| Date | Transaction |
| 02-28-2014 | John Roberts has retired from the Cleveland Ironmen. |
| 01-27-2014 | The Cleveland Ironmen have acquired John Roberts from the waiver wire; however, as he was traded or waived after the deadline and has not spent a full week on the wire, he will not be eligible for the postseason. |
| 01-27-2014 | The Cleveland Ironmen have waived John Roberts. |
| 01-27-2014 | The Cleveland Ironmen have acquired John Roberts from the waiver wire. |
| 08-25-2013 | The Cleveland Ironmen have automatically waived John Roberts to comply with the 65-man roster limit. |
| 08-19-2013 | The Cleveland Ironmen have moved John Roberts to the inactive roster. |
| 08-05-2013 | The Cleveland Ironmen have moved Tom Mandarich, John Roberts, Rod Ferris, and Jack Mackalavage to the active roster. The Cleveland Ironmen have moved Bruce Tarbox, Andy Ballantine, Dick Himes, and Terry Falcon to the inactive roster. |
| 01-28-2013 | The Cleveland Ironmen have acquired John Roberts from the waiver wire; however, as he was traded or waived after the deadline and has not spent a full week on the wire, he will not be eligible for the postseason. |
| 01-28-2013 | The Cleveland Ironmen have waived John Roberts. |
| 01-28-2013 | The Cleveland Ironmen have acquired John Roberts from the waiver wire. |
| 11-04-2012 | The Cleveland Ironmen have automatically waived John Roberts to comply with the 53-man roster limit. |
| 10-29-2012 | The Cleveland Ironmen have acquired John Roberts from the waiver wire. |
| 10-21-2012 | The Cleveland Ironmen have automatically waived John Roberts to comply with the 53-man roster limit. |
| 10-08-2012 | The Cleveland Ironmen have acquired John Roberts from the waiver wire. |
| 10-08-2012 | The Cleveland Ironmen have waived John Roberts. |
| 10-08-2012 | The Cleveland Ironmen have acquired John Roberts from the waiver wire. |
| 09-16-2012 | The Dallas Blah have automatically waived John Roberts to comply with the 53-man roster limit. |
| 09-10-2012 | The Dallas Blah have acquired John Roberts from the waiver wire. |
| 09-10-2012 | The Dallas Blah have moved Hugo Hall to the active roster. The Dallas Blah have moved Larry Brooks to the inactive roster. |
| 09-10-2012 | The Dallas Blah have waived John Roberts. |
| 08-13-2012 | The Dallas Blah have moved Dooude to the active roster. The Dallas Blah have moved John Roberts to the inactive roster. |
| 12-26-2011 | The Dallas Blah have moved John Roberts to the active roster. The Dallas Blah have moved Ketond Thistle to the inactive roster. |
| 12-26-2011 | The Dallas Blah have acquired John Roberts from the waiver wire. |
| 12-25-2011 | The Dallas Blah have automatically waived John Roberts to comply with the 53-man roster limit. |
| 10-30-2011 | The Dallas Blah have moved Computed Tomorgraphy to the active roster. The Dallas Blah have moved John Roberts to the inactive roster. |
| 08-15-2011 | The Dallas Blah have moved John Roberts to the active roster. The Dallas Blah have moved Intensifier Tube to the inactive roster. |
| 08-15-2011 | The Dallas Blah have acquired John Roberts from the waiver wire. |
| 08-08-2011 | The Montreal Mastodon have waived John Roberts. |
| 08-08-2011 | The Montreal Mastodon have moved Chad Ingle to the active roster. The Montreal Mastodon have moved John Roberts to the inactive roster. |
| 12-14-2008 | The Montreal Mastodon have moved John Roberts to the active roster. The Montreal Mastodon have moved Joe Johnson to the inactive roster. |
| 10-12-2008 | The Montreal Mastodon have moved Ralph Brown to the active roster. The Montreal Mastodon have moved John Roberts to the inactive roster. |
| 10-05-2008 | John Roberts of the Montreal Mastodon is injured with a rib fracture and is expected to be out for approximately 24 days. |
| 08-24-2008 | The Montreal Mastodon have moved John Roberts to the active roster. The Montreal Mastodon have moved Ralph Brown to the inactive roster. |
| 10-28-2007 | The Montreal Mastodon have moved Harry Moore and Anthony Ross to the active roster. The Montreal Mastodon have moved John Roberts and Corey Deerslayer to the inactive roster. |
| 10-28-2007 | John Roberts of the Montreal Mastodon is injured with a shoulder ligament sprain and is expected to be out for approximately 20 days. |
| 09-02-2007 | The Montreal Mastodon have moved Sal Sally, John Roberts, Ben Lahr, and Tom Thayer to the active roster. The Montreal Mastodon have moved Pat Berger and Gerhard Racis to the inactive roster. |
| 08-19-2007 | The Montreal Mastodon have moved Larry Hanson, Tom Sestak, George Mike-Mayer, Gerhard Racis, and Dutch Tyrer to the active roster. The Montreal Mastodon have moved John Roberts, Alex Morris, Johnny Branch, Sal Sally, and Tom Thayer to the inactive roster. |
| 01-02-2006 | The Montreal Mastodon have moved John Roberts to the active roster. The Montreal Mastodon have moved Terry Marshall to the inactive roster. |
| 01-01-2006 | The Montreal Mastodon have moved Terry Marshall to the active roster. The Montreal Mastodon have moved John Roberts to the inactive roster. |
| 12-25-2005 | John Roberts of the Montreal Mastodon is injured with a leg contusion and is expected to be out for approximately 10 days. |
| 08-29-2004 | The Montreal Mastodon have moved John Roberts, Les Harrison, Ben Lahr, and Dana Griffen to the active roster. The Montreal Mastodon have moved Chukky Shipp, Derrick Alliston, Gerhard Racis, and Jim Esiason to the inactive roster. |
| 08-22-2004 | The Montreal Mastodon have moved Carl Nutten to the active roster. The Montreal Mastodon have moved John Roberts to the inactive roster. |
| 11-10-2002 | The Montreal Mastodon have moved John Roberts to the active roster. The Montreal Mastodon have moved Bryan Graham to the inactive roster. |
| 11-04-2002 | The Montreal Mastodon have moved Bryan Graham and Jake Yaccino to the active roster. The Montreal Mastodon have moved Bill Gregory and John Roberts to the inactive roster. |
| 11-03-2002 | John Roberts of the Montreal Mastodon is injured with a mild concussion and is expected to be out for approximately 7 days. |
| 08-09-1999 | The Montreal Mastodon have moved Mike Hall and John Roberts to the active roster. The Montreal Mastodon have moved Billy Watson and Johnny Perry to the inactive roster. |
Tackle