| Date | Transaction |
| 02-28-2013 | Howie Slaton has retired from football. |
| 09-05-2011 | The Dallas Blah have waived Howie Slaton. |
| 12-20-2010 | The Dallas Blah have moved Howie Slaton to the active roster. |
| 12-20-2010 | The Dallas Blah have acquired Howie Slaton from the waiver wire. |
| 12-12-2010 | The Dallas Blah have waived Howie Slaton. |
| 12-12-2010 | The Dallas Blah have reverted Modified Swallow's name to Howie Slaton. |
| 10-11-2010 | The Dallas Blah have moved Modified Swallow to the active roster. |
| 10-10-2010 | The Dallas Blah have moved Modified Swallow to the inactive roster. |
| 01-11-2010 | The Providence Radiologist have moved Modified Swallow to the active roster. The Providence Radiologist have moved Latent Image to the inactive roster. |
| 01-11-2010 | The Providence Radiologist have moved Computed Tomorgraphy to the active roster. The Providence Radiologist have moved Modified Swallow to the inactive roster. |
| 09-10-2007 | The Providence Radiologist have moved Modified Swallow to the active roster. |
| 09-10-2007 | The Providence Radiologist have moved Derrick Griffen to the active roster. The Providence Radiologist have moved Modified Swallow to the inactive roster. |
| 09-05-2005 | The Providence Devine have moved Modified Swallow to the active roster. |
| 08-21-2005 | The Providence Devine have moved Luminance Ratio to the active roster. The Providence Devine have moved Modified Swallow to the inactive roster. |
| 08-21-2005 | The Providence Devine have moved Modified Swallow and Polarizing Lenses to the active roster. |
| 08-08-2005 | The Providence Devine have changed Howie Slaton's name to Modified Swallow. |
| 11-29-2004 | The Providence Devine have changed Howie Slaton's name to Howie Slaton. |
| 10-04-2004 | The Providence Devine have acquired Howie Slaton from the waiver wire. |
| 09-26-2004 | The Memphis Mephitic Miasma have waived Howie Slaton. |
| 10-27-2002 | The Memphis Vanguard have moved Howie Slaton to the active roster. The Memphis Vanguard have moved Shevin Hanson to the inactive roster. |
| 10-20-2002 | The Memphis Vanguard have acquired Howie Slaton from the waiver wire. |
| 10-13-2002 | The San Diego Pirates have automatically waived Howie Slaton to comply with the 53-man roster limit. |
| 09-02-2002 | The San Diego Pirates have moved Marcus Rowell, Glenn Hetherington, Joe Eason, and Jack Skansi to the active roster. The San Diego Pirates have moved Ray Graham, Howie Slaton, and Tom Coleman to the inactive roster. |
| 04-28-2002 | The San Diego Pirates have moved Ray Graham, Mike Wildung, Howie Slaton, Dave Perrin, and Garry McDonald to the active roster. The San Diego Pirates have moved Roy Lunday, David Heldt, Corey Hicks, Glenn Hetherington, Troy DeMarco, and Michael Simpson to the inactive roster. |
| 12-30-2001 | The San Diego Pirates have acquired Howie Slaton from the waiver wire. |
| 09-09-2001 | The Providence Devine have automatically waived Howie Slaton to comply with the 53-man roster limit. |
| 08-27-2001 | The Providence Devine have moved Jim Kirby to the active roster. The Providence Devine have moved Howie Slaton to the inactive roster. |
| 11-19-2000 | The Providence Devine have moved Howie Slaton to the active roster. The Providence Devine have moved Eldon Williams to the inactive roster. |
| 10-09-2000 | The Providence Devine have moved Jerry Lewis to the active roster. The Providence Devine have moved Howie Slaton to the inactive roster. |
| 08-14-2000 | The Providence Devine have moved Howie Slaton to the active roster. |
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