| Date | Transaction |
| 02-28-2017 | Gabriel Rivera has retired from football. |
| 08-22-2016 | The Cleveland Ironmen have waived Gabriel Rivera. |
| 08-15-2016 | The Cleveland Ironmen have moved Mike LaHood to the active roster. The Cleveland Ironmen have moved Gabriel Rivera to the inactive roster. |
| 08-08-2016 | The Cleveland Ironmen have moved Bob Dee, George Steele, Dalva Allen, and Gabriel Rivera to the active roster. The Cleveland Ironmen have moved Joe Duquesne, Jack Zilly, Bill Line, and Mel Tom to the inactive roster. |
| 02-01-2016 | The Cleveland Ironmen have acquired Gabriel Rivera 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. |
| 02-01-2016 | The Cleveland Ironmen have waived Gabriel Rivera. |
| 02-01-2016 | The Cleveland Ironmen have acquired Gabriel Rivera 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. |
| 02-01-2016 | The Cleveland Ironmen have waived Gabriel Rivera. |
| 02-01-2016 | The Cleveland Ironmen have acquired Gabriel Rivera from the waiver wire. |
| 09-07-2015 | The Montreal Mastodon have waived Gabriel Rivera. |
| 09-06-2015 | The Montreal Mastodon have moved John McCall, Karl Lorch, Tommy Enyart, and Hank Burmeister to the active roster. The Montreal Mastodon have moved Blake Gallagher, Gordie Treat, Harry Moore, and Gabriel Rivera to the inactive roster. |
| 08-12-2013 | Trade #86177 has been completed between the Cleveland Ironmen and the Montreal Mastodon. The Montreal Mastodon receive Gabriel Rivera (DT) from the Cleveland Ironmen in exchange for Bucky McAdams (DT). |
| 08-12-2013 | The Cleveland Ironmen have moved Gabriel Rivera to the active roster. The Cleveland Ironmen have moved Paul Rochester to the inactive roster. |
| 08-12-2013 | The Cleveland Ironmen have acquired Gabriel Rivera from the waiver wire. |
| 08-05-2013 | The Miami Cobras have waived Gabriel Rivera. |
| 12-31-2012 | The Miami Cobras have moved Victor Miller, Doc Maronic, and John Johnson to the active roster. The Miami Cobras have moved Gloster Collins, Gabriel Rivera, and Fred Zachary to the inactive roster. |
| 01-01-2012 | Gabriel Rivera of the Miami Cobras is injured with a leg contusion and is expected to be out for approximately 2 days. |
| 11-13-2011 | Gabriel Rivera of the Miami Cobras is injured with a wrist inflammation and is expected to be out for approximately 10 days. |
| 11-06-2011 | The Miami Cobras have moved Gabriel Rivera and James McCurry to the active roster. The Miami Cobras have moved Doc Maronic to the inactive roster. |
| 11-06-2011 | The Miami Cobras have acquired Gabriel Rivera from the waiver wire. |
| 09-05-2011 | The Dallas Blah have waived Gabriel Rivera. |
| 08-29-2011 | The Dallas Blah have acquired Gabriel Rivera from the waiver wire. |
| 08-22-2011 | The Cleveland Ironmen have waived Gabriel Rivera. |
| 08-22-2011 | The Cleveland Ironmen have moved John Mackey, Warren Wells, Roger Pillath, Leland Glass, Jabo Biggs, Joe Lukens, Joe Niagara, Monte Clark, John Van Boxmeer, Lamar Lundy, and Steve Luke to the active roster. The Cleveland Ironmen have moved Van Brownson, Bobbie Hodges, Jesse Owens, Elmore James, Cool Papa Bell, Raymond Smith, Carl White, Glen Weir, Grant Lee, Jack Mackalavage, Curtis Nolan, Drane Scrivener, Dave Munchak, Gabriel Rivera, and Bill Roe to the inactive roster. |
| 08-08-2011 | The Cleveland Ironmen have moved Tom Darkins, Russell Crafts, Happy Hairston, Wilson Whitley, Ed Snell, Vinny Vanzo, Mike Fox, Gabriel Rivera, Raymond Smith, Mel Hultz, Jozo Brcic, and Ralph Graham to the active roster. The Cleveland Ironmen have moved Lamar Lundy, Jack Tatum, Rickey Orange, Joe Duquesne, Steve Luke, Bob Babich, Bob Jeter, Mike Guess, Tom Day, Dick Butkus, Jabo Biggs, and Willie Wood to the inactive roster. |
| 01-31-2011 | The Cleveland Ironmen have acquired Gabriel Rivera 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. |
| 01-31-2011 | The Cleveland Ironmen have waived Gabriel Rivera. |
| 01-31-2011 | The Cleveland Ironmen have acquired Gabriel Rivera from the waiver wire. |
| 08-09-2010 | The Cleveland Ironmen have moved Clyde Burruss to the active roster. The Cleveland Ironmen have moved Happy Hairston to the inactive roster. |
| 08-09-2010 | The Cleveland Ironmen have waived Gabriel Rivera. |
| 08-09-2010 | The Cleveland Ironmen have moved Herb Merkle, Hank Walker, Greg Lawson, Chris Collins, Bob Turpin, Dick Stehouwer, John Starkey, and Jim Brooks to the active roster. The Cleveland Ironmen have moved Dave Green, Jim Kregel, Jim Haddix, Ron Colter, Clyde Burruss, Gabriel Rivera, Chris Brown, and Jack Mackalavage to the inactive roster. |
| 05-02-2010 | The Cleveland Ironmen have changed Henry Rivera's name to Gabriel Rivera. |
| 05-02-2010 | The Cleveland Ironmen have moved D'Artagnan Marquis, Tony Yoho, Greg Richardson, Skitch Henderson, and Henry Rivera to the active roster. |
| 05-02-2010 | The Cleveland Ironmen have acquired Henry Rivera from the waiver wire. |
| 09-06-2009 | The Providence Radiologist have waived Henry Rivera. |
| 09-06-2009 | The Providence Radiologist have placed Henry Rivera on the trade block. |
| 09-06-2009 | The Providence Radiologist have moved Computed Tomorgraphy to the active roster. The Providence Radiologist have moved Henry Rivera to the inactive roster. |
| 05-03-2009 | The Providence Radiologist have moved Henry Rivera to the active roster. The Providence Radiologist have moved Steve Fulcher to the inactive roster. |
| 05-03-2009 | The Providence Radiologist have acquired Henry Rivera from the waiver wire. |
| 09-01-2008 | The Miami Cobras have waived Henry Rivera. |
| 09-01-2008 | The Miami Cobras have moved Reggie Elmendorf, Boomer Van Raaphorst, Paul Landry, Vince Hegman, Frank Foster, and Tom Nash to the active roster. The Miami Cobras have moved Clint Willis, Chet Koeninger, Fifth Power, Doug Harris, Henry Rivera, and Lyle Skow to the inactive roster. |
| 12-10-2007 | The Miami Cobras have moved Merritt Mirer, Ron Buchanan, Pete Bruno, Fred Zachary, Henry Rivera, and Rich Underwood to the active roster. The Miami Cobras have moved Vince Hegman, Merwin Etelman, D'Artagnan Marquis, Paul Landry, J.D. Shufelt, and Dave Perrin to the inactive roster. |
| 11-18-2007 | The Miami Cobras have moved Vince Hegman to the active roster. The Miami Cobras have moved Henry Rivera to the inactive roster. |
| 10-15-2007 | The Miami Cobras have moved Henry Rivera and Tony Everett to the active roster. The Miami Cobras have moved Tom Barni and Vince Hegman to the inactive roster. |
| 09-09-2007 | The Miami Cobras have moved Paul Landry, Vince Hegman, and Tom Nash to the active roster. The Miami Cobras have moved Merritt Mirer, Tom Coleman, and Henry Rivera to the inactive roster. |
| 01-01-2007 | The Miami Cobras have moved Mike Wildung, Tom Coleman, Henry Rivera, and Rich Underwood to the active roster. The Miami Cobras have moved Sam Booth, Willie Mayfield, Harvey Ray, and Tom Nash to the inactive roster. |
| 09-04-2006 | The Miami Cobras have moved Willie Mayfield, Paul Landry, Vince Hegman, and Tom Nash to the active roster. The Miami Cobras have moved Greg Harris, Joe Lopasky, Henry Rivera, and Light Photons to the inactive roster. |
| 08-07-2006 | The Miami Cobras have moved Henry Rivera and Tony Everett to the active roster. The Miami Cobras have moved Tom Barni and Vince Hegman to the inactive roster. |
Defensive Tackle