Athletics Roster & Staff
Transactions
| Date | Transaction |
| 06/29/12 | Oakland Athletics signed free agent LHP Beau Jones to a minor league contract. |
| 06/29/12 | Oakland Athletics optioned Tyson Ross to Sacramento River Cats. |
| 06/29/12 | Oakland Athletics recalled 1B Chris Carter from Sacramento River Cats. |
| 06/26/12 | New York Yankees claimed RHP Danny Farquhar off waivers from Oakland Athletics. |
| 06/25/12 | Oakland Athletics signed OF Robert Martinez. |
| 06/24/12 | Oakland Athletics recalled Evan Scribner from Sacramento River Cats. |
| 06/24/12 | Oakland Athletics placed RHP Brandon McCarthy on the 15-day disabled list retroactive to June 20, 2012. Strained right shoulder. |
| 06/24/12 | Oakland Athletics selected the contract of RHP A.J. Griffin from Sacramento River Cats. |
| 06/24/12 | Oakland Athletics optioned Eric Sogard to Sacramento River Cats. |
| 06/24/12 | Oakland Athletics designated Danny Farquhar for assignment. |
| 06/23/12 | Oakland Athletics placed RF Collin Cowgill on the 15-day disabled list. sprained left ankle |
| 06/23/12 | Oakland Athletics recalled Brandon Hicks from Sacramento River Cats. |
| 06/23/12 | Oakland Athletics recalled Tyson Ross from Sacramento River Cats. |
| 06/23/12 | Oakland Athletics placed RHP Bartolo Colon on the 15-day disabled list retroactive to June 18, 2012. strained right oblique |
| 06/21/12 | Oakland Athletics optioned 3B Josh Donaldson to Sacramento River Cats. |
| 06/21/12 | Oakland Athletics activated LHP Jordan Norberto from the 15-day disabled list. |
| 06/21/12 | Oakland Athletics recalled C Derek Norris from Sacramento River Cats. |
| 06/21/12 | Oakland Athletics optioned Pedro Figueroa to Sacramento River Cats. |
| 06/20/12 | Vincent Voiro assigned to AZL Athletics from Oakland Athletics. |
| 06/20/12 | LF Matthew Hillsinger assigned to AZL Athletics from Oakland Athletics. |
| 06/20/12 | Daniel Robertson assigned to AZL Athletics from Oakland Athletics. |
| 06/20/12 | Matt Olson assigned to AZL Athletics from Oakland Athletics. |
| 06/20/12 | Bruce Maxwell assigned to AZL Athletics from Oakland Athletics. |
| 06/20/12 | Seth Streich assigned to AZL Athletics from Oakland Athletics. |
| 06/19/12 | Oakland Athletics signed SS Melvin Mercedes. |
| 06/19/12 | Oakland Athletics signed SS Daniel Robertson. |
| 06/19/12 | Oakland Athletics signed RHP Derek De Young. |
| 06/19/12 | Oakland Athletics signed 1B Matt Olson. |
| 06/19/12 | Oakland Athletics signed RHP Tyler Johnson. |
| 06/17/12 | Oakland Athletics optioned Tyson Ross to Sacramento River Cats. |
| 06/17/12 | Oakland Athletics recalled Pedro Figueroa from Sacramento River Cats. |
| 06/16/12 | Oakland Athletics optioned Evan Scribner to Sacramento River Cats. |
| 06/16/12 | Oakland Athletics sent 1B Kila Ka'aihue outright to Sacramento River Cats. |
| 06/16/12 | Oakland Athletics optioned Adam Rosales to Sacramento River Cats. |
| 06/16/12 | Oakland Athletics recalled RHP Tyson Ross from Sacramento River Cats. |
| 06/16/12 | Oakland Athletics recalled 3B Eric Sogard from Sacramento River Cats. |
| 06/16/12 | Oakland Athletics signed 1B Max Muncy. |
| 06/16/12 | Oakland Athletics signed RHP Dakota Bacus. |
| 06/16/12 | Oakland Athletics signed OF Ryan Mathews. |
| 06/16/12 | Philip Pohl assigned to Vermont Lake Monsters from Oakland Athletics. |
| 06/16/12 | Tucker Healy assigned to Vermont Lake Monsters from Oakland Athletics. |
| 06/16/12 | Austin House assigned to Vermont Lake Monsters from Oakland Athletics. |
| 06/16/12 | John Wooten assigned to Vermont Lake Monsters from Oakland Athletics. |
| 06/15/12 | Oakland Athletics signed Seth Streich. |
| 06/15/12 | Oakland Athletics signed SS Addison Russell. |
| 06/14/12 | Oakland Athletics signed free agent LHP Ivan Andueza to a minor league contract. |
| 06/13/12 | Oakland Athletics signed 1B John Wooten. |
| 06/13/12 | Oakland Athletics signed SS Chris Wolfe. |
| 06/13/12 | Oakland Athletics signed RHP Lee Sosa. |
| 06/13/12 | Oakland Athletics signed OF Herschel Powell. |
| 06/09/12 | Oakland Athletics claimed RHP Danny Farquhar off waivers from Toronto Blue Jays. |
| 06/09/12 | Oakland Athletics signed OF Matthew Hillsinger. |
| 06/09/12 | Oakland Athletics signed RHP Ryan Dull. |
| 06/09/12 | Oakland Athletics signed RHP Kris Hall. |
| 06/09/12 | Oakland Athletics optioned RHP Danny Farquhar to Sacramento River Cats. |
| 06/09/12 | Oakland Athletics signed C Bruce Maxwell. |
| 06/09/12 | Oakland Athletics transferred RHP Andrew Carignan from the 15-day disabled list to the 60-day disabled list. |
| 06/08/12 | Oakland Athletics signed RHP Kayvon Bahramzadeh. |
| 06/08/12 | Oakland Athletics signed C Philip Pohl. |
| 06/08/12 | Oakland Athletics signed RHP Derek Hansen. |
| 06/08/12 | Oakland Athletics signed RHP Tucker Healy. |
| 06/08/12 | Oakland Athletics signed RHP Austin House. |
| 06/08/12 | Oakland Athletics signed RHP Cody Kurz. |
| 06/08/12 | Oakland Athletics signed RHP Vincent Voiro. |
| 06/08/12 | Oakland Athletics signed CF Brett Vertigan. |
| 06/08/12 | Oakland Athletics signed RHP Stuart Pudenz. |
| 06/08/12 | Oakland Athletics signed RHP Tyler Hollstegge. |
| 06/08/12 | Oakland Athletics signed CF B.J. Boyd. |
| 06/08/12 | Oakland Athletics signed LHP Taylor Massey. |
| 06/08/12 | Oakland Athletics signed C Ryan Gorton. |
| 06/06/12 | Oakland Athletics selected the contract of 1B Brandon Moss from Sacramento River Cats. |
| 06/06/12 | Oakland Athletics designated Kila Ka'aihue for assignment. |
| 06/06/12 | Oakland Athletics placed RHP Andrew Carignan on the 15-day disabled list. Sprained right elbow. |
| 06/06/12 | Oakland Athletics selected the contract of Evan Scribner from Sacramento River Cats. |
| 06/04/12 | Oakland Athletics recalled LHP Sean Doolittle from Sacramento River Cats. |
| 06/04/12 | Oakland Athletics placed LHP Jordan Norberto on the 15-day disabled list retroactive to May 31, 2012. strained left shoulder |
| 06/02/12 | Oakland Athletics optioned Daric Barton to Sacramento River Cats. |
| 06/02/12 | Oakland Athletics activated RHP Brandon McCarthy from the 15-day disabled list. |
| 06/01/12 | Oakland Athletics activated LF Yoenis Cespedes from the 15-day disabled list. |