| Season | Transaction |
|---|
| 13 | Miramichi Moose send Sebastian Aho, Lassi Thomson, S14 MOO 1, S14 MON 1, S15 MOO 1, S16 MOO 2 to the Oromocto Senators for Seth Jarvis, Rodion Amirov, Cale Makar, S14 ORO 3 |
| 12 | South Esk Scotsmen send Lassi Thomson, Dylan Holloway, Hunter Jones, S15 SJK 3 to the Miramichi Moose for Shakir Mukhamadullin, Nils Hoglander, John Gibson (rental), Future Considerations |
| 11 | South Esk Scotsmen send Nils Lundkvist to the Bathurst Angry Ducks for Lassi Thomson |
| 11 | Saint John Kings send S13 BAT 1, S12 BAT 1, Lassi Thomson, Brandt Clarke, Drake Batherson to the Bathurst Angry Ducks for Noah Dobson, Jacob Trouba |
| 11 | Albert County Renegade send Lassi Thomson to the Saint John Kings for Nolan Patrick |
| 6 | Drafted in the 2nd round, 16th overall by ALB |
