| | C | Released (The Boston Bruins released F Oskar Steen.) |
| | D | Signed (The Boston Bruins signed D Alec Regula to a two-way contract.) |
| | LW | Signed (The Boston Bruins signed F Max Jones to a standard contract.) |
| | LW | Signed (The Boston Bruins signed F Cole Koepke to a two-way contract.) |
| | LW | Signed (The Boston Bruins signed F Jeffrey Viel.) |
| | D | Signed (The Boston Bruins signed D Billy Sweezey to a two-way contract.) |
| | LW | Signed (The Boston Bruins signed F Riley Tufte to a standard contract.) |
| | C | Signed (The Boston Bruins signed F Elias Lindholm to a standard contract.) |
| | D | Signed (The Boston Bruins signed D Nikita Zadorov to a standard contract.) |
| | D | Signed (The Boston Bruins signed D Jordan Oesterle to a two-way contract.) |
| | LW | Became Unrestricted Free Agent (F Pat Maroon elected free agency.) |
| | C | Became Unrestricted Free Agent (F Jesper Boqvist declared free agency.) |
| | LW | Became Unrestricted Free Agent (F Milan Lucic elected free agency.) |
| | LW | Became Unrestricted Free Agent (F James van Riemsdyk elected free agency.) |
| | D | Became Unrestricted Free Agent (D Derek Forbort elected free agency.) |
| | D | Became Unrestricted Free Agent (D Kevin Shattenkirk elected free agency.) |
| | D | Drafted (The Boston Bruins drafted D Elliott Groenewold) |
| | C | Traded (The Boston Bruins traded F Jakub Lauko to the Minnesota Wild) To |
| | C | Drafted (The Boston Bruins drafted C Jonathan Morello) |
| | LW | Became Unrestricted Free Agent (F Danton Heinen elected free agency.) |
| | C | Traded (The Minnesota Wild traded F Vinni Lettieri to the Boston Bruins) From |
| | C | Became Unrestricted Free Agent (F Jayson Megna elected free agency.) |
| | D | Drafted (The Boston Bruins drafted D Loke Johansson.) |
| | D | Became Unrestricted Free Agent (D Matt Grzelcyk elected free agency.) |
| | C | Became Unrestricted Free Agent (F Anthony Richard elected free agency.) |
| | LW | Became Unrestricted Free Agent (F Jake DeBrusk elected free agency.) |
| | D | Became Unrestricted Free Agent (D Dan Renouf elected free agency.) |
| | C | Drafted (The Boston Bruins drafted F Dean Letourneau.) |
| | G | Signed (The Boston Bruins signed G Brandon Bussi to a one-year, two-way contract.) |
| | C | Traded (The Boston Bruins acquired F Mark Kastelic in a trade.) From |
| | G | Traded (The Boston Bruins acquired G Joonas Korpisalo in a trade.) From |
| | G | Traded (The Ottawa Senators acquired G Linus Ullmark in a trade.) To |
| | D | Signed (The Boston Bruins signed D Ian Mitchell.) |
| | C | Called up from minors (The Boston Bruins recalled F Georgii Merkulov from the minors.) |
| | LW | Called up from minors (The Boston Bruins recalled F Joseph Abate from the minors.) |
| | G | Called up from minors (The Boston Bruins recalled G Michael DiPietro from the minors.) |
| | D | Called up from minors (The Boston Bruins recalled D Ian Mitchell from the minors.) |
| | C | Called up from minors (The Boston Bruins recalled F Oskar Steen from the minors.) |
| | C | Called up from minors (The Boston Bruins recalled F Trevor Kuntar from the minors.) |
| | D | Called up from minors (The Boston Bruins recalled D Michael Callahan from the minors.) |
| | G | Called up from minors (The Boston Bruins recalled G Brandon Bussi from the minors.) |
| | G | Sent to minors (The Boston Bruins assigned G Michael DiPietro to the minors.) |
| | C | Called up from minors (The Boston Bruins recalled F Jayson Megna from the minors.) |
| | C | Called up from minors (The Boston Bruins recalled F Patrick Brown from the minors.) |
| | C | Sent to minors (The Boston Bruins sent F Patrick Brown to the minors.) |
| | C | Called up from minors (The Boston Bruins recalled F Patrick Brown from the minors.) |
| | G | Called up from minors (The Boston Bruins recalled G Michael DiPietro from the minors.) |
| | D | Called up from minors (The Boston Bruins recalled D Mason Lohrei from the minors.) |
| | D | Called up from minors (The Boston Bruins recalled D Derek Forbort from the minors.) |
| | D | Sent to minors (The Boston Bruins sent D Mason Lohrei to the minors.) |
| | G | Called up from minors (The Boston Bruins recalled G Brandon Bussi from the minors.) |
| | C | Called up from minors (The Boston Bruins recalled F John Beecher from the minors.) |
| | D | Called up from minors (The Boston Bruins recalled D Mason Lohrei from the minors.) |
| | C | Called up from minors (The Boston Bruins recalled F Jayson Megna from the minors.) |
| | C | Sent to minors (The Boston Bruins sent F John Beecher to the minors.) |
| | C | Sent to minors (The Boston Bruins sent F Jayson Megna to the minors.) |
| | D | Sent to minors (The Boston Bruins sent D Derek Forbort to the minors.) |
| | LW | Activated (The Boston Bruins activated F Pat Maroon from injured reserve.) |
| | D | Sent to minors (The Boston Bruins assigned D Mason Lohrei to the minors.) |
| | C | Signed (The Boston Bruins signed F Riley Duran to an entry-level contract.) |
| | C | Called up from minors (The Boston Bruins recalled F John Beecher from the minors.) |
| | C | Sent to minors (The Boston Bruins assigned F John Beecher to the minors.) |
| | C | Called up from minors (The Boston Bruins recalled F John Beecher from the minors.) |
| | C | Sent to minors (The Boston Bruins assigned F John Beecher to the minors.) |
| | C | Called up from minors (The Boston Bruins recalled F Marc McLaughlin from the minors.) |
| | D | Activated (The Boston Bruins activated D Hampus Lindholm from injured reserve.) |
| | LW | Traded (The Minnesota Wild traded F Pat Maroon to the Boston Bruins.) From |
| | D | Placed on Injured Reserve (The Boston Bruins placed D Derek Forbort on long-term injured reserve.) |
| | D | Traded (The Columbus Blue Jackets traded D Andrew Peeke to the Boston Bruins.) From |
| | C | Sent to minors (The Boston Bruins assigned F Marc McLaughlin to the minors.) |
| | C | Called up from minors (The Boston Bruins recalled F Marc McLaughlin from the minors.) |
| | C | Sent to minors (The Boston Bruins assigned F Anthony Richard to the minors.) |
| | D | Sent to minors (The Boston Bruins assigned D Ian Mitchell to the minors.) |
| | RW | Called up from minors (The Boston Bruins recalled F Justin Brazeau from the minors.) |
| | D | Called up from minors (The Boston Bruins recalled D Ian Mitchell from the minors.) |
| | RW | Sent to minors (The Boston Bruins assigned F Justin Brazeau to the minors.) |
| | D | Called up from minors (The Boston Bruins recalled D Mason Lohrei from the minors.) |
| | RW | Signed (The Boston Bruins signed F Justin Brazeau to a standard contract.) |
| | C | Waived (The Boston Bruins waived F Oskar Steen.) |
| | C | Called up from minors (The Boston Bruins recalled F Anthony Richard from the minors.) |
| | C | Sent to minors (The Boston Bruins sent F Anthony Richard to the minors.) |
| | C | Called up from minors (The Boston Bruins recalled F Anthony Richard from the minors.) |
| | C | Sent to minors (The Boston Bruins assigned F Anthony Richard to the minors.) |
| | C | Called up from minors (The Boston Bruins recalled F Anthony Richard.) |
| | C | Sent to minors (The Boston Bruins assigned F Patrick Brown to the minors.) |
| | C | Called up from minors (The Boston Bruins recalled F Patrick Brown from the minors.) |
| | C | Called up from minors (The Boston Bruins recalled F Patrick Brown from the minors.) |
| | C | Sent to minors (The Boston Bruins assigned F John Beecher to the minors.) |
| | D | Activated (The Boston Bruins activated D Derek Forbort from injured reserve.) |
| | D | Sent to minors (The Boston Bruins assigned D Mason Lohrei to the minors.) |
| | D | Activated (The Boston Bruins activated D Brandon Carlo from Injured Reserve.) |
| | G | Sent to minors (The Boston Bruins assigned G Brandon Bussi to the minors.) |
| | D | Placed on Injured Reserve (The Boston Bruins placed D Brandon Carlo on Injured Reserve.) |
| | G | Called up from minors (The Boston Bruins recalled G Brandon Bussi.) |
| | D | Called up from minors (The Boston Bruins recalled D Mason Lohrei from the minors.) |
| | C | Called up from minors (The Boston Bruins recalled F Jesper Boqvist from the minors.) |
| | D | Called up from minors (The Boston Bruins recalled D Parker Wotherspoon from the minors.) |
| | D | Called up from minors (The Boston Bruins recalled D Parker Wotherspoon from the minors.) |
| | D | Called up from minors (The Boston Bruins recalled D Mason Lohrei from the minors.) |
| | C | Called up from minors (The Boston Bruins recalled F Jesper Boqvist from the minors.) |
| | C | Sent to minors (The Boston Bruins assigned F Georgii Merkulov to the minors.) |
| | D | Sent to minors (The Boston Bruins assigned D Mason Lohrei to the minors.) |
| | C | Called up from minors (The Boston Bruins recalled F Matthew Poitras from the minors.) |
| | C | Sent to minors (The Boston Bruins sent F Patrick Brown to the minors.) |
| | C | Called up from minors (The Boston Bruins recalled F Georgii Merkulov from the minors.) |
| | D | Waived (The Boston Bruins waived D Ian Mitchell.) |
| | D | Called up from minors (The Boston Bruins recalled D Mason Lohrei from the minors.) |
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