| | | Monday, August 5th, 1912 | | Signed Vicente Nuez to a minor league contract with a signing bonus of $750. |
| Wednesday, July 31st, 1912 | | Signed Ray Powell to a minor league contract with a signing bonus of $590. |
| Wednesday, June 19th, 1912 | | Signed Fritz Maisel to a minor league contract with a signing bonus of $660. |
| Tuesday, June 18th, 1912 | | Signed Ray Chapman to a minor league contract with a signing bonus of $3,860. | | Signed Al Wickland to a minor league contract with a signing bonus of $1,300. |
| Saturday, June 15th, 1912 | | Placed C José López on the 40-man roster. | | Purchased the contract of C José López from Double A Kansas City. | | Placed 3B Howard Palmer on the 40-man roster. | | Purchased the contract of 3B Howard Palmer from Double A Kansas City. | | Drafted SS Ray Chapman in the 1912 first-year player draft (Round 1, Pick 3, 3rd overall pick). | | Drafted RF Al Wickland in the 1912 first-year player draft (Round 1, Pick 19, 19th overall pick). | | Drafted 3B Fritz Maisel in the 1912 first-year player draft (Round 2, Pick 3, 40th overall pick). | | Drafted 2B Vicente Nuez in the 1912 first-year player draft (Round 2, Pick 11, 48th overall pick). | | Drafted CF Ray Powell in the 1912 first-year player draft (Round 2, Pick 20, 57th overall pick). | | Drafted C Júlio Rodríguez in the 1912 first-year player draft (Round 3, Pick 2, 65th overall pick). | | Drafted 2B George Cutshaw in the 1912 first-year player draft (Round 3, Pick 6, 69th overall pick). | | Drafted LF Ken Powell in the 1912 first-year player draft (Round 3, Pick 14, 77th overall pick). | | Drafted C Ebbe Terwey in the 1912 first-year player draft (Round 4, Pick 3, 88th overall pick). | | Drafted MR Carl Zamloch in the 1912 first-year player draft (Round 4, Pick 13, 98th overall pick). | | Drafted SP Jim Shaw in the 1912 first-year player draft (Round 5, Pick 3, 110th overall pick). | | Drafted SP Alex Roberts in the 1912 first-year player draft (Round 5, Pick 14, 121st overall pick). | | Drafted MR Zip Zabel in the 1912 first-year player draft (Round 6, Pick 2, 133rd overall pick). | | Drafted SP Donovan Hillier in the 1912 first-year player draft (Round 7, Pick 2, 149th overall pick). | | Drafted SP Conner Tomlinson in the 1912 first-year player draft (Round 8, Pick 2, 165th overall pick). | | Drafted SP Artie DeLoach in the 1912 first-year player draft (Round 9, Pick 2, 181st overall pick). | | Drafted MR Charlie Boardman in the 1912 first-year player draft (Round 10, Pick 2, 197th overall pick). | | Drafted SP Matsuo Sato in the 1912 first-year player draft (Round 11, Pick 2, 213rd overall pick). | | Drafted MR Dave Morey in the 1912 first-year player draft (Round 12, Pick 2, 229th overall pick). | | Drafted CL Alexandre Gauthier in the 1912 first-year player draft (Round 13, Pick 2, 245th overall pick). | | Drafted MR Ramón Valentín in the 1912 first-year player draft (Round 14, Pick 2, 261st overall pick). | | Drafted MR Kwang-ho Yi in the 1912 first-year player draft (Round 15, Pick 2, 277th overall pick). | | Drafted CL Enrico García in the 1912 first-year player draft (Round 16, Pick 2, 293rd overall pick). | | Drafted MR Jesús Ventura in the 1912 first-year player draft (Round 17, Pick 2, 309th overall pick). | | Drafted MR Otis Hart in the 1912 first-year player draft (Round 18, Pick 2, 325th overall pick). | | Drafted MR Eugene Milton in the 1912 first-year player draft (Round 19, Pick 2, 341st overall pick). | | Drafted RF Tommy Griffith in the 1912 first-year player draft (Round 20, Pick 2, 357th overall pick). | | Drafted C Lew McCarty in the 1912 first-year player draft (Round 21, Pick 2, 373rd overall pick). | | Drafted 2B José Reyes in the 1912 first-year player draft (Round 22, Pick 2, 389th overall pick). | | Drafted C Frank Gibson in the 1912 first-year player draft (Round 23, Pick 2, 405th overall pick). | | Drafted 3B Brandon Best in the 1912 first-year player draft (Round 24, Pick 2, 421st overall pick). | | Drafted SS J.J. Garrett in the 1912 first-year player draft (Round 25, Pick 2, 437th overall pick). |
| Saturday, April 27th, 1912 | | Signed free agent 1B Shawn Overby to a minor league contract. |
| Saturday, April 20th, 1912 | | Signed team doctor Ward Reece to a 4-year, $900 per year contract. |
| Friday, April 19th, 1912 | | Placed RF David Serrano on the 15-day disabled list. |
| Wednesday, March 6th, 1912 | | Placed SS Leo Meyer on the 40-man roster. | | Placed SS Leo Meyer on the active roster. |
| Tuesday, February 20th, 1912 | | Signed free agent SS Leo Meyer to a 2-year contract worth a total of $2,420. |
| Sunday, February 18th, 1912 | | Signed manager Cory Foster to a 5-year, $1,740 per year contract. |
| Thursday, November 16th, 1911 | | SP Tom Walker becomes a free-agent. | | SP O.F. Baldwin received a 1-year contract through automatic renewal worth a total of $833. | | SP Vean Gregg received a 1-year contract through automatic renewal worth a total of $833. | | RF David Serrano received a 1-year contract through automatic renewal worth a total of $833. | | MR Dick Rudolph received a 1-year contract through automatic renewal worth a total of $833. | | MR Jerry Upp received a 1-year contract through automatic renewal worth a total of $833. | | C Allen Reeves received a 1-year contract through automatic renewal worth a total of $833. | | CF Solly Hofman becomes a free-agent. | | SP Wish Egan becomes a free-agent. | | RF Jimmy Sebring becomes a free-agent. | | SP Bill Dinneen becomes a free-agent. | | RF Doc Gessler becomes a free-agent. | | RF Bailey Vandeusen received a 1-year contract through automatic renewal worth a total of $833. | | MR Bill Cristall becomes a free-agent. |
| Monday, November 13th, 1911 | | SP Joe Wood received a 1-year contract through arbitration worth a total of $1,250. | | CL Fred Anderson received a 1-year contract through arbitration worth a total of $1,250. | | C Chief Meyers received a 1-year contract through arbitration worth a total of $1,250. | | 2B Bobby Vaughn received a 1-year contract through arbitration worth a total of $1,703. | | SP Harry Hardy received a 1-year contract through arbitration worth a total of $1,666. | | LF Zack Wheat received a 1-year contract through arbitration worth a total of $3,400. | | SP Frosty Thomas received a 1-year contract through arbitration worth a total of $1,250. |
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