| Date/Season | Transaction |
|---|
| 5/23/2016 | Dallas Stars send Cameron Gaunce, Danick Paquette, Rick Nash, Ryan Gropp, DAL 2023 Rnd 1 to the Winnipeg Jets for Carl Klingberg, Jeff Finger, John-Michael Liles, Mattias Ritola, Ryan Stone, NAS 2024 Rnd 3 |
| 2/27/2015 | Philadelphia Flyers send Alexander Ovechkin, Ian McCoshen, Mattias Ritola, $3,000,000 to the Edmonton Oilers for Brian Lee, EDM 2019 Rnd 2, EDM 2021 Rnd 3 |
| 4/5/2013 | Toronto Maple Leafs send Bret Nasby, Casey Wellman, Mattias Ritola, Steve Bernier to the Pittsburgh Penguins for Charles-Olivier Rousse, Dan Spang, Michal Repik, Sebastian Wannstrom, $2,000,000 |
| 3/4/2013 | Toronto Maple Leafs send TOR 2017 Rnd 4 to the Colorado Avalanche for Mattias Ritola |
| 1/24/2013 | Toronto Maple Leafs send Mattias Ritola to the Colorado Avalanche for Peter Senja, Roman Petrov |
| 2008 | Drafted in the 3rd round, 87th overall by Toronto |
