| | D | Signed (The Ottawa Senators signed D Calen Addison to a professional tryout agreement.) |
| | LW | Signed (The Ottawa Senators signed F Nikolay Kulemin to a professional tryout agreement.) |
| | C | Signed (The Ottawa Senators signed F Nick Cousins to a standard contract.) |
| | D | Signed (The Ottawa Senators signed D Carter Yakemchuk to a three-year entry-level contract.) |
| | G | Traded (The Ottawa Senators traded the draft rights of G Kevin Mandolese to the The Colorado Avalanche.) To |
| | G | Signed (The Ottawa Senators signed G Mads Sogaard.) |
| | RW | Traded (The Edmonton Oilers traded F Jake Chiasson to the Ottawa Senators.) From |
| | LW | Traded (The Ottawa Senators traded F Roby Jarventie to the Edmonton Oilers.) To |
| | C | Traded (The Edmonton Oilers traded F Xavier Bourgault to the Ottawa Senators.) From |
| | RW | Traded (The Ottawa Senators traded F Egor Sokolov to the Utah Hockey Club.) To |
| | D | Signed (The Ottawa Senators signed D Matthew Andonovski.) |
| | RW | Traded (The Utah Hockey Club traded F Jan Jenik to the Ottawa Senators.) From |
| | D | Signed (The Ottawa Senators signed D Filip Roos to a one-year, two-way contract.) |
| | C | Signed (The Ottawa Senators signed F Adam Gaudette to a standard contract.) |
| | RW | Traded (The Ottawa Senators traded F Mathieu Joseph to the St. Louis Blues.) To |
| | RW | Signed (The Ottawa Senators signed F Hayden Hodgson to a two-way contract.) |
| | D | Signed (The Washington Capitals traded D Nick Jensen to the Ottawa Senators.) From |
| | C | Signed (The Ottawa Senators signed F Garrett Pilon to a two-way contract.) |
| | D | Traded (The Ottawa Senators traded D Jakob Chychrun to the Washington Capitals.) To |
| | C | Signed (The Ottawa Senators signed F Noah Gregor to a standard contract.) |
| | RW | Signed (The Ottawa Senators Signed F Michael Amadio to a standard contract.) |
| | LW | Signed (The Ottawa Senators signed F David Perron to a 35 plus contract.) |
| | D | Signed (The Ottawa Senators signed D Jeremy Davies to a two-way contract.) |
| | LW | Became Unrestricted Free Agent (F Parker Kelly declared free agency.) |
| | LW | Contract Expired (The Ottawa Senators did not give a qualifying offer to F Boris Katchouk.) |
| | LW | Became Unrestricted Free Agent (F Dominik Kubalik elected free agency.) |
| | D | Became Unrestricted Free Agent (D Erik Brannstrom elected free agency.) |
| | D | Became Unrestricted Free Agent (D Dillon Heatherington elected free agency.) |
| | LW | Drafted (The Ottawa Senators drafted LW Javon Moore) |
| | LW | Drafted (The Ottawa Senators drafted LW Blake Montgomery) |
| | D | Drafted (The Ottawa Senators drafted D Gabriel Eliasson) |
| | C | Became Unrestricted Free Agent (F Garrett Pilon elected free agency.) |
| | LW | Became Unrestricted Free Agent (F Bokondji Imama elected free agency.) |
| | C | Drafted (The Ottawa Senators drafted LW Lucas Ellinas) |
| | D | Drafted (The Ottawa Senators drafted D Eerik Wallenius) |
| | C | Became Unrestricted Free Agent (F Rourke Chartier elected free agency.) |
| | D | Became Unrestricted Free Agent (D Jacob Larsson elected free agency.) |
| | RW | Became Unrestricted Free Agent (F Josh Currie elected free agency.) |
| | D | Drafted (The Ottawa Senators drafted D Carter Yakemchuk.) |
| | C | Contract extended (The Ottawa Senators signed F Matthew Highmore to a one-year, two-way extension.) |
| | C | Signed (The Ottawa Senators signed F Wyatt Bongiovanni to a two-way contract.) |
| | C | Traded (The Boston Bruins acquired F Mark Kastelic in a trade.) To |
| | G | Traded (The Boston Bruins acquired G Joonas Korpisalo in a trade.) To |
| | G | Traded (The Ottawa Senators acquired G Linus Ullmark in a trade.) From |
| | C | Signed (The Ottawa Senators signed F Jamieson Rees to a two-way contract.) |
| | D | Signed (The Ottawa Senators signed D Nikolas Matinpalo to a one-year, two-way contract extension.) |
| | D | Contract extended (The Ottawa Senators signed F Maxence Guenette to a contract extension.) |
| | LW | Contract extended (The Ottawa Senators signed F Cole Reinhardt to a one-year, two-way contract extension.) |
| | LW | Contract extended (The Ottawa Senators signed F Angus Crookshank to a one-year, two-way contract extension.) |
| | LW | Sent to minors (The Ottawa Senators sent F Angus Crookshank to the minors.) |
| | LW | Sent to minors (The Ottawa Senators sent F Bokondji Imama to the minors.) |
| | LW | Sent to minors (The Ottawa Senators sent F Zack Ostapchuk to the minors.) |
| | LW | Sent to minors (The Ottawa Senators sent F Jiri Smejkal to the minors.) |
| | LW | Called up from minors (The Ottawa Senators recalled F Zack Ostapchuk from the minors.) |
| | C | Sent to minors (The Ottawa Senators sent F Matthew Highmore to the minors.) |
| | C | Activated (The Ottawa Senators activated F Zack MacEwen from injured reserve.) |
| | LW | Called up from minors (The Ottawa Senators recalled F Bokondji Imama from the minors.) |
| | LW | Called up from minors (The Ottawa Senators recalled F Bokondji Imama from the minors.) |
| | C | Sent to minors (The Ottawa Senators assigned F Rourke Chartier to the minors.) |
| | LW | Called up from minors (The Ottawa Senators recalled F Jiri Smejkal from the minors.) |
| | D | Called up from minors (The Ottawa Senators recalled D Tyler Kleven from the minors.) |
| | LW | Called up from minors (The Ottawa Senators recalled F Angus Crookshank from the minors.) |
| | LW | Sent to minors (The Ottawa Senators re-assigned F Zack Ostapchuk to the minors.) |
| | C | Placed on Injured Reserve (The Ottawa Senators placed F Rourke Chartier on the Injured Reserve.) |
| | D | Sent to minors (The Ottawa Senators sent D Maxence Guénette to the minors.) |
| | LW | Sent to minors (The Ottawa Senators assigned F Jiri Smejkal to the minors.) |
| | C | Placed on Injured Reserve (The Ottawa Senators placed F Zack MacEwen on injured reserve.) |
| | C | Placed on Injured Reserve (The Ottawa Senators placed F Matthew Highmore on injured reserve, per CapFriendly.) |
| | LW | Suspension Over (The Ottawa Senators announced F Parker Kelly served his two-game suspension.) |
| | LW | Called up from minors (The Ottawa Senators recalled F Zack Ostapchuk from the minors.) |
| | LW | Suspended (The NHL suspended Ottawa Senators F Parker Kelly for two games.) |
| | LW | Claimed (The Ottawa Senators claimed F Boris Katchouk off waivers.) |
| | G | Sent to minors (The Ottawa Senators assigned G Mads Sogaard to the minors.) |
| | LW | Called up from minors (The Ottawa Senators recalled F Jiri Smejkal from the minors.) |
| | RW | Traded (The Ottawa Senators traded F Vladimir Tarasenko to the Florida Panthers.) To |
| | C | Called up from minors (The Ottawa Senators recalled F Matthew Highmore from the minors.) |
| | C | Called up from minors (The Ottawa Senators recalled F Rourke Chartier from the minors.) |
| | G | Called up from minors (The Ottawa Senators recalled G Mads Sogaard from the minors.) |
| | C | Called up from minors (The Ottawa Senators recalled F Zack MacEwen from the minors.) |
| | D | Called up from minors (The Ottawa Senators recalled D Maxence Guenette from the minors. ) |
| | G | Called up from minors (The Ottawa Senators recalled G Leevi Merilainen from the minors.) |
| | C | Placed on Injured Reserve (The Ottawa Senators placed F Josh Norris on injured reserve.) |
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