| | G | Claimed (The Buffalo Sabres claimed G James Reimer off waivers from the Anaheim Ducks.) From |
| | LW | Activated (The Buffalo Sabres activated F Zach Benson from injured reserve.) |
| | C | Sent to minors (The Buffalo Sabres sent F Jiri Kulich to the minors.) |
| | LW | Placed on Injured Reserve (The Buffalo Sabres placed F Zach Benson on the Injured Reserve.) |
| | LW | Placed on Injured Reserve (The Buffalo Sabres placed F Zach Benson on injured reserve.) |
| | RW | Activated (The Buffalo Sabres activated F Nicolas Aube-Kubel from injured reserve.) |
| | G | Signed (The Buffalo Sabres signed G Scott Ratzlaff to a three-year, entry-level contract.) |
| | RW | Placed on Injured Reserve (The Buffalo Sabres placed F Nicolas Aube-Kubel on the Injured Reserve.) |
| | G | Waived (The Buffalo Sabres waived G James Reimer.) |
| | D | Sent to minors (The Buffalo Sabres waived D Kale Clague.) |
| | RW | Waived (The Buffalo Sabres waived F Lukas Rousek.) |
| | D | Sent to minors (The Buffalo Sabres sent D Ryan Johnson to the minors.) |
| | C | Sent to minors (The Buffalo sabres sent F Tyson Kozak to the minors.) |
| | G | Sent to minors (The Buffalo Sabres assigned G Felix Sandstrom to the minors.) |
| | C | Sent to minors (The Buffalo Sabres assigned F Josh Dunne to the minors.) |
| | LW | Sent to minors (The Buffalo Sabres assigned F Brett Murray to the minors.) |
| | D | Sent to minors (The Buffalo Sabres assigned D Jack Rathbone to the minors.) |
| | C | Sent to minors (The Buffalo Sabres assigned F Mason Jobst to the minors.) |
| | D | Sent to minors (The Buffalo Sabres assigned D Colton Poolman to the minors.) |
| | C | Sent to minors (The Buffalo Sabres sent F Anton Wahlberg to the minors.) |
| | C | Released (The Buffalo Sabres released F Riley Fiddler-Schultz.) |
| | C | Sent to minors (The Buffalo Sabres sent F Konsta Helenius to the minors.) |
| | D | Sent to minors (The Buffalo Sabres sent D Nikita Novikov to the minors.) |
| | G | Sent to minors (The Buffalo Sabres sent G Scott Ratzlaff to the minors.) |
| | RW | Sent to minors (The Buffalo Sabres sent F Tyler Tullio to the minors.) |
| | LW | Released (The Buffalo Sabres released F Brendan Warren.) |
| | D | Released (The Buffalo Sabres released D Ethan Prow.) |
| | D | Released (The Buffalo Sabres released D Zach Metsa.) |
| | LW | Released (The Buffalo Sabres released F Ty Cheveldayoff.) |
| | LW | Sent to minors (The Buffalo Sabres sent F Aleksandr Kisakov to the minors.) |
| | G | Released (The Buffalo Sabres released G Michael Houser.) |
| | RW | Sent to minors (The Buffalo Sabres sent F Isak Rosen to the minors.) |
| | LW | Sent to minors (The Buffalo Sabres sent D Viktor Neuchev to the minors.) |
| | D | Released (The Buffalo Sabres released D Noah Laaouan.) |
| | C | Sent to minors (The Buffalo Sabres sent F Noah Ostlund to the minors.) |
| | C | Released (The Buffalo Sabres released F Graham Slaggert.) |
| | RW | Sent to minors (The Buffalo Sabres sent F Olivier Nadeau to the minors.) |
| | D | Sent to minors (The Buffalo Sabres sent D Vsevolod Komarov to the minors.) |
| | D | Released (The Buffalo Sabres released D Peter Tischke.) |
| | G | Sent to minors (The Buffalo Sabres assigned G Ryerson Leenders to the minors.) |
| | LW | Sent to minors (The Buffalo Sabres assigned F Ethan Miedema to the minors.) |
| | D | Activated (The Buffalo Sabres activated D Mattias Samuelsson.) |
| | G | Contract extended (The Buffalo Sabres signed G Ukko-Pekka Luukkonen to a contract extension.) |
| | LW | Signed (The Buffalo Sabres signed F Beck Malenstyn to a two-year contract.) |
| | C | Signed (The Buffalo Sabres signed F Konsta Helenius to a three-year entry-level contract.) |
| | RW | Traded (The Edmonton Oilers traded F Tyler Tullio to the Buffalo Sabres.) From |
| | C | Traded (The Buffalo Sabres traded F Matt Savoie to the Edmonton Oilers.) To |
| | C | Traded (The Edmonton Oilers traded F Ryan McLeod to the Buffalo Sabres.) From |
| | G | Signed (The Buffalo Sabres signed G James Reimer to a one-year, two-way contract.) |
| | D | Signed (The Buffalo Sabres signed D Colton Poolman to a two-way contract.) |
| | LW | Released (The Buffalo Sabres released F Victor Olofsson.) |
| | C | Signed (The Buffalo Sabres signed F Sam Lafferty to a standard contract.) |
| | G | Signed (The Buffalo Sabres signed G Felix Sandstrom.) |
| | D | Signed (The Buffalo Sabres signed D Jacob Bryson to a standard contract.) |
| | C | Signed (The Buffalo Sabres signed F Mason Jobst.) |
| | LW | Signed (The Buffalo Sabres signed F Brett Murray.) |
| | D | Signed (The Buffalo Sabres signed D Dennis Gilbert to a standard contract.) |
| | C | Signed (The Buffalo Sabres signed F Josh Dunne.) |
| | RW | Signed (The Buffalo Sabres signed F Nicolas Aube-Kubel to a standard contract.) |
| | LW | Signed (The Buffalo Sabres signed F Jason Zucker to a standard contract.) |
| | D | Signed (The Buffalo Sabres signed D Jack Rathbone to a two-way contract.) |
| | C | Became Unrestricted Free Agent (F Zemgus Girgensons elected free agency.) |
| | C | Became Unrestricted Free Agent (F Tyson Jost elected free agency.) |
| | D | Became Unrestricted Free Agent (D Jacob Bryson elected free agency.) |
| | LW | Became Unrestricted Free Agent (F Eric Robinson elected free agency.) |
| | G | Became Unrestricted Free Agent (G Eric Comrie elected free agency.) |
| | D | Became Unrestricted Free Agent (D Joseph Cecconi elected free agency.) |
| | G | Became Unrestricted Free Agent (G Dustin Tokarski elected free agency.) |
| | D | Became Unrestricted Free Agent (D Jeremy Davies elected free agency.) |
| | LW | Contract Expired (The Buffalo Sabres bought out F Jeff Skinner's contract.) |
| | D | Drafted (The Buffalo Sabres drafted D Patrick Geary.) |
| | D | Drafted (The Buffalo Sabres drafted D Luke Osburn) |
| | LW | Traded (The Washington Capitals traded F Beck Malestyn to the Buffalo Sabres) From |
| | D | Drafted (The Buffalo Sabres drafted D Simon-Pier Brunet) |
| | D | Drafted (The Buffalo Sabres drafted D Patrick Geary.) |
| | RW | Drafted (The Buffalo Sabres drafted RW Vasily Zelenov) |
| | D | Drafted (The Buffalo Sabres drafted D Adam Kleber) |
| | RW | Drafted (The Buffalo Sabres drafted RW Brodie Ziemer) |
| | G | Drafted (The Buffalo Sabres drafted G Ryerson Leenders.) |
| | C | Drafted (The Buffalo Sabres drafted C Konsta Helenius) |
| | D | Signed (The Buffalo Sabres signed D Kale Clague to a one-year, two-way contract) |
| | RW | Sent to minors (The Buffalo Sabres sent F Lukas Rousek to the minors.) |
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