| Date | Player | POS | Transaction |
|---|---|---|---|
| Jul 17, 2025 | D. JoshuaDakota Joshua | C | Traded for '28 4th-rd pick |
| Jul 10, 2025 | H. ThrunHenry Thrun | D | Traded for Ryan Reaves |
| Jul 1, 2025 | T. BoydTravis Boyd | C | Signed as Free Agent One-year contract |
| Jul 1, 2025 | M. KniesMatthew Knies | LW | Re-Signed Six-year contract |
| Jul 1, 2025 | P. HolmbergPontus Holmberg | RW | Became Unrestricted Free Agent Not tendered a qualifying offer |
| Jul 1, 2025 | J. HakanpaaJani Hakanpaa | D | Became Unrestricted Free Agent |
| Jul 1, 2025 | M. PezzettaMichael Pezzetta | LW | Signed as Free Agent Two-year contract |
| Jul 1, 2025 | D. MermisDakota Mermis | D | Became Unrestricted Free Agent |
| Jul 1, 2025 | D. MermisDakota Mermis | D | Signed as Free Agent Two-year contract |
| Jul 1, 2025 | S. LorentzSteven Lorentz | C | Became Unrestricted Free Agent |
| Jul 1, 2025 | S. LorentzSteven Lorentz | C | Signed as Free Agent Three-year contract |
| Jul 1, 2025 | M. KokkonenMikko Kokkonen | D | Became Unrestricted Free Agent Not tendered a qualifying offer |
| Jul 1, 2025 | V. LettieriVinni Lettieri | C | Signed as Free Agent One-year contract |
| Jul 1, 2025 | R. JohnsonReese Johnson | RW | Became Unrestricted Free Agent Not tendered a qualifying offer |
| Jul 1, 2025 | N. AbruzzeseNicholas Abruzzese | C | Became Unrestricted Free Agent |
| Jul 1, 2025 | C. PareCedric Pare | C | Became Unrestricted Free Agent Not tendered a qualifying offer |
| Jul 1, 2025 | M. MurrayMatt Murray | G | Became Unrestricted Free Agent |
| Jul 1, 2025 | A. NylanderAlex Nylander | LW | Became Unrestricted Free Agent |
| Jul 1, 2025 | N. MattinenNicolas Mattinen | D | Became Unrestricted Free Agent |
| Jul 1, 2025 | A. SteevesAlex Steeves | C | Became Unrestricted Free Agent |
| Jul 1, 2025 | B. GroulxBenoit-Olivier Groulx | C | Signed as Free Agent Two-year contract |
| Jul 1, 2025 | M. PaciorettyMax Pacioretty | LW | Became Unrestricted Free Agent |
| Jun 30, 2025 | M. MarnerMitchell Marner | RW | Contract extended Eight-year contract extension |
| Jun 30, 2025 | N. RoyNicolas Roy | C | Traded for Mitch Marner |
| Jun 30, 2025 | M. MaccelliMatias Maccelli | LW | Traded for '27 3rd-rd pick |
| Jun 27, 2025 | J. TavaresJohn Tavares | C | Contract extended Four-year contract extension |
| Jun 23, 2025 | T. NiemelaTopi Niemela | D | Signed with European team Malmo Redhawks-Sweden |
| Jun 16, 2025 | R. HirvonenRoni Hirvonen | C | Signed with European team Karpat-Finland |
| Apr 29, 2025 | A. SteevesAlex Steeves | C | Called up from minors from Toronto-AHL |
| Apr 29, 2025 | N. AbruzzeseNicholas Abruzzese | C | Called up from minors from Toronto-AHL |
| Apr 29, 2025 | A. NylanderAlex Nylander | LW | Called up from minors from Toronto-AHL |
| Apr 29, 2025 | M. MurrayMatt Murray | G | Called up from minors from Toronto-AHL |
| Apr 29, 2025 | M. KokkonenMikko Kokkonen | D | Called up from minors from Toronto-AHL |
| Apr 29, 2025 | R. JohnsonReese Johnson | RW | Called up from minors from Toronto-AHL |
| Apr 29, 2025 | W. VilleneuveWilliam Villeneuve | D | Called up from minors from Toronto-AHL |
| Apr 29, 2025 | D. HildebyDennis Hildeby | G | Called up from minors from Toronto-AHL |
| Apr 29, 2025 | T. NiemelaTopi Niemela | D | Called up from minors from Toronto-AHL |
| Apr 29, 2025 | R. HirvonenRoni Hirvonen | C | Called up from minors from Toronto-AHL |
| Apr 29, 2025 | M. BenningMatt Benning | D | Called up from minors from Toronto-AHL |
| Apr 29, 2025 | M. RifaiMarshall Rifai | D | Called up from minors from Toronto-AHL |
| Apr 29, 2025 | C. WebberCade Webber | D | Called up from minors from Toronto-AHL |
| Apr 20, 2025 | A. AkhtyamovArtur Akhtyamov | G | Called up from minors from Toronto-AHL |
| Apr 18, 2025 | R. ReavesRyan Reaves | RW | Called up from minors from Toronto-AHL |
| Apr 13, 2025 | D. MermisDakota Mermis | D | Called up from minors from Toronto-AHL |
| Mar 7, 2025 | B. CarloBrandon Carlo | D | Traded for Minten, '26 1st, '25 4th |
| Mar 7, 2025 | S. LaughtonScott Laughton | C | Traded w/ '25 4th, 6th for Grebenkin, '27 1st |
| Mar 7, 2025 | R. ReavesRyan Reaves | RW | Sent to minors Toronto-AHL |
| Mar 7, 2025 | R. JohnsonReese Johnson | RW | Traded for future considerations |
| Mar 7, 2025 | D. MermisDakota Mermis | D | Sent to minors Toronto-AHL |
| Mar 6, 2025 | R. ReavesRyan Reaves | RW | Waived |
| Mar 3, 2025 | D. MermisDakota Mermis | D | Called up from minors from Toronto-AHL |
| Mar 2, 2025 | A. SteevesAlex Steeves | C | Sent to minors Toronto-AHL |
| Mar 2, 2025 | M. RifaiMarshall Rifai | D | Sent to minors Toronto-AHL |
| Feb 28, 2025 | M. RifaiMarshall Rifai | D | Called up from minors from Toronto-AHL |
| Feb 18, 2025 | A. SteevesAlex Steeves | C | Called up from minors from Toronto-AHL |
| Feb 9, 2025 | D. MermisDakota Mermis | D | Sent to minors Toronto-AHL |
| Feb 6, 2025 | M. MurrayMatt Murray | G | Sent to minors Toronto-AHL |
| Feb 3, 2025 | D. MermisDakota Mermis | D | Called up from minors from Toronto-AHL |
| Feb 3, 2025 | F. MintenFraser Minten | C | Sent to minors Toronto-AHL |
| Feb 1, 2025 | N. GrebenkinNikita Grebenkin | RW | Sent to minors Toronto-AHL |
| Jan 31, 2025 | J. QuillanJacob Quillan | C | Sent to minors Toronto-AHL |
| Jan 25, 2025 | N. GrebenkinNikita Grebenkin | RW | Called up from minors from Toronto-AHL |
| Jan 23, 2025 | M. MurrayMatt Murray | G | Called up from minors from Toronto-AHL |
| Jan 23, 2025 | D. HildebyDennis Hildeby | G | Sent to minors Toronto-AHL |
| Jan 22, 2025 | J. QuillanJacob Quillan | C | Called up from minors from Toronto-AHL |
| Jan 21, 2025 | C. DewarConnor Dewar | C | Placed on IR Upper-body injury |
| Jan 20, 2025 | M. PaciorettyMax Pacioretty | LW | Placed on IR Upper-body injury |
Overall 52-26-4 • ATL 1st
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