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| 2021-08-19 13:56:52 | Hartford Hebrew Hammers | | Promoted | Karl Coe | New York Warriors |
| 2021-08-19 13:54:00 | Hartford Hebrew Hammers | | Promoted | Jaymes Stewart | New York Warriors |
| 2021-08-19 12:19:00 | Baltimore Miners | Daron Gonsales | Add/Drop | Freddie Sheets | |
| 2021-08-18 23:52:18 | Cincinnati Skyliners | | Demoted | Ryan Nellis | Sao Paulo Jackalopes |
| 2021-08-18 23:45:22 | Sao Paulo Jackalopes | | Promoted | Dion Burr | Cincinnati Skyliners |
| 2021-08-18 23:45:06 | Cincinnati Skyliners | | Demoted | Deon Burke | Sao Paulo Jackalopes |
| 2021-08-18 23:42:08 | Sao Paulo Jackalopes | | Promoted | Zachary Sledge | Cincinnati Skyliners |
| 2021-08-18 23:41:54 | Sao Paulo Jackalopes | | Promoted | Ken Skelley | Cincinnati Skyliners |
| 2021-08-18 23:40:28 | Cincinnati Skyliners | | Demoted | Darius McVey | Sao Paulo Jackalopes |
| 2021-08-17 19:36:00 | Los Angeles Cacti | Patrick Edelen | Acquired via trade | Philip Cruz | Salt Lake City Night Hawks |
| 2021-08-17 19:36:00 | Los Angeles Cacti | 2nd round pick in season 31 | Acquired via trade | | Salt Lake City Night Hawks |
| 2021-08-17 19:36:00 | Los Angeles Cacti | 2nd round pick in season 31 | Acquired via trade | | Salt Lake City Night Hawks |
| 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 |