| Trans Num | Date | Details |
| 1921.8 | 2023-05-25 | Cooperstown Giants trade Bill Killefer, Bill Piercy, Elmer Miller, Heinie Mueller, Mickey O'Neil, COO 1922 #2, and COO 1922 #3 to the Alamo Defenders for Ray Powell and Wally Schang. |
| 1920.4 | 2023-03-24 | Cooperstown Giants trade COO 1920 #1 and COO 1920 #2 to the Holyoke Purple Knights for Johnny Mostil and Mickey O'Neil. |