| 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. |
| 1921.1 | 2023-05-16 | Holyoke Purple Knights trade Bill Killefer, Clarence Mitchell, Joe Dugan, Ray Grimes, and HOL 1921 #2 to the Cooperstown Giants for Ernie Krueger, Ivy Olson, Jake Daubert, Possum Whitted, and COO 1921 #1. |