| Date | Transaction |
| 02-28-2020 | Karl Lorch has retired from the Tennessee Tuxedos. |
| 12-16-2019 | The Tennessee Tuxedos have acquired Karl Lorch from the waiver wire. |
| 09-22-2019 | The Cleveland Ironmen have automatically waived Karl Lorch to comply with the 53-man roster limit. |
| 09-16-2019 | The Cleveland Ironmen have acquired Karl Lorch from the waiver wire. |
| 09-16-2019 | The Cleveland Ironmen have waived Karl Lorch. |
| 09-16-2019 | The Cleveland Ironmen have acquired Karl Lorch from the waiver wire. |
| 09-01-2019 | The Montreal Mastodon have waived Karl Lorch. |
| 08-11-2019 | The Montreal Mastodon have moved Eric Edmunds and Vince McCreary to the active roster. The Montreal Mastodon have moved Karl Lorch and John Greene to the inactive roster. |
| 09-02-2018 | The Montreal Mastodon have moved John Greene, Tommy Enyart, and Karl Lorch to the active roster. The Montreal Mastodon have moved Vince McCreary, Joey Cicero, and Eric Edmunds to the inactive roster. |
| 08-12-2018 | The Montreal Mastodon have placed Karl Lorch on the trade block. |
| 12-10-2017 | The Montreal Mastodon have moved Tony McKay to the active roster. The Montreal Mastodon have moved Karl Lorch to the inactive roster. |
| 10-15-2017 | The Montreal Mastodon have moved Karl Lorch to the active roster. The Montreal Mastodon have moved Vince McCreary to the inactive roster. |
| 09-17-2017 | The Montreal Mastodon have moved Bob Mailliard and Eric Edmunds to the active roster. The Montreal Mastodon have moved Karl Lorch and Russ Lucas to the inactive roster. |
| 09-17-2017 | Karl Lorch of the Montreal Mastodon is injured with an ACL sprain and is expected to be out for approximately 27 days. |
| 09-03-2017 | The Montreal Mastodon have moved John Greene, Karl Lorch, and Tommy Enyart to the active roster. The Montreal Mastodon have moved Tom McCullough, Eric Edmunds, and Joey Cicero to the inactive roster. |
| 04-30-2017 | The Montreal Mastodon have moved Frank Seaverns, Walt Schuber, Calvin Rosenbach, and Russ Lucas to the active roster. The Montreal Mastodon have moved Karl Lorch, Bill Hole, John Greene, and Lawrence Thompson to the inactive roster. |
| 09-04-2016 | The Montreal Mastodon have moved Karl Lorch, Eric Gardner, Tommy Enyart, and Eugene Delhomme to the active roster. The Montreal Mastodon have moved Eric Edmunds, Erik Hanke, and Walt Jackson to the inactive roster. |
| 05-01-2016 | The Montreal Mastodon have moved Eric Edmunds and Walt Jackson to the active roster. The Montreal Mastodon have moved Karl Lorch and Tommy Enyart to the inactive roster. |
| 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. |
| 08-16-2015 | The Montreal Mastodon have moved John Monachino, Blake Gallagher, Don Thompson, Eddie Syvrud, Ray Dyal, and Eric Edmunds to the active roster. The Montreal Mastodon have moved John McCall, Karl Lorch, Eric Gardner, Tommy Enyart, Eugene Delhomme, and Hank Burmeister to the inactive roster. |
| 09-22-2014 | The Montreal Mastodon have moved Karl Lorch to the active roster. The Montreal Mastodon have moved Dalva Allen to the inactive roster. |
| 09-22-2014 | The Montreal Mastodon have moved Dalva Allen to the active roster. The Montreal Mastodon have moved Karl Lorch to the inactive roster. |
| 09-22-2014 | Trade #87065 has been completed between the Montreal Mastodon and the Las Vegas Night Stalkers. The Las Vegas Night Stalkers receive Chris Neumann (S), Dwight Jancik (DE), Erik Heath (WR) from the Montreal Mastodon in exchange for Karl Lorch (DE). |
| 09-14-2014 | Karl Lorch of the Las Vegas Night Stalkers is injured with a hip muscle strain and is expected to be out for approximately 11 days. |
| 09-08-2013 | Karl Lorch of the Las Vegas Night Stalkers is injured with a quadricep contusion and is expected to be out for approximately 6 days. |
| 10-07-2012 | Karl Lorch of the Las Vegas Night Stalkers is injured with a rib fracture and is expected to be out for approximately 26 days. |
| 11-27-2011 | Karl Lorch of the Las Vegas Night Stalkers is injured with a severe concussion and is expected to be out for approximately 35 days. |
| 08-06-2007 | Trade #82239 has been completed between the Montreal Mastodon and the Las Vegas Omnipresent. The Las Vegas Omnipresent receive Karl Lorch (DE) from the Montreal Mastodon in exchange for Lamont Still (TE), Hank Burmeister (LB). |
| 09-17-2006 | The Montreal Mastodon have changed Kari Lorch's name to Karl Lorch. |
| 08-07-2006 | The Montreal Mastodon have moved Corey Deerslayer, Jeff Sivell, Kari Lorch, Pat Berger, and Bill Philcox to the active roster. The Montreal Mastodon have moved Daryl Woolfolk, Bill Gregory, Nick Macerelli, Don Williams, and Tom Elliott to the inactive roster. |
| 08-07-2006 | The Montreal Mastodon have changed Henry Abbruzzino's name to Kari Lorch. |
Defensive End