| Date/Season | Transaction |
|---|---|
| 11/16/2024 | Pittsburgh Penguins send Fabian Brunnstrom (rental) to the Toronto Maple Leafs for Roman Schmidt, Robert Hagg, Marcus Pettersson |
| 1/12/2021 | San Jose Sharks send Robert Hagg to the Toronto Maple Leafs for Zac Dalpe |
| 10/10/2018 | Nashville Predators send Drew Stafford, Jonas Holos, Marcel Goc, Robert Hagg, TB 2023 Rnd 2 to the San Jose Sharks for Niklas Hjalmarsson (rental) |
| 2019 | Drafted in the 2nd round, 49th overall by Boston (from Phoenix) |
