Search Results
| Date | Team | Acquired | Relinquished | Notes |
| 2018-07-16 | Celtics | • Walter Lemon Jr. / Walt Lemon Jr. | signed free agent to a two way contract | |
| 2018-07-19 | Celtics | • Marcus Smart | re-signed restricted free agent to a 4-year, $52M contract | |
| 2018-07-21 | Celtics | • Abdel Nader | waived | |
| 2018-07-23 | Celtics | • Rodney Purvis | • Abdel Nader • $450K cash |
trade with Thunder |
| 2018-07-26 | Celtics | • Jabari Bird | re-signed restricted free agent to a 2-year contract | |
| 2018-07-30 | Celtics | • Rodney Purvis | waived | |
| 2018-08-21 | Celtics | • P.J. Dozier | signed unrestricted free agent to a two way contract | |
| 2018-09-04 | Celtics | • Jeff Roberson | signed free agent | |
| 2018-09-04 | Celtics | • Justin Bibbs | signed free agent | |
| 2018-09-04 | Celtics | • Nicholas King / Nick King | signed free agent | |
| 2018-09-25 | Celtics | • Jonathan Gibson | waived | |
| 2018-10-01 | Celtics | • Justin Bibbs | waived | |
| 2018-10-01 | Celtics | • Marcus Georges-Hunt | signed unrestricted free agent | |
| 2018-10-09 | Celtics | • Jeff Roberson | waived | |
| 2018-10-09 | Celtics | • Nicholas King / Nick King | waived | |
| 2018-10-13 | Celtics | • Marcus Georges-Hunt | waived | |
| 2018-10-31 | Celtics | • Guerschon Yabusele | team exercised 1-year, $3.1M contract option through 2019-20 | |
| 2018-10-31 | Celtics | • Jaylen Brown | team exercised 1-year, $6.5M contract option through 2019-20 | |
| 2018-10-31 | Celtics | • Jayson Tatum | team exercised 1-year, $7.8M contract option through 2019-20 | |
| 2018-11-29 | Celtics | • Walter Lemon Jr. / Walt Lemon Jr. | waived | |
| 2019-01-10 | Celtics | • R.J. Hunter | signed free agent to a two way contract | |
| 2019-02-07 | Celtics | • 2020 second round pick (protected top 55) (not exercised) | • Jabari Bird • cash |
trade with Hawks |
| 2019-03-24 | Celtics | • Greg Monroe | signed free agent to a 10-day contract | |
| 2019-04-03 | Celtics | • Greg Monroe | waived | |
| 2019-04-09 | Celtics | • Jonathan Gibson | signed free agent for the remainder of the season |
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