the option. F1 · balance_after: This Form 4/A is being filed to include the number of shares underlying the option. The initial Form 4, filed on May 15, 2019, reported the grant date fair value of the option. Read SEC document |
| May 13, 2019 Filed May 23, 2019 14:45 UTC Amendment |
Sanderson Clifford OVice President - HR
|
GrantStock Option (right to buy) · Derivative | 14,828 | $0.00 Strike: $17.00 | $0.00 |
DisclosureSEC source: 0001567619-19-011949 · doc1.xml · derivative · entry 1 Sanderson Clifford O · CIK 0001775980 · Vice President - HR 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 14,828 Underlying: Common Stock · 14,828 shares Expires 2029-05-08 F1 · shares: This Form 4/A is being filed to include the number of shares underlying the option. The initial Form 4, filed on May 15, 2019, reported the grant date fair value of the option. F2 · derivative.exercise_date: The options will vest 50% on each of May 8, 2020 and May 8, 2021. F1 · derivative.underlying_shares: This Form 4/A is being filed to include the number of shares underlying the option. The initial Form 4, filed on May 15, 2019, reported the grant date fair value of the option. F1 · balance_after: This Form 4/A is being filed to include the number of shares underlying the option. The initial Form 4, filed on May 15, 2019, reported the grant date fair value of the option. Read SEC document |
| May 13, 2019 Filed May 23, 2019 18:41 UTC Amendment |
Butz Todd MChief Financial Officer
|
GrantStock Option (right to buy) · Derivative | 39,127 | $0.00 Strike: $17.00 | $0.00 |
DisclosureSEC source: 0001567619-19-011945 · doc1.xml · derivative · entry 1 Butz Todd M · CIK 0001775975 · Chief Financial Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 39,127 Underlying: Common Stock · 39,127 shares Expires 2029-05-08 F1 · shares: This Form 4/A is being filed to include the number of shares underlying the option. The initial Form 4, filed on May 15, 2019, reported the grant date fair value of the option. F2 · derivative.exercise_date: The options will vest 50% on each of May 8, 2020 and May 8, 2021. F1 · derivative.underlying_shares: This Form 4/A is being filed to include the number of shares underlying the option. The initial Form 4, filed on May 15, 2019, reported the grant date fair value of the option. F1 · balance_after: This Form 4/A is being filed to include the number of shares underlying the option. The initial Form 4, filed on May 15, 2019, reported the grant date fair value of the option. Read SEC document |
| May 13, 2019 Filed May 23, 2019 18:48 UTC Amendment |
Welak Eric JEVP - Fabrication
|
GrantStock Option (right to buy) · Derivative | 7,002 | $0.00 Strike: $17.00 | $0.00 |
DisclosureSEC source: 0001567619-19-011951 · doc1.xml · derivative · entry 1 Welak Eric J · CIK 0001775985 · EVP - Fabrication 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 7,002 Underlying: Common Stock · 7,002 shares Expires 2029-05-08 F1 · shares: This Form 4/A is being filed to include the number of shares underlying the option. The initial Form 4, filed on May 15, 2019, reported the grant date fair value of the option. F2 · derivative.exercise_date: The options will vest 50% on each of May 8, 2020 and May 8, 2021. F1 · derivative.underlying_shares: This Form 4/A is being filed to include the number of shares underlying the option. The initial Form 4, filed on May 15, 2019, reported the grant date fair value of the option. F1 · balance_after: This Form 4/A is being filed to include the number of shares underlying the option. The initial Form 4, filed on May 15, 2019, reported the grant date fair value of the option. Read SEC document |
| May 13, 2019 Filed May 23, 2019 18:39 UTC Amendment |
Kamphuis Robert DDirector · Chairman, Pres. & CEO
|
GrantStock Option (right to buy) · Derivative | 155,684 | $0.00 Strike: $17.00 | $0.00 |
DisclosureSEC source: 0001567619-19-011943 · doc1.xml · derivative · entry 1 Kamphuis Robert D · CIK 0001775977 · Director · Chairman, Pres. & CEO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 155,684 Underlying: Common Stock · 155,684 shares Expires 2029-05-08 F1 · shares: This Form 4/A is being filed to include the number of shares underlying the option. The initial Form 4, filed on May 15, 2019, reported the grant date fair value of the option. F2 · derivative.exercise_date: The options will vest 50% on each of May 8, 2020 and May 8, 2021. F1 · derivative.underlying_shares: This Form 4/A is being filed to include the number of shares underlying the option. The initial Form 4, filed on May 15, 2019, reported the grant date fair value of the option. F1 · balance_after: This Form 4/A is being filed to include the number of shares underlying the option. The initial Form 4, filed on May 15, 2019, reported the grant date fair value of the option. Read SEC document |
| May 13, 2019 Filed Jun 14, 2019 16:03 UTC |
Sanderson Clifford OVice President - HR
|
PurchaseCommon Stock | 150 | $17.00 | $2,550.00 |
DisclosureSEC source: 0001567619-19-013396 · doc1.xml · nonDerivative · entry 1 Sanderson Clifford O · CIK 0001775980 · Vice President - HR 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 150 Read SEC document |
Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.