| Date/Season | Transaction |
|---|
| 10/31/2023 | Washington Capitals send Matt Puempel, Jacob Bernard-Docker, Michael Pezzetta, Wyatt Johnson, Sasha Pastujov, Connor Clifton, WSH 2030 Rnd 1, WSH 2030 Rnd 2, WSH 2030 Rnd 3, WSH 2031 Rnd 2, WSH 2031 Rnd 3 to the New York Rangers for Linus Omark, Slater Koekkoek |
| 8/15/2022 | Washington Capitals send Slater Koekkoek to the New York Rangers for WPG 2028 Rnd 1 |
| 5/27/2016 | Pittsburgh Penguins send Slater Koekkoek, PIT 2022 Rnd 1, $500,000 to the Washington Capitals for Anton Lander, Gabriel Carlsson, Nicolas Petan |
| 2/18/2016 | Pittsburgh Penguins send Erik Gudbranson, PIT 2025 Rnd 2 to the Buffalo Sabres for Christian Djoos, Sasha Pokulok, Slater Koekkoek |
| 11/11/2014 | Florida Panthers send Slater Koekkoek, FLA 2020 Rnd 2, $1,000,000 to the Buffalo Sabres for Niklas Hjalmarsson |
| 2017 | Drafted in the 1st round, 11th overall by Florida |
