| 5/1/19 |
Oakland Athletics sent 1B Matt Olson on a rehab assignment to Las Vegas Aviators. |
| 5/2/19 |
Oakland Athletics optioned RHP Ryan Dull to Las Vegas Aviators. |
| 5/3/19 |
Oakland Athletics recalled CF Skye Bolt from Las Vegas Aviators. |
| 5/7/19 |
Oakland Athletics activated 1B Matt Olson from the 10-day injured list. |
| 5/7/19 |
Oakland Athletics optioned CF Skye Bolt to Las Vegas Aviators. |
| 5/8/19 |
Oakland Athletics sent OF Nick Martini on a rehab assignment to Las Vegas Aviators. |
| 5/10/19 |
Oakland Athletics sent CF Mark Canha on a rehab assignment to Las Vegas Aviators. |
| 5/11/19 |
Oakland Athletics traded RHP Edwin Jackson to Toronto Blue Jays for cash. |
| 5/12/19 |
Oakland Athletics optioned RHP J.B. Wendelken to Las Vegas Aviators. |
| 5/12/19 |
Oakland Athletics recalled RHP Daniel Mengden from Las Vegas Aviators. |
| 5/13/19 |
Oakland Athletics activated CF Mark Canha from the 10-day injured list. |
| 5/13/19 |
Oakland Athletics designated DH Kendrys Morales for assignment. |
| 5/14/19 |
Oakland Athletics traded DH Kendrys Morales and cash to New York Yankees for Player To Be Named Later. |
| 5/15/19 |
Oakland Athletics signed free agent LHP James Gonzalez to a minor league contract. |
| 5/17/19 |
Oakland Athletics sent RHP Jharel Cotton on a rehab assignment to Stockton Ports. |
| 5/18/19 |
Oakland Athletics signed free agent C Cameron Rupp to a minor league contract. |
