Search Results
| Date | Team | Acquired | Relinquished | Notes |
| 2008-09-29 | Celtics | • Sam Cassell | re-signed unrestricted free agent to a 1-year contract | |
| 2008-10-20 | Celtics | • Darius Miles | waived | |
| 2008-10-28 | Celtics | • Danny Ainge | promoted to president of basketball operations and re-signed to a 3-year contract extension through 2012 | |
| 2008-10-31 | Celtics | • Rajon Rondo | team exercised contract option for 2009-10 | |
| 2009-02-17 | Celtics | • 2015 second round pick (protected top 55) (not exercised) | • Sam Cassell • cash |
trade with Kings |
| 2009-02-19 | Celtics | • 2014 second round pick (from Kings) (top 55 protected in 2014, else extinguished) (?-?) | • Patrick O'Bryant | 3-team trade with Kings, Raptors |
| 2009-02-24 | Celtics | • Mikki Moore | signed free agent | |
| 2009-02-27 | Celtics | • Stephon Marbury | signed free agent | |
| 2009-06-25 | Celtics | • Lester Hudson | 2009 NBA draft second round pick (#58 overall) | |
| 2009-06-29 | Celtics | • Glen Davis | team tendered qualifying offer, making player a restricted free agent | |
| 2009-07-01 | Celtics | • Leon Powe | player became an unrestricted free agent | |
| 2009-07-01 | Celtics | • Mikki Moore | player became an unrestricted free agent | |
| 2009-07-01 | Celtics | • Eddie House | player exercised contract option for 2009-10 (P) | |
| 2009-07-02 | Celtics | • Eddie House | contract option not exercised (SN) | |
| 2009-07-08 | Celtics | • Rasheed Wallace | signed unrestricted free agent to a 3-year, $18.9M contract (third year is player option) | |
| 2009-07-31 | Celtics | • Gabe Pruitt | waived | |
| 2009-08-03 | Celtics | • Shelden Williams | signed unrestricted free agent to a 1-year, minimum contract | |
| 2009-08-09 | Celtics | • Glen Davis | re-signed restricted free agent to a 2-year, $6.3M contract | |
| 2009-09-01 | Celtics | • Marquis Daniels | signed unrestricted free agent to a 1-year, $2M contract | |
| 2009-09-28 | Celtics | • Lester Hudson | signed second round pick | |
| 2009-09-28 | Celtics | • Michael Sweetney / Mike Sweetney | signed unrestricted free agent | |
| 2009-10-22 | Celtics | • Michael Sweetney / Mike Sweetney | waived | |
| 2009-10-23 | Celtics | • Tyronn Lue | hired as director of basketball development | |
| 2009-11-02 | Celtics | • Rajon Rondo | re-signed to a 5-year, $55M contract extension | |
| 2010-01-06 | Celtics | • Lester Hudson | waived |
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