| 2012-13 | OHL | Sault Ste. Marie Greyhounds | 64 | 21 | 23 | 44 | 35 | -6 | 1 | 0 | 0 | 0 | 0 | 0 |
| 2013-14 | OHL | Sault Ste. Marie Greyhounds | 64 | 27 | 35 | 62 | 51 | 9 | 9 | 2 | 5 | 7 | 4 | -1 |
| 2014-15 | OHL | Sault Ste. Marie Greyhounds | 56 | 34 | 47 | 81 | 27 | 30 | 14 | 6 | 10 | 16 | 12 | 2 |
| 2015-16 | NHL | Vancouver Canucks | 69 | 9 | 9 | 18 | 32 | -6 | -- | -- | -- | -- | -- | -- |
| 2016-17 | AHL | Springfield Thunderbirds | 42 | 11 | 14 | 25 | 55 | 5 | -- | -- | -- | -- | -- | -- |
| 2016-17 | NHL | Florida Panthers | 29 | 1 | 6 | 7 | 4 | -1 | -- | -- | -- | -- | -- | -- |
| 2017-18 | NHL | Florida Panthers | 68 | 9 | 19 | 28 | 30 | 11 | -- | -- | -- | -- | -- | -- |
| 2018-19 | NHL | Florida Panthers | 46 | 8 | 10 | 18 | 18 | -9 | -- | -- | -- | -- | -- | -- |
| 2018-19 | NHL | Pittsburgh Penguins | 32 | 11 | 6 | 17 | 13 | 8 | 3 | 0 | 1 | 1 | 0 | 1 |
| 2019-20 | NHL | Pittsburgh Penguins | 66 | 14 | 21 | 35 | 17 | 6 | 3 | 0 | 1 | 1 | 2 | -1 |
| 2020-21 | NHL | Pittsburgh Penguins | 43 | 14 | 18 | 32 | 8 | 17 | 6 | 0 | 1 | 1 | 2 | 1 |
| 2021-22 | NHL | Seattle Kraken | 74 | 27 | 23 | 50 | 33 | -26 | -- | -- | -- | -- | -- | -- |
| 2022-23 | NHL | Seattle Kraken | 79 | 40 | 30 | 70 | 14 | 18 | 8 | 1 | 2 | 3 | 6 | -1 |
| 2023-24 | NHL | Seattle Kraken | 80 | 29 | 33 | 62 | 31 | -10 | -- | -- | -- | -- | -- | -- |
| 2024-25 | NHL | Seattle Kraken | 82 | 22 | 39 | 61 | 18 | 8 | -- | -- | -- | -- | -- | -- |
| 2025-26 | NHL | Seattle Kraken | 41 | 17 | 18 | 35 | 11 | -2 | -- | -- | -- | -- | -- | -- |
| NHL TOTALS | 709 | 201 | 232 | 433 | 229 | 14 | 20 | 1 | 5 | 6 | 10 | 0 |