| Date | Name | Symbol | Type | Security | Shares | Price | Value | Ownership | Reported |
| 02/28/2023 | Mayville Engineering Company, Inc. | MEC | Grant | Stock Option (right to buy) | 40.4k | $16.22 | $655.5k | | 02/28/2023 |
| 02/28/2023 | Mayville Engineering Company, Inc. | MEC | Grant | Restricted Stock Units | 23.1k | $0.00 | $0 | | 02/28/2023 |
| 02/28/2023 | Mayville Engineering Company, Inc. | MEC | Exercise | Restricted Stock Units | 18.2k | $0.00 | $0 | | 02/28/2023 |
| 02/28/2023 | Mayville Engineering Company, Inc. | MEC | Exercise | Restricted Stock Units | 9.8k | $0.00 | $0 | | 02/28/2023 |
| 02/28/2023 | Mayville Engineering Company, Inc. | MEC | Payment of Exercise | Common Stock | 9k | $16.06 | $143.8k | | 02/28/2023 |
| 08/10/2022 | Mayville Engineering Company, Inc. | MEC | Purchase | Common Stock | 2k | $7.25 | $14.5k | | 08/10/2022 |
| 02/28/2022 | Mayville Engineering Company, Inc. | MEC | Grant | Restricted Stock Units | 36.3k | $0.00 | $0 | | 02/28/2022 |
| 02/28/2022 | Mayville Engineering Company, Inc. | MEC | Grant | Stock Option (right to buy) | 70k | $10.32 | $722k | | 02/28/2022 |
| 02/28/2022 | Mayville Engineering Company, Inc. | MEC | Exercise | Restricted Stock Units | 9.8k | $0.00 | $0 | | 02/28/2022 |
| 02/28/2022 | Mayville Engineering Company, Inc. | MEC | Payment of Exercise | Common Stock | 8.8k | $10.32 | $90.4k | | 02/28/2022 |
| 02/28/2022 | Mayville Engineering Company, Inc. | MEC | Exercise | Restricted Stock Units | 17.6k | $0.00 | $0 | | 02/28/2022 |
| 05/08/2021 | Mayville Engineering Company, Inc. | MEC | Exercise | Restricted Stock Units | 7k | $0.00 | $0 | | 05/08/2021 |
| 05/08/2021 | Mayville Engineering Company, Inc. | MEC | Payment of Exercise | Common Stock | 2.2k | $17.32 | $38.7k | | 05/08/2021 |
| 02/28/2021 | Mayville Engineering Company, Inc. | MEC | Grant | Restricted Stock Units | 19.6k | $0.00 | $0 | | 02/27/2021 |
| 02/28/2021 | Mayville Engineering Company, Inc. | MEC | Grant | Stock Option (right to buy) | 39.7k | $14.01 | $556k | | 02/27/2021 |
| 02/27/2021 | Mayville Engineering Company, Inc. | MEC | Payment of Exercise | Common Stock | 5.6k | $14.01 | $78.7k | | 02/27/2021 |
| 02/27/2021 | Mayville Engineering Company, Inc. | MEC | Exercise | Restricted Stock Units | 17.6k | $0.00 | $0 | | 02/27/2021 |
| 05/08/2020 | Mayville Engineering Company, Inc. | MEC | Exercise | Restricted Stock Units | 7k | $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 |
| 03/12/2020 | Mayville Engineering Company, Inc. | MEC | Purchase | Common Stock | 5k | $4.23 | $21.1k | | 03/12/2020 |
| 02/27/2020 | Mayville Engineering Company, Inc. | MEC | Grant | Restricted Stock Units | 35.1k | $0.00 | $0 | | 02/27/2020 |
| 02/27/2020 | Mayville Engineering Company, Inc. | MEC | Grant | Stock Option (right to buy) | 88k | $7.12 | $626.8k | | 02/27/2020 |
| 10/30/2019 | Mayville Engineering Company, Inc. | MEC | Purchase | Common Stock | 10k | $8.75 | $87.5k | | 10/30/2019 |
| 06/12/2019 | Mayville Engineering Company, Inc. | MEC | Purchase | Common Stock | 600 | $12.59 | $7.6k | | 06/12/2019 |
| 06/12/2019 | Mayville Engineering Company, Inc. | MEC | Purchase | Common Stock | 453 | $12.95 | $5.9k | | 06/12/2019 |
| 06/12/2019 | Mayville Engineering Company, Inc. | MEC | Purchase | Common Stock | 4.4k | $13.19 | $58.3k | | 06/12/2019 |
| 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 | Stock Option (right to buy) | 39.1k | $17.00 | $665.2k | | 05/13/2019 |
| 05/13/2019 | Mayville Engineering Company, Inc. | MEC | Grant | Restricted Stock Units | 14k | $0.00 | $0 | | 05/13/2019 |
| 05/13/2019 | Mayville Engineering Company, Inc. | MEC | Disposition | Deferred Compensation | 65.9k | $0.00 | $0 | by Plan | 05/13/2019 |
| 05/13/2019 | Mayville Engineering Company, Inc. | MEC | Grant | Restricted Stock Units | 20.6k | $0.00 | $0 | | 05/13/2019 |