| Trans Num | Date | Details |
| 2006.27 | 2021-06-06 | Omaha Knights trade Dontrelle Willis and OMA 2007 #3 to the Detroit Stars for Nate Robertson. |
| 2006.11 | 2021-03-28 | San Francisco Sea Serpents trade Ken Griffey and Nate Robertson to the Detroit Stars for Brian Bruney and Coco Crisp. |