| 8/1/19 |
Oakland Athletics released RHP Andrew Triggs. |
| 8/2/19 |
Oakland Athletics activated RHP Tanner Roark. |
| 8/2/19 |
Oakland Athletics optioned RHP Daniel Mengden to Las Vegas Aviators. |
| 8/2/19 |
Oakland Athletics optioned 2B Franklin Barreto to Las Vegas Aviators. |
| 8/3/19 |
Oakland Athletics activated RF Stephen Piscotty from the 10-day injured list. |
| 8/3/19 |
Oakland Athletics designated RHP Ryan Dull for assignment. |
| 8/3/19 |
Oakland Athletics optioned C Beau Taylor to Las Vegas Aviators. |
| 8/3/19 |
Oakland Athletics optioned 2B Franklin Barreto to Las Vegas Aviators. |
| 8/3/19 |
Oakland Athletics claimed C Dustin Garneau off waivers from Los Angeles Angels. |
| 8/5/19 |
San Francisco Giants claimed RHP Ryan Dull off waivers from Oakland Athletics. |
| 8/11/19 |
Oakland Athletics sent C Josh Phegley on a rehab assignment to Las Vegas Aviators. |
| 8/14/19 |
Oakland Athletics designated C Beau Taylor for assignment. |
| 8/14/19 |
Oakland Athletics optioned LF Nick Martini to Las Vegas Aviators. |
| 8/14/19 |
Oakland Athletics selected the contract of 2B Corban Joseph from Las Vegas Aviators. |
| 8/15/19 |
Oakland Athletics sent C Josh Phegley on a rehab assignment to Stockton Ports. |
| 8/16/19 |
Oakland Athletics activated C Josh Phegley from the 10-day injured list. |
| 8/16/19 |
Oakland Athletics sent RHP Marco Estrada on a rehab assignment to Las Vegas Aviators. |
| 8/16/19 |
Oakland Athletics designated C Dustin Garneau for assignment. |
| 8/16/19 |
Toronto Blue Jays claimed C Beau Taylor off waivers from Oakland Athletics. |
| 8/17/19 |
Oakland Athletics signed free agent RHP Matt Harvey to a minor league contract. |
| 8/19/19 |
Oakland Athletics optioned LHP Wei-Chung Wang to Las Vegas Aviators. |
| 8/19/19 |
Oakland Athletics sent C Dustin Garneau outright to Las Vegas Aviators. |
| 8/20/19 |
Oakland Athletics released RHP Marco Estrada. |
| 8/20/19 |
Oakland Athletics selected the contract of LHP A.J. Puk from Las Vegas Aviators. |
