| 5/2/18 |
Oakland Athletics optioned RHP Emilio Pagan to Nashville Sounds. |
| 5/2/18 |
Oakland Athletics selected the contract of LHP Brett Anderson from Nashville Sounds. |
| 5/3/18 |
Oakland Athletics signed free agent LHP Dean Kiekhefer to a minor league contract. |
| 5/9/18 |
Oakland Athletics placed RHP Trevor Cahill on the 10-day disabled list retroactive to May 6, 2018. Right elbow impingement. |
| 5/9/18 |
Oakland Athletics recalled CF Dustin Fowler from Nashville Sounds. |
| 5/11/18 |
Oakland Athletics placed RF Stephen Piscotty on the bereavement list. |
| 5/11/18 |
Oakland Athletics recalled RHP Kendall Graveman from Nashville Sounds. |
| 5/15/18 |
Oakland Athletics activated RF Stephen Piscotty from the bereavement list. |
| 5/15/18 |
Oakland Athletics optioned RHP Kendall Graveman to Nashville Sounds. |
| 5/16/18 |
Oakland Athletics activated RHP Trevor Cahill from the 10-day disabled list. |
| 5/16/18 |
Oakland Athletics optioned CF Jake Smolinski to Nashville Sounds. |
| 5/17/18 |
Oakland Athletics placed C Bruce Maxwell on the restricted list. |
| 5/17/18 |
Oakland Athletics signed free agent RHP Yonatan De Leon to a minor league contract. |
| 5/17/18 |
Oakland Athletics signed free agent RHP Stiven Montilla to a minor league contract. |
| 5/17/18 |
Oakland Athletics signed free agent RHP Alexis Cedano to a minor league contract. |
| 5/17/18 |
Oakland Athletics recalled C Josh Phegley from Nashville Sounds. |
| 5/18/18 |
Oakland Athletics placed RHP Andrew Triggs on the 10-day disabled list. Right arm nerve irritation. |
| 5/18/18 |
Oakland Athletics optioned RHP Ryan Dull to Nashville Sounds. |
| 5/18/18 |
Oakland Athletics signed free agent LHP Yorlenis Noa to a minor league contract. |
| 5/18/18 |
Oakland Athletics recalled RHP Josh Lucas from Nashville Sounds. |
| 5/18/18 |
Oakland Athletics recalled RHP Emilio Pagan from Nashville Sounds. |
| 5/19/18 |
Oakland Athletics placed LHP Brett Anderson on the 10-day disabled list. Left should strain. |
| 5/19/18 |
Oakland Athletics recalled RHP Ryan Dull from Nashville Sounds. |
| 5/20/18 |
Oakland Athletics claimed RHP Carlos Ramirez off waivers from Toronto Blue Jays. |
| 5/21/18 |
Oakland Athletics activated C Bruce Maxwell from the restricted list. |
| 5/21/18 |
Oakland Athletics designated C Dustin Garneau for assignment. |
| 5/21/18 |
Oakland Athletics optioned C Josh Phegley to Nashville Sounds. |
