| Date/Season | Transaction |
|---|
| 12/3/2023 | Los Angeles Kings send William Karlsson, Danny DeKeyser (rental) to the Edmonton Oilers for David Musil, EDM 2030 Rnd 3, PIT 2031 Rnd 2, EDM 2031 Rnd 3 |
| 11/27/2023 | New Jersey Devils send William Karlsson (rental) to the Los Angeles Kings for CBJ 2032 Rnd 3 |
| 11/27/2023 | New Jersey Devils send Sven Baertschi (rental) to the Columbus Blue Jackets for William Karlsson, Jeremie Poirier, PHI 2030 Rnd 2 |
| 4/10/2020 | Los Angeles Kings send LA 2027 Rnd 3 to the Boston Bruins for William Karlsson |
| 2/27/2018 | Columbus Blue Jackets send Sam Steel, William Karlsson, MIN 2022 Rnd 2 to the Boston Bruins for Michael McLeod |
| 2/23/2017 | Winnipeg Jets send Cameron Gaunce, William Karlsson, WSH 2022 Rnd 3, $485,000 to the Columbus Blue Jackets for Devan Dubnyk, Roland McKeown, Tyler Graovac |
| 7/18/2016 | Toronto Maple Leafs send T.J. Brodie, William Karlsson to the Winnipeg Jets for Nick Sorensen |
| 2016 | Drafted in the 2nd round, 55th overall by Toronto (from Pittsburgh) |
