| | | Sunday, December 30th, 2012 | | Signed free agent SP Tom Green to a 1-year contract worth a total of $900,000. |
| Wednesday, December 26th, 2012 | | Signed free agent SP Dave Nance to a minor league contract. |
| Saturday, December 22nd, 2012 | | Signed Adrien Clément to a minor league contract with a signing bonus of $1,000,000. |
| Monday, December 17th, 2012 | | Promoted C Reese Bowen from Single A Chippewa to Double A Rock River. | | Demoted C Luis León from Double A Rock River to Single A Chippewa. | | Drafted SP Adrien Clément in the 2012 first-year player draft (Round 1, Pick 13, 13th overall pick). | | Drafted RF Chris Weir in the 2012 first-year player draft (Round 2, Pick 13, 37th overall pick). | | Drafted RF Tetsui Jouon in the 2012 first-year player draft (Round 3, Pick 13, 61st overall pick). | | Drafted SS Ichizo Hirose in the 2012 first-year player draft (Round 4, Pick 13, 85th overall pick). | | Drafted 3B Izo Kichikawa in the 2012 first-year player draft (Round 5, Pick 13, 109th overall pick). | | Drafted LF Jean Pierre in the 2012 first-year player draft (Round 6, Pick 13, 133rd overall pick). | | Drafted 3B Shintaro Kichida in the 2012 first-year player draft (Round 7, Pick 13, 157th overall pick). | | Drafted CF Ron Howse in the 2012 first-year player draft (Round 8, Pick 13, 181st overall pick). | | Drafted 2B Ethan Lewin in the 2012 first-year player draft (Round 9, Pick 13, 205th overall pick). | | Drafted CF Kelly Simmons in the 2012 first-year player draft (Round 10, Pick 13, 229th overall pick). | | Drafted LF Nobuhito Koyama in the 2012 first-year player draft (Round 11, Pick 13, 253rd overall pick). | | Drafted C Bob Genge in the 2012 first-year player draft (Round 12, Pick 13, 277th overall pick). | | Released SP Richard Hickey. | | Released C Mike Nance. | | Released MR Yves Guedon. | | Released MR Tommi Karvinen. | | Released MR Sam Williams. | | Released MR Brian McNeal. | | Released MR Manuelo Fajardo. |
| Monday, December 10th, 2012 | | Signed free agent SP Alejandro Cabrera to a 2-year contract worth a total of $2,000,000. |
| Thursday, December 6th, 2012 | | Signed free agent SP Joe Erickson to a 2-year contract worth a total of $1,800,000. |
| Saturday, December 1st, 2012 | | Drafted SP Conor Nodder in the 2012 Rule 5 Draft (Round 1, Pick 13, 13th overall Pick), from the Las Vegas Jokers. |
| Wednesday, November 21st, 2012 | | LF Tom Klein received a 1-year contract through automatic renewal worth a total of $6,000,000. | | MR Dennis Inman received a 1-year contract through automatic renewal worth a total of $510,000. | | CL Ramón Rivera received a 1-year contract through automatic renewal worth a total of $510,000. | | SP Eric Yates received a 1-year contract through automatic renewal worth a total of $510,000. | | SS Francisco Ángel received a 1-year contract through automatic renewal worth a total of $510,000. | | SS José Piña received a 1-year contract through automatic renewal worth a total of $510,000. | | CF Austin McCabe received a 1-year contract through automatic renewal worth a total of $500,000. | | SP Sancho Arteaga received a 1-year contract through automatic renewal worth a total of $500,000. | | 2B Ignacio Villarreal received a 1-year contract through automatic renewal worth a total of $510,000. | | RF John Ross received a 1-year contract through automatic renewal worth a total of $510,000. | | SP Héctor Figueroa received a 1-year contract through automatic renewal worth a total of $510,000. | | MR Ramón García received a 1-year contract through automatic renewal worth a total of $510,000. | | MR Liam McMahon becomes a free-agent. | | LF Steve Williams becomes a free-agent. | | CF Júlio Germán becomes a free-agent. | | 1B Tony Johnson becomes a free-agent. | | Promoted MR Tommi Karvinen from Single A Chippewa to Double A Rock River. | | Promoted 3B Arthur Miller from Single A Chippewa to Double A Rock River. | | Promoted LF Luis Guerrero from Single A Chippewa to Double A Rock River. | | Promoted LF Fred Newton from Single A Chippewa to Double A Rock River. |
| Sunday, November 18th, 2012 | | SP Brian O'Keggan received a 1-year contract through arbitration worth a total of $750,000. |
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