| | LW | Called up from minors (The Ottawa Senators recalled F Cole Reinhardt from the minors.) |
| | C | Called up from minors (The Ottawa Senators recalled F Zack Ostapchuk from the minors.) |
| | C | Sent to minors (The Ottawa Senators sent F Zack Ostapchuk to the minors.) |
| | G | Called up from minors (The Ottawa Senators recalled G Leevi Merilainen from the minors.) |
| | LW | Sent to minors (The Ottawa Senators sent F Cole Reinhardt to the minors.) |
| | LW | Called up from minors (The Ottawa Senators recalled F Cole Reinhardt from the minors.) |
| | D | Sent to minors (The Ottawa Senators sent D Nikolas Matinpalo to the minors.) |
| | D | Called up from minors (The Ottawa Senators recalled D Nikolas Matinpalo from the minors.) |
| | LW | Sent to minors (The Ottawa Senators sent F Cole Reinhardt to the minors.) |
| | D | Sent to minors (The Ottawa Senators sent D Nikolas Matinpalo to the minors.) |
| | D | Called up from minors (The Ottawa Senators recalled D Nikolas Matinpalo from injured reserve.) |
| | D | Called up from minors (The Ottawa Senators recalled D Donovan Sebrango from the minors.) |
| | D | Placed on Injured Reserve (The Ottawa Senators placed D Artem Zub on long-term injured reserve.) |
| | LW | Called up from minors (The Ottawa Senators recalled F Cole Reinhardt from the minors.) |
| | C | Called up from minors (The Ottawa Senators recalled F Zack Ostapchuk from the minors.) |
| | C | Waived (The Ottawa Senators waived F Zack MacEwen.) |
| | LW | Activated (F David Perron is back with the Ottawa Senators after a leave of absence from the team.) |
| | C | Sent to minors (The Ottawa Senators sent F Zack Ostapchuk to the minors.) |
| | C | Called up from minors (The Ottawa Senators recalled F Zack Ostapchuk from the minors.) |
| | C | Sent to minors (The Ottawa Senators sent F Zack Ostapchuk to the minors.) |
| | C | Called up from minors (The Ottawa Senators recalled F Zack Ostapchuk from the minors.) |
| | C | Sent to minors (The Ottawa Senators sent F Zack Ostapchuk to the minors.) |
| | C | Called up from minors (The Ottawa Senators recalled F Zack Ostapchuk from the minors.) |
| | C | Called up from minors (The Ottawa Senators recalled F Zack Ostapchuk from the minors.) |
| | C | Called up from minors (The Ottawa Senators recalled F Adam Gaudette from the minors.) |
| | C | Called up from minors (The Ottawa Senators recalled F Adam Gaudette from the minors.) |
| | C | Sent to minors (The Ottawa Senators sent F Adam Gaudette to the minors.) |
| | C | Sent to minors (The Ottawa Senators sent F Zack Ostapchuk to the minors.) |
| | C | Called up from minors (The Ottawa Senators recalled F Zack Ostapchuk from the minors.) |
| | C | Called up from minors (The Ottawa Senators recalled F Adam Gaudette from the minors.) |
| | C | Sent to minors (The Ottawa Senators sent F Adam Gaudette to the minors.) |
| | LW | Sent to minors (The Ottawa Senators sent F Cole Reinhardt to the minors.) |
| | LW | Called up from minors (The Ottawa Senators recalled F Cole Reinhardt from the minors.) |
| | G | Sent to minors (The Ottawa Senators sent G Leevi Merilainen to the minors) |
| | LW | Sent to minors (The Ottawa Senators sent F Cole Reinhardt to the minors.) |
| | G | Called up from minors (The Ottawa Senators recalled G Leevi Merilainen from the minors.) |
| | LW | Not With Team (The Ottawa Senators' F David Perron is away from the team due to a personal matter.) |
| | C | Waived (The Ottawa Senators waived F Matthew Highmore.) |
| | C | Waived (The Ottawa Senators waived F Matthew Highmore.) |
| | G | Sent to minors (The Ottawa Senators sent G Mads Sogaard to 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 Adam Gaudette from the minors.) |
| | C | Sent to minors (The Ottawa Senators sent F Adam Gaudette to the minors.) |
| | G | Sent to minors (The Ottawa Senators sent G Mads Sogaard to the minors.) |
| | LW | Called up from minors (The Ottawa Senators recalled F Cole Reinhardt from the minors.) |
| | G | Called up from minors (The Ottawa Senators recalled G Mads Sogaard from the minors.) |
| | C | Sent to minors (The Ottawa Senators assigned F Lucas Ellinas to the minors.) |
| | RW | Sent to minors (The Ottawa Senators sent F Jan Jenik to the minors.) |
| | D | Sent to minors (The Ottawa Senators sent D Carter Yakemchuk to the minors.) |
| | C | Placed on Injured Reserve (The Ottawa Senators placed F Matthew Highmore on the Injured Reserve.) |
| | C | Sent to minors (The Ottawa Senators sent F Zack Ostapchuk to the minors.) |
| | D | Sent to minors (The Ottawa Senators sent D Donovan Sebrango to the minors.) |
| | G | Released (The Ottawa Senators released G Dustin Tokarski.) |
| | LW | Sent to minors (The Ottawa Senators sent F Cole Reinhardt to the minors.) |
| | C | Waived (The Ottawa Senators waived F Adam Gaudette.) |
| | RW | Waived (The Ottawa Senators sent F Jan Jenik to the minors.) |
| | D | Sent to minors (The Ottawa Senators sent D Filip Roos to the minors.) |
| | C | Sent to minors (The Ottawa Senators sent F Stephen Halliday to the minors.) |
| | D | Released (The Ottawa Senators released D Calen Addison.) |
| | RW | Sent to minors (The Ottawa Senators sent F Hayden Hodgson to the minors.) |
| | RW | Sent to minors (The Ottawa Senators sent F Tyler Boucher to the minors.) |
| | LW | Sent to minors (The Ottawa Senators sent F Angus Crookshank to the minors.) |
| | G | Sent to minors (The Ottawa Senators assigned G Mads Sogaard to the minors.) |
| | LW | Called up from minors (The Ottawa Senators recalled F Angus Crookshank from the minors.) |
| | D | Called up from minors (The Ottawa Senators recalled D Donovan Sebrango from the minors.) |
| | LW | Called up from minors (The Ottawa Senators recalled F Cole Reinhardt from the minors.) |
| | RW | Called up from minors (The Ottawa Senators recalled F Tyler Boucher from the minors.) |
| | C | Called up from minors (The Ottawa Senators recalled F Stephen Halliday from the minors.) |
| | RW | Called up from minors (The Ottawa Senators recalled F Hayden Hodgson from the minors.) |
| | D | Called up from minors (The Ottawa Senators recalled D Filip Roos from the minors.) |
| | D | Sent to minors (The Ottawa Senators sent D Filip Roos to the minors.) |
| | D | Sent to minors (The Ottawa Senators sent D Donovan Sebrango to the minors.) |
| | LW | Released (The Ottawa Senators released F Nikolay Kulemin.) |
| | G | Sent to minors (The Ottawa Senators sent G Leevi Merilainen to the minors.) |
| | RW | Sent to minors (The Ottawa Senators sent F Oskar Pettersson to the minors.) |
| | C | Sent to minors (The Ottawa Senators sent F Wyatt Bongiovanni to the minors.) |
| | D | Sent to minors (The Ottawa Senators sent D Jorian Donovan to the minors.) |
| | D | Waived (The Ottawa Senators waived D Jeremy Davies.) |
| | RW | Sent to minors (The Ottawa Senators sent F Tyler Boucher to the minors.) |
| | D | Sent to minors (The Ottawa Senators sent D Djibril Toure to the minors.) |
| | D | Waived (The Ottawa Senators waived D Maxence Guenette.) |
| | C | Sent to minors (The Ottawa Senators sent F Xavier Bourgault to the minors.) |
| | RW | Waived (The Ottawa Senators waived F Hayden Hodgson.) |
| | LW | Sent to minors (The Ottawa Senators sent F Angus Crookshank to the minors.) |
| | G | Sent to minors (The Ottawa Senators sent G Michael Simpson to the minors.) |
| | LW | Waived (The Ottawa Senators waived F Cole Reinhardt.) |
| | C | Sent to minors (The Ottawa Senators sent F Stephen Halliday to the minors.) |
| | C | Released (The Ottawa Senators released F Keean Washkurak.) |
| | D | Waived (The Ottawa Senators waived D Nikolas Matinpalo.) |
| | RW | Sent to minors (The Ottawa Senators sent F Jake Chiasson to the minors.) |
| | C | Waived (The Ottawa Senators waived F Jamieson Rees.) |
| | D | Sent to minors (The Ottawa Senators sent D Tomas Hamara to the minors.) |
| | C | Waived (The Ottawa Senators waived F Garrett Pilon.) |
| | C | Sent to minors (The Ottawa Senators sent F Philippe Daoust to the minors.) |
| | D | Sent to minors (The Ottawa Senators assigned D Gabriel Eliasson to the minors.) |
| | D | Sent to minors (The Ottawa Senators assigned D Matthew Andonovski to the minors.) |
| | D | Sent to minors (The Ottawa Senators assigned D Filip Nordberg to the minors.) |
| | 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.) |
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