| | | Wednesday, June 26th, 1912 | | Signed Bill Steen to a minor league contract with a signing bonus of $1,420. |
| Friday, June 21st, 1912 | | Signed Al Schulz to a minor league contract with a signing bonus of $420. | | Signed Eric Gardner to a minor league contract with a signing bonus of $190. |
| Monday, June 17th, 1912 | | Signed Ed Donnelly to a minor league contract with a signing bonus of $220. |
| Saturday, June 15th, 1912 | | Drafted SP Bill Steen in the 1912 first-year player draft (Round 2, Pick 10, 47th overall pick). | | Drafted SP Al Schulz in the 1912 first-year player draft (Round 3, Pick 10, 73rd overall pick). | | Drafted SP Ed Donnelly in the 1912 first-year player draft (Round 4, Pick 10, 95th overall pick). | | Drafted SP Eric Gardner in the 1912 first-year player draft (Round 5, Pick 10, 117th overall pick). | | Drafted SP Tom Alexander in the 1912 first-year player draft (Round 6, Pick 7, 138th overall pick). | | Drafted MR Cy Pieh in the 1912 first-year player draft (Round 7, Pick 7, 154th overall pick). | | Drafted SP Jimmy Dixon in the 1912 first-year player draft (Round 8, Pick 7, 170th overall pick). | | Drafted MR Dick Niehaus in the 1912 first-year player draft (Round 9, Pick 7, 186th overall pick). | | Drafted SP Freddy Gómez in the 1912 first-year player draft (Round 10, Pick 7, 202nd overall pick). | | Drafted MR Bob Smith in the 1912 first-year player draft (Round 11, Pick 7, 218th overall pick). | | Drafted MR John Wilson in the 1912 first-year player draft (Round 12, Pick 7, 234th overall pick). | | Drafted CL Chris Woodward in the 1912 first-year player draft (Round 13, Pick 7, 250th overall pick). | | Drafted MR César Flores in the 1912 first-year player draft (Round 14, Pick 7, 266th overall pick). | | Drafted MR Domingo González in the 1912 first-year player draft (Round 15, Pick 7, 282nd overall pick). | | Drafted MR Cremente Cintra in the 1912 first-year player draft (Round 16, Pick 7, 298th overall pick). | | Drafted CL Culley Mitchell in the 1912 first-year player draft (Round 17, Pick 7, 314th overall pick). | | Drafted MR John Starkey in the 1912 first-year player draft (Round 18, Pick 7, 330th overall pick). | | Drafted MR Parker Jackson in the 1912 first-year player draft (Round 19, Pick 7, 346th overall pick). | | Drafted RF Buddy Ryan in the 1912 first-year player draft (Round 20, Pick 7, 362nd overall pick). | | Drafted SS Ernie Johnson in the 1912 first-year player draft (Round 21, Pick 7, 378th overall pick). | | Drafted CF Glenn MacDonald in the 1912 first-year player draft (Round 22, Pick 7, 394th overall pick). | | Drafted CF José Fuentes in the 1912 first-year player draft (Round 23, Pick 7, 410th overall pick). | | Drafted SS Sonny Thomas in the 1912 first-year player draft (Round 24, Pick 7, 426th overall pick). | | Drafted CF Greg Webb in the 1912 first-year player draft (Round 25, Pick 7, 442nd overall pick). |
| Tuesday, February 6th, 1912 | | Signed free agent SP Ham Iburg to a 1-year contract worth a total of $1,370. | | Signed free agent SP Addie Joss to a minor league contract. | | Signed free agent SP Charlie Shields to a 1-year contract worth a total of $1,370. |
| Monday, February 5th, 1912 | | Signed free agent SP War Sanders to a 2-year contract worth a total of $4,820. |
| Tuesday, December 12th, 1911 | | Signed free agent SP Jack Pfiester to a 4-year contract worth a total of $21,300. |
| Thursday, November 16th, 1911 | | SP Charley Hall received a 1-year contract through automatic renewal worth a total of $833. | | C Les Nunamaker received a 1-year contract through automatic renewal worth a total of $833. | | 1B Dave Rowan received a 1-year contract through automatic renewal worth a total of $833. | | CF Hub Northen received a 1-year contract through automatic renewal worth a total of $990. | | CL Marty McHale received a 1-year contract through automatic renewal worth a total of $990. | | RF Doc Miller received a 1-year contract through automatic renewal worth a total of $990. | | SP Ray Tift received a 1-year contract through automatic renewal worth a total of $990. | | SS Roberto Juárez received a 1-year contract through automatic renewal worth a total of $833. | | 2B Bill Kenworthy received a 1-year contract through automatic renewal worth a total of $833. | | LF Joe Riggert received a 1-year contract through automatic renewal worth a total of $990. | | LF Bill Beatty received a 1-year contract through automatic renewal worth a total of $833. | | SP Frank Leary received a 1-year contract through automatic renewal worth a total of $990. | | SP Jack Pfiester becomes a free-agent. | | CL George Crable received a 1-year contract through automatic renewal worth a total of $990. | | 2B Jack Lewis received a 1-year contract through automatic renewal worth a total of $833. | | 2B Bret Wilson received a 1-year contract through automatic renewal worth a total of $833. | | C Babe Towne becomes a free-agent. | | C Jim Byrnes becomes a free-agent. | | 1B Snake Deal becomes a free-agent. |
| Monday, November 13th, 1911 | | CF Vin Campbell received a 1-year contract through arbitration worth a total of $2,400. | | RF Chief Wilson received a 1-year contract through arbitration worth a total of $2,440. | | LF Hy Myers received a 1-year contract through arbitration worth a total of $1,250. | | 3B George Perring received a 1-year contract through arbitration worth a total of $1,250. | | 2B Earle Gardner becomes a free-agent. | | SP Bill McCarthy received a 1-year contract through arbitration worth a total of $1,250. | | C Grover Land received a 1-year contract through arbitration worth a total of $1,250. | | C Oscar Stanage becomes a free-agent. | | SS Steve Yerkes received a 1-year contract through arbitration worth a total of $1,250. | | 1B Ed Konetchy received a 1-year contract through arbitration worth a total of $10,500. | | SP Henry Thielman becomes a free-agent. | | SP Babe Adams received a 1-year contract through arbitration worth a total of $1,869. | | SP Harry Coveleski received a 1-year contract through arbitration worth a total of $1,666. |
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