

| Regular Season | Playoffs | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Season | League | Team | GP | G | A | Pts | PIM | +/- | GP | G | A | Pts | PIM | +/- |
| 2010-11 | USHL | USNTDP | 36 | 1 | 9 | 10 | 28 | 6 | 2 | 0 | 0 | 0 | 2 | 1 |
| 2011-12 | USHL | USNTDP | 24 | 1 | 10 | 11 | 6 | 8 | -- | -- | -- | -- | -- | -- |
| 2015-16 | NCAA | Boston Univ. | 27 | 10 | 13 | 23 | 36 | 17 | -- | -- | -- | -- | -- | -- |
| 2016-17 | AHL | Providence Bruins | 70 | 6 | 26 | 32 | 18 | 13 | 17 | 0 | 3 | 3 | 8 | -2 |
| 2016-17 | NHL | Boston Bruins | 2 | 0 | 0 | 0 | 2 | 0 | -- | -- | -- | -- | -- | -- |
| 2017-18 | AHL | Providence Bruins | 14 | 0 | 4 | 4 | 14 | 4 | -- | -- | -- | -- | -- | -- |
| 2017-18 | NHL | Boston Bruins | 61 | 3 | 12 | 15 | 22 | 21 | 11 | 0 | 1 | 1 | 4 | -2 |
| 2018-19 | NHL | Boston Bruins | 66 | 3 | 15 | 18 | 68 | 9 | 20 | 4 | 4 | 8 | 6 | -3 |
| 2019-20 | NHL | Boston Bruins | 68 | 4 | 17 | 21 | 34 | 15 | 12 | 0 | 1 | 1 | 4 | -5 |
| 2020-21 | NHL | Boston Bruins | 37 | 5 | 15 | 20 | 22 | 11 | 11 | 1 | 3 | 4 | 4 | -2 |
| 2021-22 | NHL | Boston Bruins | 73 | 4 | 20 | 24 | 24 | 22 | 5 | 0 | 0 | 0 | 6 | -6 |
| 2022-23 | NHL | Boston Bruins | 75 | 4 | 22 | 26 | 28 | 46 | 4 | 0 | 0 | 0 | 0 | -1 |
| 2023-24 | NHL | Boston Bruins | 63 | 2 | 9 | 11 | 37 | 13 | 3 | 0 | 0 | 0 | 2 | 0 |
| 2024-25 | NHL | Pittsburgh Penguins | 82 | 1 | 39 | 40 | 16 | -6 | -- | -- | -- | -- | -- | -- |
| 2025-26 | NHL | Chicago Blackhawks | 66 | 0 | 12 | 12 | 30 | -9 | -- | -- | -- | -- | -- | -- |
| NHL TOTALS | 593 | 26 | 161 | 187 | 283 | 122 | 66 | 5 | 9 | 14 | 26 | -19 | ||
| Year | Tournament | Team | GP | G | A | Pts | PIM | +/- |
|---|---|---|---|---|---|---|---|---|
| 2014 | World Junior U-20 Championships | Team USA | 5 | 2 | 4 | 6 | 2 | 1 |