| 2013-14 | QMJHL | Charlottetown Islanders | 67 | 30 | 38 | 68 | 20 | -20 | 4 | 4 | 1 | 5 | 0 | -5 |
| 2014-15 | QMJHL | Charlottetown Islanders | 68 | 39 | 49 | 88 | 18 | -23 | 10 | 7 | 4 | 11 | 6 | -6 |
| 2015-16 | QMJHL | Charlottetown Islanders | 33 | 16 | 30 | 46 | 22 | -7 | 12 | 4 | 11 | 15 | 12 | -3 |
| 2015-16 | AHL | Wilkes-Barre/Scranton Penguins | -- | -- | -- | -- | -- | -- | 10 | 5 | 2 | 7 | 2 | 1 |
| 2015-16 | NHL | Pittsburgh Penguins | 18 | 2 | 0 | 2 | 0 | -1 | -- | -- | -- | -- | -- | -- |
| 2016-17 | QMJHL | Charlottetown Islanders | 31 | 32 | 27 | 59 | 8 | 29 | 12 | 9 | 11 | 20 | 17 | 3 |
| 2017-18 | AHL | Wilkes-Barre/Scranton Penguins | 65 | 32 | 33 | 65 | 28 | 4 | 3 | 1 | 0 | 1 | 0 | -4 |
| 2017-18 | NHL | Pittsburgh Penguins | 8 | 2 | 1 | 3 | 0 | 2 | -- | -- | -- | -- | -- | -- |
| 2018-19 | NHL | Pittsburgh Penguins | 16 | 0 | 4 | 4 | 0 | -7 | -- | -- | -- | -- | -- | -- |
| 2018-19 | NHL | Anaheim Ducks | 47 | 14 | 5 | 19 | 10 | -9 | -- | -- | -- | -- | -- | -- |
| 2019-20 | AHL | San Diego Gulls | 39 | 11 | 16 | 27 | 24 | -11 | -- | -- | -- | -- | -- | -- |
| 2019-20 | AHL | Hershey Bears | 5 | 1 | 5 | 6 | 2 | -1 | -- | -- | -- | -- | -- | -- |
| 2019-20 | NHL | Anaheim Ducks | 8 | 1 | 1 | 2 | 0 | -2 | -- | -- | -- | -- | -- | -- |
| 2020-21 | NHL | Washington Capitals | 42 | 13 | 7 | 20 | 12 | 7 | 3 | 0 | 1 | 1 | 4 | 0 |
| 2021-22 | NHL | Washington Capitals | 47 | 8 | 6 | 14 | 8 | 6 | -- | -- | -- | -- | -- | -- |
| 2021-22 | NHL | Seattle Kraken | 16 | 6 | 0 | 6 | 0 | -6 | -- | -- | -- | -- | -- | -- |
| 2022-23 | NHL | Seattle Kraken | 66 | 21 | 25 | 46 | 14 | 13 | 10 | 1 | 1 | 2 | 0 | -3 |
| 2023-24 | NHL | Detroit Red Wings | 76 | 18 | 25 | 43 | 22 | -5 | -- | -- | -- | -- | -- | -- |
| 2024-25 | AHL | Coachella Valley Firebirds | 19 | 11 | 14 | 25 | 6 | 0 | -- | -- | -- | -- | -- | -- |
| 2024-25 | NHL | Vancouver Canucks | 9 | 1 | 2 | 3 | 2 | -2 | -- | -- | -- | -- | -- | -- |
| 2024-25 | NHL | Seattle Kraken | 10 | 1 | 1 | 2 | 0 | 1 | -- | -- | -- | -- | -- | -- |
| 2024-25 | NHL | New Jersey Devils | 11 | 0 | 2 | 2 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | -1 |
| 2025-26 | KHL | CSKA Moskva | 29 | 12 | 19 | 31 | 6 | 4 | -- | -- | -- | -- | -- | -- |
| NHL TOTALS | 374 | 87 | 79 | 166 | 68 | -3 | 14 | 1 | 2 | 3 | 4 | -4 |