Great Lakes Loons Roster & Staff
Great Lakes Transactions
| Date | Transaction |
| 05/31/25 | Great Lakes Loons activated RHP Patrick Copen from the temporarily inactive list. |
| 05/29/25 | Great Lakes Loons placed CF Mike Sirota on the 7-day injured list. |
| 05/29/25 | Great Lakes Loons activated SS Wilman Diaz from the 7-day injured list. |
| 05/29/25 | Great Lakes Loons placed RHP Alex Makarewich on the 7-day injured list. |
| 05/28/25 | RHP Domingo Geronimo assigned to ACL Dodgers from Great Lakes Loons. |
| 05/27/25 | Great Lakes Loons sent OF Kyle Nevin on a rehab assignment to ACL Dodgers. |
| 05/27/25 | Great Lakes Loons sent LHP Maddux Bruns on a rehab assignment to ACL Dodgers. |
| 05/27/25 | Great Lakes Loons placed RHP Patrick Copen on the temporarily inactive list. |
| 05/27/25 | RHP Sean Linan assigned to Great Lakes Loons from Oklahoma City Comets. |
| 05/27/25 | 1B Easton Shelton assigned to Great Lakes Loons from ACL Dodgers. |
| 05/25/25 | Great Lakes Loons activated LHP Evan Shaw from the 7-day injured list. |
| 05/25/25 | RHP Payton Martin assigned to Great Lakes Loons from ACL Dodgers. |
| 05/23/25 | RHP Sean Linan assigned to Oklahoma City Comets from Great Lakes Loons. |
| 05/22/25 | Great Lakes Loons placed SS Wilman Diaz on the 7-day injured list. |
| 05/20/25 | RHP Domingo Geronimo assigned to Great Lakes Loons from Tulsa Drillers. |
| 05/18/25 | RHP Sean Linan assigned to Great Lakes Loons from Oklahoma City Comets. |
| 05/17/25 | RHP Sean Linan assigned to Oklahoma City Comets from Great Lakes Loons. |
| 05/16/25 | Great Lakes Loons activated RHP Eriq Swan from the 7-day injured list. |
| 05/16/25 | Great Lakes Loons activated RHP Christian Romero from the 7-day injured list. |
| 05/15/25 | OF Nick Biddison assigned to Tulsa Drillers from Great Lakes Loons. |
| 05/14/25 | Great Lakes Loons transferred RHP Brooks Auger to the Development List. |
| 05/14/25 | Great Lakes Loons placed LHP Evan Shaw on the 7-day injured list. |
| 05/14/25 | Great Lakes Loons activated 3B Jake Gelof from the 7-day injured list. |
| 05/13/25 | CF Mike Sirota assigned to Great Lakes Loons from Rancho Cucamonga Quakes. |
| 05/13/25 | OF Kole Myers assigned to Tulsa Drillers from Great Lakes Loons. |
| 05/08/25 | RHP Livan Reinoso assigned to Tulsa Drillers from Great Lakes Loons. |
| 05/08/25 | RHP Alex Makarewich assigned to Great Lakes Loons from Rancho Cucamonga Quakes. |
| 05/08/25 | RHP Sean Linan assigned to Great Lakes Loons from Rancho Cucamonga Quakes. |
| 05/07/25 | Great Lakes Loons placed RHP Christian Romero on the 7-day injured list retroactive to May 5, 2025. |
| 05/07/25 | Great Lakes Loons placed RHP Eriq Swan on the 7-day injured list. |
| 05/06/25 | Great Lakes Loons activated OF Nick Biddison. |
| 05/06/25 | Great Lakes Loons activated OF Nick Biddison. |
| 05/06/25 | Great Lakes Loons activated OF Nick Biddison. |
| 05/06/25 | SS Mairoshendrick Martinus assigned to ACL Dodgers from Great Lakes Loons. |
| 05/03/25 | Great Lakes Loons sent 3B Jake Gelof on a rehab assignment to ACL Dodgers. |
| 05/03/25 | Great Lakes Loons sent OF Nick Biddison on a rehab assignment to ACL Dodgers. |
| 05/03/25 | Great Lakes Loons sent 3B Jake Gelof on a rehab assignment to ACL Dodgers. |