| Player | Team | Action | Details | |
|---|---|---|---|---|
| Dallas Keuchel | Bullet Club | ADD | to MLB | 7:01 am, 9/3/21 |
| Jose Siri | Bullet Club | ADD | to AAA | 5:59 am, 9/3/21 |
| Joey Wendle | Purple Cobras | ADD | to MLB | 3:52 am, 9/3/21 |
| Jose Suarez | The Bluth Company | ADD | to AAA | 6:47 pm, 9/2/21 |
| Hector Neris | Undead Rabbits | ADD | to MLB | 5:51 pm, 9/2/21 |
| Jorge Alfaro | Bullet Club | ADD | to MLB | 4:24 pm, 9/2/21 |
| Trevor Stephan | Ye Olde Tom Toolshed | ADD | to MLB | 2:25 pm, 9/2/21 |
| Paolo Espino | Ye Olde Tom Toolshed | ADD | to MLB | 2:25 pm, 9/2/21 |
| Jalen Beeks | The Red Barons | ADD | to MLB | 9:36 am, 9/2/21 |
| Yu Chang | Cowboys From Hell | ADD | to MLB | 8:50 am, 9/2/21 |
| Josh Harrison | Purple Cobras | ADD | to MLB | 8:16 am, 9/2/21 |
| Gavin Sheets | The Bluth Company | ADD | to AAA | 11:46 pm, 9/1/21 |
| Jake Junis | Bullet Club | ADD | to MLB | 2:29 pm, 9/1/21 |
| Pedro Severino | The Red Barons | ADD | to MLB | 12:05 pm, 9/1/21 |
| Andrew Chafin | The Red Barons | ADD | to MLB | 12:05 pm, 9/1/21 |
| Pete Fairbanks | Ye Olde Tom Toolshed | ADD | to MLB | 12:52 pm, 8/31/21 |
| Jose Marmolejos | The Red Barons | ADD | to MLB | 12:06 pm, 8/31/21 |
| Yoshitomo Tsutsugo | The Red Barons | ADD | to MLB | 12:06 pm, 8/31/21 |
| Jarlin Garcia | The Red Barons | ADD | to MLB | 12:05 pm, 8/31/21 |
| Chris Stratton | The Red Barons | ADD | to MLB | 12:05 pm, 8/31/21 |
| Jeremy Pena | The Bluth Company | ADD | to NA | 11:34 am, 8/31/21 |
| Dustin Harris | The Bluth Company | ADD | to AA | 11:32 am, 8/31/21 |
| Jorge Alfaro | The Red Barons | ADD | to MLB | 6:51 am, 8/31/21 |
| Gio Urshela | The Red Barons | ADD | to MLB | 6:51 am, 8/31/21 |
| D.J. Peters | Bullet Club | ADD | to MLB | 7:52 pm, 8/30/21 |