| Player | Team | Action | Details | |
|---|---|---|---|---|
| Felix Hernandez | Cowboys From Hell | ADD | to MLB | 2:03 pm, 8/15/18 |
| Jorge Lopez | Supreme Clientele | ADD | to AAA | 12:38 am, 8/15/18 |
| Denard Span | The Bluth Company | ADD | to MLB | 7:57 pm, 8/14/18 |
| Edwin Rios | Ye Olde Tom Toolshed | ADD | to AAA | 4:36 pm, 8/14/18 |
| Jedd Gyorko | Ye Olde Tom Toolshed | ADD | to MLB | 4:35 pm, 8/14/18 |
| Trevor May | Ye Olde Tom Toolshed | ADD | to MLB | 4:29 pm, 8/14/18 |
| Justin Anderson | Shaolin Schmeckles | ADD | to MLB | 3:52 pm, 8/14/18 |
| James McCann | Geckos | ADD | to MLB | 11:12 am, 8/14/18 |
| Seth Lugo | The Red Barons | ADD | to MLB | 3:19 am, 8/14/18 |
| Dustin Fowler | The Bluth Company | ADD | to AAA | 4:52 pm, 8/13/18 |
| Brett Anderson | Supreme Clientele | ADD | to MLB | 3:44 pm, 8/13/18 |
| Matt Boyd | Supreme Clientele | ADD | to MLB | 3:44 pm, 8/13/18 |
| Mychal Givens | Supreme Clientele | ADD | to MLB | 3:44 pm, 8/13/18 |
| Corey Oswalt | Shaolin Schmeckles | ADD | to AA | 1:57 pm, 8/13/18 |
| Artie Lewicki | Chinballs | ADD | to MLB | 1:16 pm, 8/13/18 |
| Christian Villanueva | Purple Cobras | ADD | to MLB | 1:05 pm, 8/13/18 |
| Koda Glover | The Bluth Company | ADD | to AAA | 12:26 am, 8/13/18 |
| Daniel Palka | Purple Cobras | ADD | to MLB | 2:58 pm, 8/11/18 |
| Adam Conley | Hill Valley Preservation Society | ADD | to MLB | 11:42 am, 8/11/18 |
| David Freese | Purple Cobras | ADD | to MLB | 7:39 am, 8/11/18 |
| Kevin Kiermaier | Bridge Four | ADD | to MLB | 6:26 pm, 8/10/18 |
| Jason Heyward | Bridge Four | ADD | to MLB | 6:25 pm, 8/10/18 |
| Cedric Mullins | The Bluth Company | ADD | to AAA | 3:42 pm, 8/10/18 |
| Ramon Laureano | Purple Cobras | ADD | to AAA | 6:13 am, 8/10/18 |
| Russell Martin | Bridge Four | ADD | to MLB | 5:06 pm, 8/9/18 |