| | G | Contract extended (Five-year contract extension) |
| | C | Invited to Training Camp (Signed) |
| | LW | Invited to Training Camp (Signed) |
| | G | Invited to Training Camp (Signed) |
| | C | Invited to Training Camp (Signed) |
| | D | Invited to Training Camp (Signed) |
| | C | Invited to Training Camp (Signed) |
| | D | Invited to Training Camp (Signed) |
| | C | Invited to Training Camp (Signed) |
| | D | Invited to Training Camp (Signed) |
| | LW | Invited to Training Camp (Signed) |
| | D | Invited to Training Camp (Signed) |
| | C | Invited to Training Camp (Signed) |
| | D | Invited to Training Camp (Signed) |
| | RW | Invited to Training Camp (Signed) |
| | D | Invited to Training Camp (Signed) |
| | LW | Invited to Training Camp (Signed) |
| | D | Invited to Training Camp (Signed) |
| | C | Invited to Training Camp (Signed) |
| | D | Invited to Training Camp (Signed) |
| | LW | Invited to Training Camp (Signed) |
| | G | Invited to Training Camp (Signed) |
| | C | Invited to Training Camp (Signed) |
| | G | Invited to Training Camp (Signed) |
| | C | Signed (Three-year, entry-level contract) |
| | D | Signed (Three-year, entry-level contract) |
| | D | Signed (Three-year, entry-level contract) |
| | LW | Signed as Free Agent (One-year, two-way contract) |
| | D | Re-Signed (Two-year contract) |
| | D | Assigned to European Team (TPS Turku-Finland) |
| | D | Signed as Free Agent (One-year contract) |
| | LW | Signed as Free Agent (One-year, two-way contract) |
| | D | Re-Signed (Three-year contract) |
| | D | Contract extended (Six-year contract extension) |
| | LW | Contract extended (Two-year contract extension) |
| | LW | Became Unrestricted Free Agent (Signed) |
| | D | Signed as Free Agent (Two-year, two-way contract) |
| | D | Became Unrestricted Free Agent (Signed) |
| | LW | Became Unrestricted Free Agent (Signed) |
| | C | Became Unrestricted Free Agent (Signed) |
| | D | Became Unrestricted Free Agent (Signed) |
| | RW | Became Unrestricted Free Agent (Not tendered a qualifying offer) |
| | RW | Became Unrestricted Free Agent (Not tendered a qualifying offer) |
| | LW | Re-Signed (Two-year contract) |
| | LW | Re-Signed (One-year contract) |
| | C | Signed as Free Agent (Four-year contract) |
| | RW | Became Unrestricted Free Agent (Signed) |
| | C | Became Unrestricted Free Agent (Signed) |
| | D | Became Unrestricted Free Agent (Signed) |
| | C | Signed as Free Agent (One-year, two-way contract) |
| | C | Contract extended (Four-year contract extension) |
| | RW | Became Unrestricted Free Agent (Signed) |
| | RW | Traded (for Cam Atkinson) From |
| | RW | Traded (for Jakub Voracek) To |
| | D | Traded (for '21 2nd-rd pick) From |
| | D | Traded (w/ 3 picks for Seth Jones, 2 picks) From |
| | D | Traded (w/ 2 picks for Adam Boqvist, 3 picks) To |
| | D | Claimed in expansion draft (Signed) To |
| | G | Contract extended (One-year, two-way contract extension) |
| | G | Deceased (Signed) |
| | LW | Signed with European team (CSKA Moscow-KHL) |
| | C | Contract extended (One-year contract extension) |
| | C | Signed (One-year, two-way contract) |
| | D | Signed (Three-year, entry-level contract) |
| | G | Retired (Signed) |
| | RW | Sent to minors (Cleveland-AHL) |
| | G | Sent to minors (Cleveland-AHL) |
| | G | Sent to minors (Cleveland-AHL) |
| | D | Sent to minors (Cleveland-AHL) |
| | G | Called up from minors (from taxi squad) |
| | G | Designated for assignment (Taxi squad) |
| | G | Called up from minors (from taxi squad) |
| | G | Designated for assignment (Taxi squad) |
| | G | Called up from minors (from taxi squad) |
| | C | Signed as Free Agent (One-year contract) |
| | RW | Signed (Three-year, entry-level contract) |
| | G | Designated for assignment (Taxi squad) |
| | G | Called up from minors (from taxi squad) |
| | G | Designated for assignment (Taxi squad) |
| | G | Designated for assignment (Taxi squad) |
| | RW | Sent to minors (Cleveland-AHL) |
| | RW | Called up from minors (from Cleveland-AHL) |
| | G | Called up from minors (from taxi squad) |
| | C | Sent to minors (Cleveland-AHL) |
| | G | Designated for assignment (Taxi squad) |
| | G | Sent to minors (Cleveland-AHL) |
| | G | Designated for assignment (Taxi squad) |
| | G | Sent to minors (Cleveland-AHL) |
| | LW | Called up from minors (from taxi squad) |
| | G | Called up from minors (from taxi squad) |
| | D | Called up from minors (from taxi squad) |
| | RW | Designated for assignment (Taxi squad) |
| | RW | Signed (One-year, entry-level contract) |
| | C | Called up from minors (from taxi squad) |
| | D | Designated for assignment (Taxi squad) |
| | D | Called up from minors (from taxi squad) |
| | C | Designated for assignment (Taxi squad) |
| | RW | Called up from minors (from taxi squad) |
| | LW | Designated for assignment (Taxi squad) |
| | RW | Called up from minors (from taxi squad) |
| | LW | Traded (for '21 1st-rd pick, 22 4th-rd pick) To |
| | RW | Designated for assignment (Taxi squad) |
| | D | Called up from minors (from taxi squad) |
| | D | Designated for assignment (Taxi squad) |
| | D | Traded (for '21 1st, 3rd-rd picks) To |
| | RW | Called up from minors (from taxi squad) |
| | D | Designated for assignment (Taxi squad) |
| | C | Called up from minors (from taxi squad) |
| | C | Traded (for 7th round pick) To |
| | C | Designated for assignment (Taxi squad) |
| | RW | Sent to minors (Cleveland-AHL) |
| | RW | Designated for assignment (Taxi squad) |
| | LW | Called up from minors (from taxi squad) |
| | RW | Called up from minors (from taxi squad) |
| | LW | Called up from minors (from taxi squad) |
| | RW | Designated for assignment (Taxi squad) |
| | LW | Designated for assignment (Taxi squad) |
| | RW | Called up from minors (from taxi squad) |
| | C | Called up from minors (from taxi squad) |
| | RW | Designated for assignment (Taxi squad) |
| | LW | Called up from minors (from taxi squad) |
| | C | Designated for assignment (Taxi squad) |
| | G | Designated for assignment (Taxi squad) |
| | G | Called up from minors (from taxi squad) |
| | RW | Called up from minors (from taxi squad) |
| | C | Called up from minors (from taxi squad) |
| | D | Designated for assignment (Taxi squad) |
| | RW | Designated for assignment (Taxi squad) |
| | G | Designated for assignment (Taxi squad) |
| | D | Waived (Signed) |
| | C | Signed (Three-year, entry-level contract) |
| | RW | Designated for assignment (Taxi squad) |
| | LW | Designated for assignment (Taxi squad) |
| | D | Called up from minors (from taxi squad) |
| | G | Sent to minors (Cleveland-AHL) |
| | G | Called up from minors (from taxi squad) |
| | LW | Called up from minors (from taxi squad) |
| | LW | Designated for assignment (Taxi squad) |
| | LW | Called up from minors (from taxi squad) |
| | LW | Designated for assignment (Taxi squad) |
| | LW | Called up from minors (from taxi squad) |
| | LW | Designated for assignment (Taxi squad) |
| | LW | Designated for assignment (Taxi squad) |
| | LW | Called up from minors (from taxi squad) |
| | RW | Called up from minors (from taxi squad) |
| | LW | Called up from minors (from taxi squad) |
| | LW | Designated for assignment (Taxi squad) |
| | LW | Waived (Signed) |
| | C | Sent to minors (Cleveland-AHL) |
| | C | Signed as Free Agent (Two-year, entry-level contract) |
| | D | Designated for assignment (Taxi squad) |
| | G | Traded (for Mikko Lehtonen) To |
| | D | Traded (for Veini Vehvilainen) From |
| | G | Sent to minors (Cleveland-AHL) |
| | G | Sent to minors (Cleveland-AHL) |
| | G | Designated for assignment (Taxi squad) |
| | C | Sent to minors (Cleveland-AHL) |
| | RW | Sent to minors (Cleveland-AHL) |
| | G | Sent to minors (Cleveland-AHL) |
| | G | Called up from minors (from Cleveland-AHL) |
| | D | Sent to minors (Cleveland-AHL) |
