| Date | Transaction |
| 08-30-2038 | The Minnesota Wolves have waived Len Black. |
| 05-02-2038 | The Minnesota Wolves have acquired Len Black from the waiver wire. |
| 08-30-2037 | The Minnesota Wolves have waived Len Black. |
| 08-30-2037 | The Minnesota Wolves have moved Willie Nemecek, Lamar Sanford, Mike Gorgone, Tino Sommer, Gasper Svare, and Ric Brown to the active roster. The Minnesota Wolves have moved Len Black, Jim Hasselbach, Dion Deibel, Jerry Frost, Charlie Bellamy, and Tom Adamson to the inactive roster. |
| 08-10-2037 | The Minnesota Wolves have moved Len Black to the active roster. The Minnesota Wolves have moved Wade Niemi to the inactive roster. |
| 08-10-2037 | The Minnesota Wolves have acquired Len Black from the waiver wire. |
| 08-24-2036 | The Minnesota Wolves have waived Len Black. |
| 04-27-2036 | The Tampa Bay Hornets have moved Lew Donnell, Len Black, Jeff Pleasant, Tex Ashworth, and Ron Stams to the active roster. The Tampa Bay Hornets have moved William Buzin, Glenn Holdman, Tino Sommer, Elvis Keeling, and Chuck Douglass to the inactive roster. |
| 12-16-2035 | The Tampa Bay Hornets have moved Ron Stams to the active roster. The Tampa Bay Hornets have moved Len Black to the inactive roster. |
| 12-02-2035 | The Tampa Bay Hornets have acquired Len Black from the waiver wire. |
| 09-03-2034 | The Tampa Bay Hornets have moved Cody Bouley to the active roster. |
| 09-03-2034 | The Tampa Bay Hornets have waived Len Black. |
| 09-03-2034 | The Tampa Bay Hornets have moved Curtis Dasstling, Greg Partridge, Glenn Holdman, Kelvin Bercich, Dion Deibel, William Buzin, Forest Green, J.R. Stark, and Ric Brown to the active roster. The Tampa Bay Hornets have moved Dwight Williams, Adi Gallia, Jeff Pleasant, Ed Tomczak, Breezy Danehe, Karl Speer, Len Black, and Mike Greer to the inactive roster. |
| 08-13-2034 | The Tampa Bay Hornets have moved Mike Greer, Ted Ruh, Pete Moriarty, Sam Weiss, Karl Speer, and Len Black to the active roster. The Tampa Bay Hornets have moved William Buzin, David Haliburton, Roddy Wenke, Curtis Dasstling, Dion Deibel, and J.R. Stark to the inactive roster. |
| 01-02-2034 | The Tampa Bay Hornets have moved Forest Green to the active roster. The Tampa Bay Hornets have moved Len Black to the inactive roster. |
| 12-12-2033 | The Tampa Bay Hornets have moved Len Black to the active roster. The Tampa Bay Hornets have moved Pete Moriarty to the inactive roster. |
| 09-12-2033 | The Tampa Bay Hornets have acquired Len Black from the waiver wire. |
| 09-05-2033 | The Miami Xenomorphs have waived Len Black. |
| 09-05-2033 | The Miami Xenomorphs have moved Cecil Heffernan, Billy Carr, Marcus Helton, Bob Grove, Markus Hawkins, Jeff Wilkerson, Sam Ketzko, Dick Crouse, Hal Trocolor, Dan Jackson, Hersh Morgan, Jim Middleton, Champ Hauser, Coleman Tingelhoff, Emil Ameche, Ernie Hill, Verl Farr, Monty Berquist, Harold Polofsky, Charles Bundren, Tommy Plantz, and Hagood Evans to the active roster. The Miami Xenomorphs have moved Gary Tiller, Len Walker, Damian Boutte, Terry Hurt, Gunnard Reynolds, Alex Parsons, John Barnhardt, Dave Peat, Merlin Garrett, Daryl Woods, Len Black, Art Pool, George Gogolak, Rick Peebles, Steve Williams, George Lockett, Israel O'Neil, and Brady Peavey to the inactive roster. |
| 08-29-2033 | The Miami Xenomorphs have moved Marion Kapitansky, Emanuel George, Merlin Garrett, Cornelius Jackson, Stafford Minor, Dale Haliburton, Alex Parsons, Terry Hurt, Steve Williams, George Gogolak, Israel O'Neil, Len Black, Gary Tiller, Bill Roberts, and Gunnard Reynolds to the active roster. The Miami Xenomorphs have moved Markus Hawkins, Hal Trocolor, Sam Ketzko, Ernie Hill, Coleman Tingelhoff, Emil Ameche, Monty Berquist, Verl Farr, Champ Hauser, Harold Polofsky, Dick Crouse, Charles Bundren, Tommy Plantz, Hagood Evans, Billy Carr, Bob Grove, and Marcus Helton to the inactive roster. |
| 08-22-2033 | The Miami Xenomorphs have moved Cecil Heffernan, Verl Farr, Harold Polofsky, and Charles Bundren to the active roster. The Miami Xenomorphs have moved Ed Smith, Dale Haliburton, Len Black, and Steve Williams to the inactive roster. |
| 08-14-2033 | The Miami Xenomorphs have moved Len Walker, Ed Smith, Dale Haliburton, Harold Chamberlain, Gunnard Reynolds, Alex Parsons, Len Black, Steve Williams, Ben Johnson, Brady Peavey, Pike Poage, and Sam Wiethe to the active roster. The Miami Xenomorphs have moved Cecil Heffernan, Damian Boutte, Sam Ketzko, Emanuel George, Hersh Morgan, Darrin Pettigrew, Jim Middleton, Champ Hauser, Coleman Tingelhoff, Verl Farr, Harold Polofsky, and Charles Bundren to the inactive roster. |
| 05-01-2033 | The Miami Xenomorphs have acquired Len Black from the waiver wire. |
| 12-19-2032 | The Tampa Bay Hornets have automatically waived Len Black to comply with the 53-man roster limit. |
| 10-24-2032 | The Tampa Bay Hornets have moved Horatio Simmonds and Oscar May to the active roster. The Tampa Bay Hornets have moved Len Black and Frank Khayat to the inactive roster. |
| 10-17-2032 | The Tampa Bay Hornets have moved Len Black to the active roster. The Tampa Bay Hornets have moved Ed Secord to the inactive roster. |
| 09-06-2032 | The Tampa Bay Hornets have moved David Haliburton, Kelvin Bercich, Curtis Dasstling, Dion Deibel, J.R. Stark, and Forest Green to the active roster. The Tampa Bay Hornets have moved Alex Zamberlin, Grenny Wilson, Tyrone "Glass" Douglas, Cliff Lewis, Nat Imlay, and Len Black to the inactive roster. |
| 08-29-2032 | The Tampa Bay Hornets have moved Ted Ruh, Don Maher, and Len Black to the active roster. The Tampa Bay Hornets have moved Ricky Barrett, Forest Green, and Antonio Whitlach to the inactive roster. |
| 08-23-2032 | The Tampa Bay Hornets have acquired Len Black from the waiver wire. |
| 08-15-2032 | The Orlando Flippers have waived Len Black. |
Running Back