| Trans Num | Date | Details |
| 1928.4 | 2024-05-22 | Mannheim Steamrollers trade Jack Rothrock, Jim Weaver, and MAN 1929 #1 to the Cooperstown Giants for Riggs Stephenson. |
| 1925.6 | 2023-12-08 | Cooperstown Giants trade Dave Danforth, Dixie Davis, Ernie Johnson, Ernie Padgett, Pete Alexander, and Ralph Michaels to the Mannheim Steamrollers for Carmen Hill, Jesse Petty, Riggs Stephenson, and MAN 1926 #1. |
| 1921.5 | 2023-05-21 | Mannheim Steamrollers trade Joe Bush to the Holyoke Purple Knights for Riggs Stephenson. |