| | | Monday, December 17th, 2012 | | Drafted CF Ken Forryan in the 2012 first-year player draft (Round 1, Pick 3, 3rd overall pick). | | Drafted SP Roger Marshall in the 2012 first-year player draft (Round 2, Pick 3, 27th overall pick). | | Drafted SP Hiroaki Ine in the 2012 first-year player draft (Round 3, Pick 3, 51st overall pick). | | Drafted SP Reginald Thompson in the 2012 first-year player draft (Round 4, Pick 3, 75th overall pick). | | Drafted SP David Powell in the 2012 first-year player draft (Round 5, Pick 3, 99th overall pick). | | Drafted SP Steve Walker in the 2012 first-year player draft (Round 6, Pick 3, 123rd overall pick). | | Drafted CL Mark Boyar in the 2012 first-year player draft (Round 7, Pick 3, 147th overall pick). | | Drafted RF Otojiro Yamamoto in the 2012 first-year player draft (Round 8, Pick 3, 171st overall pick). | | Drafted RF Murai Ito in the 2012 first-year player draft (Round 9, Pick 3, 195th overall pick). | | Drafted 2B Dan Harris in the 2012 first-year player draft (Round 10, Pick 3, 219th overall pick). | | Drafted LF Shintaro Rin in the 2012 first-year player draft (Round 11, Pick 3, 243rd overall pick). | | Drafted SS Hiroya Aoki in the 2012 first-year player draft (Round 12, Pick 3, 267th overall pick). |
| Tuesday, December 11th, 2012 | | RF Mike Murtagh was designated for assignment and placed on waivers. | | SS Edward Thompson was designated for assignment and placed on waivers. | | SP Tom MacDonald was designated for assignment and placed on waivers. |
| Tuesday, December 4th, 2012 | | Signed free agent SP Al-Ghawrî Polatkan to a minor league contract. |
| Wednesday, November 21st, 2012 | | SP Sergio Ramírez received a 1-year contract through automatic renewal worth a total of $510,000. | | LF Stephen Jackson received a 1-year contract through automatic renewal worth a total of $510,000. | | SP Jeremy Rogers received a 1-year contract through automatic renewal worth a total of $510,000. | | MR Glen Slaughter received a 1-year contract through automatic renewal worth a total of $510,000. | | MR Mark Thompson received a 1-year contract through automatic renewal worth a total of $510,000. | | SP Mike Joyce received a 1-year contract through automatic renewal worth a total of $510,000. | | 1B Fernando Guzmán received a 1-year contract through automatic renewal worth a total of $510,000. | | SP Cecil Gibbons received a 1-year contract through automatic renewal worth a total of $510,000. | | C Jayson O'Neill received a 1-year contract through automatic renewal worth a total of $510,000. | | SS Joe Frost received a 1-year contract through automatic renewal worth a total of $1,500,000. | | MR Joseph Williams received a 1-year contract through automatic renewal worth a total of $510,000. | | RF Mark Buchanan received a 1-year contract through automatic renewal worth a total of $500,000. | | SS Michael Green received a 1-year contract through automatic renewal worth a total of $510,000. | | SP Dave Nicholson received a 1-year contract through automatic renewal worth a total of $510,000. | | SP Johnny Ratzlaff received a 1-year contract through automatic renewal worth a total of $510,000. | | SP Aaron Nelson received a 1-year contract through automatic renewal worth a total of $510,000. | | SP Tom Tart becomes a free-agent. | | Placed SS Edward Thompson on the 40-man roster. |
| Sunday, November 18th, 2012 | | SP Víctor Enríquez received a 1-year contract through arbitration worth a total of $900,000. |
| Wednesday, November 7th, 2012 | | Signed 1B Mark Larson to a 3-year contract extension worth a total of $2,300,000. |
| Tuesday, November 6th, 2012 | | Signed SP Ed Bell to a 3-year contract extension worth a total of $17,450,000. |
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