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| 2021-08-17 19:32:00 | St. Louis 5th Alarm | Shane Sandford | Acquired via trade | Scott Preece | Salt Lake City Night Hawks |
| 2021-08-17 19:32:00 | St. Louis 5th Alarm | 3rd round pick in season 32 | Acquired via trade | Don Kunz | Salt Lake City Night Hawks |
| 2021-08-17 19:32:00 | St. Louis 5th Alarm | 3rd round pick in season 32 | Acquired via trade | | Salt Lake City Night Hawks |
| 2021-08-17 19:28:00 | Boston Bannerman | 2nd round pick in season 31 | Acquired via trade | Lance Stone | Salt Lake City Night Hawks |
| 2021-08-17 19:28:00 | Boston Bannerman | 3rd round pick in season 31 | Acquired via trade | | Salt Lake City Night Hawks |
| 2021-08-17 19:28:00 | Boston Bannerman | 3rd round pick in season 32 | Acquired via trade | | Salt Lake City Night Hawks |
| 2021-08-17 17:26:00 | Salt Lake City Night Hawks | 1st round pick in season 32 | Acquired via trade | 1st round pick in season 31 | Las Vegas Dark Knights |
| 2021-08-15 18:38:52 | Caracas Crocodiles | | Promoted | Gus Dingess | St. Louis 5th Alarm |
| 2021-08-15 18:38:40 | St. Louis 5th Alarm | | Demoted | Jacob Bruno | Caracas Crocodiles |
| 2021-08-15 18:38:26 | Caracas Crocodiles | | Promoted | Winston Hoag | St. Louis 5th Alarm |
| 2021-08-15 18:38:10 | St. Louis 5th Alarm | | Demoted | Jared Jones | Caracas Crocodiles |
| 2021-08-15 18:37:52 | Caracas Crocodiles | | Promoted | Wayne Ford | St. Louis 5th Alarm |
| 2021-08-15 18:37:46 | Caracas Crocodiles | | Promoted | Mark Harris | St. Louis 5th Alarm |
| 2021-08-15 18:37:26 | St. Louis 5th Alarm | | Demoted | Kaleb Koss | Caracas Crocodiles |
| 2021-08-13 15:44:04 | Quebec Buzz | | Promoted | Quentin Burley | Los Angeles Cacti |
| 2021-08-07 20:06:50 | Portland Hipsters | Roberto Morse | Add/Drop | Joshua Bryant | |
| 2021-07-31 09:50:26 | Cincinnati Skyliners | | Demoted | Ken Skelley | Sao Paulo Jackalopes |
| 2021-07-31 09:47:52 | Sao Paulo Jackalopes | | Promoted | Deon Burke | Cincinnati Skyliners |
| 2021-07-30 13:23:52 | Las Vegas Dark Knights | Charles Cambridge | Add/Drop | | |
| 2021-07-30 11:45:42 | Las Vegas Dark Knights | Richard Pope | Add/Drop | | |
| 2021-07-29 00:40:42 | New York Warriors | Jacob Larkins | Add/Drop | Ronnie Klempner | |
| 2021-07-27 16:51:34 | Orlando Bombers | | Demoted | Roberto Penn | Ottawa Mt. Hawks |
| 2021-07-27 16:51:18 | Ottawa Mt. Hawks | | Promoted | Daniel Durkin | Orlando Bombers |
| 2021-07-27 16:49:14 | Orlando Bombers | | Demoted | Cody Grabowski | Ottawa Mt. Hawks |
| 2021-07-27 16:47:26 | Ottawa Mt. Hawks | | Promoted | Roberto Penn | Orlando Bombers |