| | | Monday, December 17th, 2012 | | Drafted SS Rintaro Tanaka in the 2012 first-year player draft (Round 1, Pick 20, 20th overall pick). | | Drafted CF Marcos Deleón in the 2012 first-year player draft (Round 2, Pick 20, 44th overall pick). | | Drafted SP Sumitomo Noda in the 2012 first-year player draft (Round 3, Pick 20, 68th overall pick). | | Drafted SP Brent Welch in the 2012 first-year player draft (Round 4, Pick 20, 92nd overall pick). | | Drafted CL Jason Johnston in the 2012 first-year player draft (Round 5, Pick 20, 116th overall pick). | | Drafted 3B Francisco López in the 2012 first-year player draft (Round 6, Pick 20, 140th overall pick). | | Drafted SS Adrian Brown in the 2012 first-year player draft (Round 7, Pick 20, 164th overall pick). | | Drafted 1B Kyoichi Hasegawa in the 2012 first-year player draft (Round 8, Pick 20, 188th overall pick). | | Drafted MR Masashige Hayashi in the 2012 first-year player draft (Round 9, Pick 20, 212nd overall pick). | | Drafted CL Kokei Watanabe in the 2012 first-year player draft (Round 10, Pick 20, 236th overall pick). | | Drafted C David Vickerson in the 2012 first-year player draft (Round 11, Pick 20, 260th overall pick). | | Drafted SP Edgar Rodríguez in the 2012 first-year player draft (Round 12, Pick 20, 284th overall pick). |
| Friday, November 23rd, 2012 | | Placed CF Bob Reece on the 40-man roster. | | Placed CF Bob Reece on the active roster. | | Activated CF Bob Reece from the 60-day disabled list. |
| Wednesday, November 21st, 2012 | | 2B José Ortíz received a 1-year contract through automatic renewal worth a total of $510,000. | | MR Rich Barrett received a 1-year contract through automatic renewal worth a total of $510,000. | | MR Micheal Coleman received a 1-year contract through automatic renewal worth a total of $510,000. | | 2B Alonso Núñes received a 1-year contract through automatic renewal worth a total of $510,000. | | SP Christian Clark received a 1-year contract through automatic renewal worth a total of $500,000. | | MR Arturo Sandoval received a 1-year contract through automatic renewal worth a total of $510,000. | | C Phillip Smith received a 1-year contract through automatic renewal worth a total of $510,000. | | RF Victor Bailey received a 1-year contract through automatic renewal worth a total of $510,000. | | CF James Davis received a 1-year contract through automatic renewal worth a total of $510,000. | | MR Chris Mills received a 1-year contract through automatic renewal worth a total of $510,000. | | MR Nick Fox received a 1-year contract through automatic renewal worth a total of $510,000. | | SP Bob Magee received a 1-year contract through automatic renewal worth a total of $500,000. | | SP Dan Rogers received a 1-year contract through automatic renewal worth a total of $500,000. | | CF Dave Lewis received a 1-year contract through automatic renewal worth a total of $500,000. | | CF Steve Sherman becomes a free-agent. | | MR Félix Macías becomes a free-agent. |
| Sunday, November 18th, 2012 | | 1B Vic Jennings received a 1-year contract through arbitration worth a total of $5,027,000. | | SS Erik Bennett received a 1-year contract through arbitration worth a total of $900,000. | | MR Francisco García received a 1-year contract through arbitration worth a total of $750,000. |
| Monday, November 5th, 2012 | | Signed CF Bob Reece to a 3-year contract extension worth a total of $9,820,000. |
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