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| 2021-09-18 13:30:00 | Denver Ferris Wheels | Raul Lopez | Acquired via trade | 2nd round pick in season 33 | Dallas Hounds |
| 2021-09-18 13:30:00 | Denver Ferris Wheels | Stephen Decker | Acquired via trade | | Dallas Hounds |
| 2021-09-18 13:28:00 | San Antonio Brothas | Donn Halley | Acquired via trade | 3rd round pick in season 33 | Dallas Hounds |
| 2021-09-18 13:26:00 | Indianapolis Tornadoes | Jose Carroll | Acquired via trade | Devin Vandal | Seattle Cougars |
| 2021-09-18 13:24:00 | Indianapolis Tornadoes | Dane Vaden | Acquired via trade | Norm Worm | Dallas Hounds |
| 2021-09-18 12:47:42 | Denver Ferris Wheels | | Drop | Juan Powell | |
| 2021-09-18 12:29:40 | Denver Ferris Wheels | | Drop | Saer Sene | |
| 2021-09-18 12:14:16 | Dallas Hounds | Austin Lawson | Add/Drop | | |
| 2021-09-18 12:09:20 | Norfolk Wolves | | Promoted | Norm Worm | Dallas Hounds |
| 2021-09-18 11:24:12 | San Antonio Brothas | | Drop | Donald Bray | |
| 2021-09-17 18:40:00 | Dallas Hounds | Frank Kastner | Acquired via trade | Alfred Vail | Seattle Cougars |
| 2021-09-17 18:40:00 | Dallas Hounds | 1st round pick in season 32 | Acquired via trade | | Seattle Cougars |
| 2021-09-17 18:40:00 | Dallas Hounds | Donn Halley | Acquired via trade | | Seattle Cougars |
| 2021-09-17 18:40:00 | Dallas Hounds | Joel Morrison | Acquired via trade | | Seattle Cougars |
| 2021-09-17 18:38:00 | Indianapolis Tornadoes | Devin Vandal | Acquired via trade | Clinton Mitzel | Seattle Cougars |
| 2021-09-17 18:38:00 | Indianapolis Tornadoes | 3rd round pick in season 32 | Acquired via trade | | Seattle Cougars |
| 2021-09-17 16:33:56 | Seattle Cougars | | Demoted | Peyton Williams | Vancouver Mounties |
| 2021-09-17 16:33:28 | Seattle Cougars | Peyton Williams | Add/Drop | | |
| 2021-09-17 15:46:42 | Seattle Cougars | Kaleb Koss | Add/Drop | | |
| 2021-09-17 10:13:10 | Norfolk Wolves | | Promoted | Joel Morrison | Dallas Hounds |
| 2021-09-15 18:57:46 | San Antonio Brothas | | Drop | Garrett Park | |
| 2021-09-15 17:11:00 | New York Warriors | Lowell Nielsen | Add/Drop | | |
| 2021-09-15 15:16:10 | Seattle Cougars | | Demoted | Michael Nash | Vancouver Mounties |
| 2021-09-15 02:00:00 | San Antonio Brothas | Bailey Oakley | Acquired via trade | 2nd round pick in season 33 | Seattle Cougars |
| 2021-09-15 02:00:00 | San Antonio Brothas | 3rd round pick in season 33 | Acquired via trade | | Seattle Cougars |