Athletics Roster & Staff
Transactions
| Date | Transaction |
| 07/31/19 | Oakland Athletics recalled Nick Martini from Las Vegas Aviators. |
| 07/31/19 | Oakland Athletics placed CF Ramon Laureano on the 10-day injured list retroactive to July 29, 2019. Right lower leg stress reaction. |
| 07/31/19 | Cincinnati Reds traded RHP Tanner Roark to Oakland Athletics. |
| 07/31/19 | Oakland Athletics signed free agent RHP Nathan Patterson to a minor league contract. |
| 07/31/19 | Oakland Athletics traded CF Jameson Hannah to Cincinnati Reds. |
| 07/31/19 | Oakland Athletics recalled Beau Taylor from Las Vegas Aviators. |
| 07/31/19 | Oakland Athletics sent RHP Brian Schlitter outright to Las Vegas Aviators. |
| 07/31/19 | Oakland Athletics placed C Josh Phegley on the 10-day injured list retroactive to July 29, 2019. Left thumb contusion |
| 07/31/19 | Oakland Athletics designated RHP Andrew Triggs for assignment. |
| 07/30/19 | Oakland Athletics sent RHP Marco Estrada on a rehab assignment to Stockton Ports. |
| 07/29/19 | Oakland Athletics designated RHP Brian Schlitter for assignment. |
| 07/29/19 | Oakland Athletics optioned RHP Jharel Cotton to Las Vegas Aviators. |
| 07/29/19 | Oakland Athletics signed free agent RHP Franyelson Rodriguez to a minor league contract. |
| 07/29/19 | Oakland Athletics reassigned RHP Jharel Cotton to the minor leagues. |
| 07/29/19 | Oakland Athletics activated LHP Jake Diekman. |
| 07/27/19 | Kansas City Royals traded LHP Jake Diekman to Oakland Athletics for Dairon Blanco and Ismael Aquino. |
| 07/27/19 | Oakland Athletics released C Nick Hundley. |
| 07/27/19 | Kansas City Royals traded LHP Jake Diekman to Oakland Athletics for Dairon Blanco and Ismael Aquino. |
| 07/27/19 | Kansas City Royals traded LHP Jake Diekman to Oakland Athletics for Dairon Blanco and Ismael Aquino. |
| 07/27/19 | Oakland Athletics sent RF Stephen Piscotty on a rehab assignment to Las Vegas Aviators. |
| 07/25/19 | Oakland Athletics activated LHP Brett Anderson from the paternity list. |
| 07/25/19 | Oakland Athletics sent RHP Marco Estrada on a rehab assignment to AZL Athletics Gold. |
| 07/24/19 | Oakland Athletics activated C Nick Hundley from the 10-day injured list. |
| 07/24/19 | Oakland Athletics optioned RHP Tanner Anderson to Las Vegas Aviators. |
| 07/24/19 | Oakland Athletics designated C Nick Hundley for assignment. |
| 07/23/19 | Oakland Athletics sent LHP Sean Manaea on a rehab assignment to Las Vegas Aviators. |
| 07/23/19 | Oakland Athletics recalled Tanner Anderson from Las Vegas Aviators. |
| 07/23/19 | Oakland Athletics optioned LF Nick Martini to Las Vegas Aviators. |
| 07/22/19 | Oakland Athletics recalled Nick Martini from Las Vegas Aviators. |
| 07/22/19 | Oakland Athletics placed LHP Brett Anderson on the paternity list. |
| 07/17/19 | Oakland Athletics sent C Nick Hundley on a rehab assignment to Stockton Ports. |
| 07/16/19 | Oakland Athletics optioned RHP J.B. Wendelken to Las Vegas Aviators. |
| 07/16/19 | Oakland Athletics activated RHP Homer Bailey. |
| 07/15/19 | Oakland Athletics selected the contract of 2B Dan Gamache from Lancaster Barnstormers. |
| 07/15/19 | Oakland Athletics optioned RHP J.B. Wendelken to Las Vegas Aviators. |
| 07/14/19 | Kansas City Royals traded RHP Homer Bailey to Oakland Athletics for SS Kevin Merrell. |
| 07/14/19 | Kansas City Royals traded RHP Homer Bailey to Oakland Athletics for SS Kevin Merrell. |
| 07/12/19 | Oakland Athletics sent C Nick Hundley on a rehab assignment to AZL Athletics Gold. |
| 07/11/19 | Oakland Athletics sent RHP Jharel Cotton on a rehab assignment to Las Vegas Aviators. |
| 07/09/19 | Oakland Athletics sent RHP Jharel Cotton on a rehab assignment to Stockton Ports. |
| 07/08/19 | Oakland Athletics signed RHP Jack Weisenburger. |
| 07/08/19 | Oakland Athletics sent LHP Sean Manaea on a rehab assignment to Stockton Ports. |
| 07/06/19 | Oakland Athletics recalled J.B. Wendelken from Las Vegas Aviators. |
| 07/06/19 | Baltimore Orioles claimed RHP Aaron Brooks off waivers from Oakland Athletics. |
| 07/06/19 | Oakland Athletics optioned RHP Paul Blackburn to Las Vegas Aviators. |
| 07/05/19 | Oakland Athletics optioned RHP Tanner Anderson to Las Vegas Aviators. |
| 07/05/19 | Oakland Athletics recalled Paul Blackburn from Las Vegas Aviators. |
| 07/03/19 | Oakland Athletics activated RHP Blake Treinen from the 10-day injured list. |
| 07/03/19 | Oakland Athletics designated RHP Aaron Brooks for assignment. |
| 07/03/19 | 2B Matt McGarry assigned to Oakland Athletics. |
| 07/02/19 | Oakland Athletics signed free agent OF Joseph Rodriguez to a minor league contract. |
| 07/02/19 | Oakland Athletics signed free agent RHP Jesus Silverio to a minor league contract. |
| 07/02/19 | Oakland Athletics transferred RHP Marco Estrada from the 10-day injured list to the 60-day injured list. Lumbar strain. |
| 07/02/19 | Oakland Athletics signed free agent RHP Marco Breindembach to a minor league contract. |
| 07/02/19 | Oakland Athletics signed free agent 2B Erubiel Fuentes to a minor league contract. |
| 07/02/19 | Oakland Athletics signed free agent SS Robert Puason to a minor league contract. |
| 07/02/19 | Oakland Athletics signed free agent RHP Pedro Torrealba to a minor league contract. |
| 07/02/19 | Oakland Athletics signed free agent RHP Yehizon Sanchez to a minor league contract. |
| 07/02/19 | Oakland Athletics signed free agent OF Jasmed Diaz to a minor league contract. |
| 07/02/19 | Oakland Athletics signed free agent C Carlos Franco to a minor league contract. |
| 07/02/19 | Oakland Athletics signed free agent C Jayson Gainza to a minor league contract. |
| 07/02/19 | Oakland Athletics activated C Chris Herrmann from the 60-day injured list. |
| 07/02/19 | Oakland Athletics optioned C Beau Taylor to Las Vegas Aviators. |
| 07/02/19 | Oakland Athletics signed free agent C Luis Marinez to a minor league contract. |
| 07/02/19 | Oakland Athletics signed free agent CF Moises Gallardo to a minor league contract. |
| 07/01/19 | SS Nico Giarratano assigned to Oakland Athletics. |
| 07/01/19 | Oakland Athletics signed 3B T.J. Schofield-Sam. |
| 07/01/19 | Oakland Athletics optioned C Beau Taylor to Las Vegas Aviators. |
| 07/01/19 | Oakland Athletics sent RHP Blake Treinen on a rehab assignment to Las Vegas Aviators. |