| Trans Num | Date | Details |
| 2023.29 | 2023-03-10 | Maine Mariners trade Daniel Bard to the Portland Sea Dogs for Liam Hendriks and Paul Sewald. |
| 2021.9 | 2021-03-07 | Maine Mariners trade Shawn Armstrong, Josh Harrison, and MAI 2022 #5 to the Portland Sea Dogs for Pedro Baez, Daniel Bard, Elias Diaz, and Noe Ramirez. |