| | | Saturday, July 6th, 1912 | | Signed Ray Johnson to a minor league contract with a signing bonus of $1,000. |
| Wednesday, July 3rd, 1912 | | Signed 1st round draft pick Nick Cullop for a signing bonus of $2,500 and a 3-year major league contract worth a total of $6,000. | | Signed Sergio Sánchez to a minor league contract with a signing bonus of $2,700. |
| Tuesday, July 2nd, 1912 | | Signed Fred House to a minor league contract with a signing bonus of $190. |
| Saturday, June 15th, 1912 | | Drafted SP Nick Cullop in the 1912 first-year player draft (Round 1, Pick 24, 24th overall pick). | | Drafted SP Ray Johnson in the 1912 first-year player draft (Round 2, Pick 25, 62nd overall pick). | | Drafted MR Tony González in the 1912 first-year player draft (Round 3, Pick 21, 84th overall pick). | | Drafted MR Fred House in the 1912 first-year player draft (Round 4, Pick 22, 107th overall pick). | | Drafted SP Barrett White in the 1912 first-year player draft (Round 5, Pick 19, 126th overall pick). | | Drafted SP Robert Allen in the 1912 first-year player draft (Round 5, Pick 23, 130th overall pick). | | Drafted SP Mitch Odom in the 1912 first-year player draft (Round 6, Pick 16, 147th overall pick). | | Drafted SP Wally Lambright in the 1912 first-year player draft (Round 7, Pick 16, 163rd overall pick). | | Drafted MR Sergio Sánchez in the 1912 first-year player draft (Round 8, Pick 16, 179th overall pick). | | Drafted SP Mark Sharland in the 1912 first-year player draft (Round 9, Pick 16, 195th overall pick). | | Drafted SP Pedro Valentín in the 1912 first-year player draft (Round 10, Pick 16, 211st overall pick). | | Drafted MR Andy Harrington in the 1912 first-year player draft (Round 11, Pick 16, 227th overall pick). | | Drafted MR Allen Flanagan in the 1912 first-year player draft (Round 12, Pick 16, 243rd overall pick). | | Drafted MR Russ Sullivan in the 1912 first-year player draft (Round 13, Pick 16, 259th overall pick). | | Drafted CL Miguel Trujillo in the 1912 first-year player draft (Round 14, Pick 16, 275th overall pick). | | Drafted MR Armando Campos in the 1912 first-year player draft (Round 15, Pick 16, 291st overall pick). | | Drafted MR Luis Caro in the 1912 first-year player draft (Round 16, Pick 16, 307th overall pick). | | Drafted MR Burton Woods in the 1912 first-year player draft (Round 17, Pick 16, 323rd overall pick). | | Drafted CL Albert Lulero in the 1912 first-year player draft (Round 18, Pick 16, 339th overall pick). | | Drafted MR John Elliott in the 1912 first-year player draft (Round 19, Pick 16, 355th overall pick). | | Drafted C Ernie Krueger in the 1912 first-year player draft (Round 20, Pick 16, 371st overall pick). | | Drafted CF Luis Rivera in the 1912 first-year player draft (Round 21, Pick 16, 387th overall pick). | | Drafted 2B Ron Brandt in the 1912 first-year player draft (Round 22, Pick 16, 403rd overall pick). | | Drafted 2B Jorge Morín in the 1912 first-year player draft (Round 23, Pick 16, 419th overall pick). | | Drafted CF Javier Beneviedes in the 1912 first-year player draft (Round 24, Pick 16, 435th overall pick). | | Drafted 2B Martín Salas in the 1912 first-year player draft (Round 25, Pick 16, 451st overall pick). | | Placed DH John McGraw on the 40-man roster. | | Released DH John McGraw. |
| Wednesday, May 8th, 1912 | | Signed 2B Eddie Collins to a 3-year contract extension worth a total of $14,670. |
| Thursday, March 21st, 1912 | | Placed DH John McGraw on the 40-man roster. | | Placed DH John McGraw on the active roster. |
| Wednesday, March 6th, 1912 | | Designated DH John McGraw for assignment. |
| Friday, February 16th, 1912 | | Placed DH John McGraw on the 40-man roster. | | Placed DH John McGraw on the active roster. |
| Wednesday, December 27th, 1911 | | Signed free agent SP Bucky Veil to a 3-year contract worth a total of $15,000. |
| Friday, December 22nd, 1911 | | Signed free agent 3B Jack Hannifin to a 3-year contract worth a total of $6,330. |
| Sunday, December 17th, 1911 | | Signed free agent MR Cy Ferry to a 3-year contract worth a total of $8,070. |
| Monday, November 13th, 1911 | | MR Bert Sincock received a 1-year contract through arbitration worth a total of $1,250. | | LF Art Kruger received a 1-year contract through arbitration worth a total of $2,300. | | 3B Frank Baker received a 1-year contract through arbitration worth a total of $1,250. | | MR Larry Milton received a 1-year contract through arbitration worth a total of $1,250. | | C Jack Bliss received a 1-year contract through arbitration worth a total of $1,250. | | C Ted Easterly received a 1-year contract through arbitration worth a total of $3,400. | | MR Del Mason received a 1-year contract through arbitration worth a total of $1,250. | | MR Connie Walsh received a 1-year contract through arbitration worth a total of $1,250. | | DH Buck Hopkins received a 1-year contract through arbitration worth a total of $7,000. |
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