| Date | Name | Symbol | Type | Security | Shares | Price | Value | Ownership | Reported |
| 02/28/2023 | Mayville Engineering Company, Inc. | MEC | Payment of Exercise | Common Stock | 9.9k | $16.06 | $158.4k | | 02/28/2023 |
| 02/28/2023 | Mayville Engineering Company, Inc. | MEC | Exercise | Restricted Stock Units | 10.7k | $0.00 | $0 | | 02/28/2023 |
| 02/28/2023 | Mayville Engineering Company, Inc. | MEC | Exercise | Restricted Stock Units | 20.1k | $0.00 | $0 | | 02/28/2023 |
| 02/28/2023 | Mayville Engineering Company, Inc. | MEC | Grant | Restricted Stock Units | 25.6k | $0.00 | $0 | | 02/28/2023 |
| 02/28/2023 | Mayville Engineering Company, Inc. | MEC | Grant | Stock Option (right to buy) | 44.7k | $16.22 | $725.4k | | 02/28/2023 |
| 02/28/2022 | Mayville Engineering Company, Inc. | MEC | Payment of Exercise | Common Stock | 7.2k | $10.32 | $74.2k | | 02/28/2022 |
| 02/28/2022 | Mayville Engineering Company, Inc. | MEC | Exercise | Restricted Stock Units | 11.8k | $0.00 | $0 | | 02/28/2022 |
| 02/28/2022 | Mayville Engineering Company, Inc. | MEC | Exercise | Restricted Stock Units | 10.7k | $0.00 | $0 | | 02/28/2022 |
| 02/28/2022 | Mayville Engineering Company, Inc. | MEC | Grant | Restricted Stock Units | 40.2k | $0.00 | $0 | | 02/28/2022 |
| 02/28/2022 | Mayville Engineering Company, Inc. | MEC | Grant | Stock Option (right to buy) | 77.4k | $10.32 | $799k | | 02/28/2022 |
| 05/08/2021 | Mayville Engineering Company, Inc. | MEC | Exercise | Restricted Stock Units | 4.9k | $0.00 | $0 | | 05/08/2021 |
| 05/08/2021 | Mayville Engineering Company, Inc. | MEC | Payment of Exercise | Common Stock | 1.6k | $17.32 | $27.3k | | 05/08/2021 |
| 02/28/2021 | Mayville Engineering Company, Inc. | MEC | Grant | Restricted Stock Units | 21.4k | $0.00 | $0 | | 02/27/2021 |
| 02/28/2021 | Mayville Engineering Company, Inc. | MEC | Grant | Stock Option (right to buy) | 43.3k | $14.01 | $606.5k | | 02/27/2021 |
| 02/27/2021 | Mayville Engineering Company, Inc. | MEC | Payment of Exercise | Common Stock | 3.8k | $14.01 | $52.6k | | 02/27/2021 |
| 02/27/2021 | Mayville Engineering Company, Inc. | MEC | Exercise | Restricted Stock Units | 11.8k | $0.00 | $0 | | 02/27/2021 |
| 05/08/2020 | Mayville Engineering Company, Inc. | MEC | Payment of Exercise | Common Stock | 8.1k | $5.02 | $40.7k | | 05/08/2020 |
| 05/08/2020 | Mayville Engineering Company, Inc. | MEC | Exercise | Restricted Stock Units | 4.9k | $0.00 | $0 | | 05/08/2020 |
| 05/08/2020 | Mayville Engineering Company, Inc. | MEC | Exercise | Restricted Stock Units | 20.6k | $0.00 | $0 | | 05/08/2020 |
| 05/08/2020 | Mayville Engineering Company, Inc. | MEC | Payment of Exercise | Common Stock | 9.7k | $5.07 | $49.1k | | 05/08/2020 |
| 05/08/2020 | Mayville Engineering Company, Inc. | MEC | Exercise | Restricted Stock Units | 4.9k | $0.00 | $0 | | 05/08/2020 |
| 05/08/2020 | Mayville Engineering Company, Inc. | MEC | Exercise | Restricted Stock Units | 20.6k | $0.00 | $0 | | 05/08/2020 |
| 02/27/2020 | Mayville Engineering Company, Inc. | MEC | Grant | Stock Option (right to buy) | 59k | $7.12 | $419.9k | | 02/27/2020 |
| 02/27/2020 | Mayville Engineering Company, Inc. | MEC | Grant | Restricted Stock Units | 23.5k | $0.00 | $0 | | 02/27/2020 |
| 10/31/2019 | Mayville Engineering Company, Inc. | MEC | Purchase | Common Stock | 2.5k | $8.50 | $21.2k | | 10/31/2019 |
| 05/13/2019 | Mayville Engineering Company, Inc. | MEC | Grant | Stock Option (right to buy) | 27.6k | $17.00 | $469.1k | | 05/13/2019 |
| 05/13/2019 | Mayville Engineering Company, Inc. | MEC | Grant | Stock Option (right to buy) | 0 | $17.00 | $0 | | 05/13/2019 |
| 05/13/2019 | Mayville Engineering Company, Inc. | MEC | Grant | Restricted Stock Units | 9.9k | $0.00 | $0 | | 05/13/2019 |
| 05/13/2019 | Mayville Engineering Company, Inc. | MEC | Grant | Restricted Stock Units | 20.6k | $0.00 | $0 | | 05/13/2019 |
| 05/13/2019 | Mayville Engineering Company, Inc. | MEC | Disposition | Deferred Compensation | 64.5k | $17.00 | $1.1M | by Plan | 05/13/2019 |