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| 2021-02-21 12:04:38 | Houston Octopods | | Demoted | Nathan Abrego | Syracuse River Rats |
| 2021-02-20 12:39:26 | Hartford Hebrew Hammers | | Promoted | Donald Cornwall | New York Warriors |
| 2021-02-20 12:39:12 | New York Warriors | | Demoted | Jack Merritt | Hartford Hebrew Hammers |
| 2021-02-19 15:36:00 | Cincinnati Skyliners | Rubin Elwood | Acquired via trade | Bourbon Mayor | Seattle Cougars |
| 2021-02-19 15:36:00 | Cincinnati Skyliners | 2nd round pick in season 31 | Acquired via trade | | Seattle Cougars |
| 2021-02-19 15:36:00 | Cincinnati Skyliners | 3rd round pick in season 30 | Acquired via trade | | Seattle Cougars |
| 2021-02-19 14:23:34 | Louisville Colonels | Cesar Lombardo | Add/Drop | | |
| 2021-02-19 13:55:42 | Seattle Cougars | | Drop | Leandro Burchfield | |
| 2021-02-17 15:47:42 | New Orleans Hurricanes | James Williams | Add/Drop | | |
| 2021-02-17 13:51:40 | San Francisco Golden Gators | Bill Davis | Add/Drop | | |
| 2021-02-17 13:45:26 | San Francisco Golden Gators | | Demoted | Douglas Elder | Little Rock Fighting Farmers |
| 2021-02-17 07:16:48 | Sacramento Rainbow Trout | | Drop | Nathella Brash | |
| 2021-02-15 19:13:00 | Portland Hipsters | Dale Fisher | Add/Drop | Franklin Grammer | |
| 2021-02-15 06:23:32 | San Diego Sabercats | | Drop | Kenneth Curry | |
| 2021-02-15 05:26:06 | Santiago Sharks | | Promoted | Julio Tung | San Diego Sabercats |
| 2021-02-14 12:15:14 | New York Warriors | | Demoted | Arthur Washer | Hartford Hebrew Hammers |
| 2021-02-14 12:14:48 | Hartford Hebrew Hammers | | Promoted | Frederick Sciortino | New York Warriors |
| 2021-02-14 11:54:00 | San Francisco Golden Gators | Duane Dunn | Acquired via waivers | | Waiver |
| 2021-02-14 11:54:00 | New York Warriors | Arthur Washer | Acquired via waivers | Gerald Campbell | Waiver |
| 2021-02-14 05:33:28 | South Dakota Blackhawks | | Promoted | Tyreek McGee | Philadelphia Assassins |
| 2021-02-14 05:32:16 | Philadelphia Assassins | | Drop | Charles Tyrrell | |
| 2021-02-13 20:48:34 | Baltimore Miners | | Drop | Justinas Staligis | |
| 2021-02-13 20:36:00 | Baltimore Miners | | Demoted | Reggie Wagner | Green Bay Miners |
| 2021-02-13 17:10:06 | New Orleans Hurricanes | | Demoted | Maury Matthews | Detroit Gear Daddies |
| 2021-02-13 16:53:34 | Detroit Gear Daddies | | Promoted | Cyril Mccusker | New Orleans Hurricanes |