| Date | Player | Position | Transaction |
|---|---|---|---|
| May 18 | Daric Barton | 1B | Designated for Assignment by Oakland |
| May 18 | Chris Young | CF/LF/RF | Recalled From Minors Rehab by Oakland |
| May 17 | Chris Resop | RP | Designated for Assignment by Oakland |
| May 17 | Hideki Okajima | RP | Purchased From Minors by Oakland |
| May 16 | Chris Young | CF/LF/RF | Sent to Minors for Rehabilitation by Oakland |
| May 14 | Michael Taylor | RF/LF | Sent to Minors by Oakland |
| May 10 | Evan Scribner | RP | Sent to Minors by Oakland |
| May 10 | Jesse Chavez | RP | Called Up from Minors by Oakland |
| May 10 | Jordan Norberto | RP | Cleared Waivers and Became a Free Agent by Oakland |
| May 10 | Brett Anderson | SP | Sent to Minors for Rehabilitation by Oakland |
| May 8 | Jordan Norberto | RP | Released by Oakland |
| May 8 | Daric Barton | 1B | Purchased From Minors by Oakland |
| May 4 | Michael Taylor | RF/LF | Called Up from Minors by Oakland |
| May 3 | Hiroyuki Nakajima | SS | Sent to Minors for Rehabilitation by Oakland |
| May 1 | Daniel Straily | SP | Called Up from Minors by Oakland |
| May 1 | Luke Montz | C/1B | Purchased From Minors by Oakland |