| | | Friday, August 9th, 1912 | | Signed Jack Bentley to a minor league contract with a signing bonus of $500. |
| Wednesday, August 7th, 1912 | | Signed Paul Valentine to a minor league contract with a signing bonus of $200. |
| Sunday, August 4th, 1912 | | Placed CF Jerry Dorsey on the 60-day disabled list. | | Placed C Jack Lapp on the active roster. | | Activated C Jack Lapp from the disabled list. | | Placed CF Jerry Dorsey on the 60-day disabled list. | | Placed C Jack Lapp on the active roster. | | Activated C Jack Lapp from the disabled list. |
| Saturday, June 22nd, 1912 | | Signed Ángel Aranda to a minor league contract with a signing bonus of $380. |
| Tuesday, June 18th, 1912 | | Signed Buck Weaver to a minor league contract with a signing bonus of $1,210. |
| Saturday, June 15th, 1912 | | Drafted SS Buck Weaver in the 1912 first-year player draft (Round 1, Pick 23, 23rd overall pick). | | Drafted RF Billy Southworth in the 1912 first-year player draft (Supplemental Round 1, Pick 10, 35th overall pick). | | Drafted CL Ángel Aranda in the 1912 first-year player draft (Round 2, Pick 24, 61st overall pick). | | Drafted SP Jack Bentley in the 1912 first-year player draft (Round 3, Pick 20, 83rd overall pick). | | Drafted SP Chad Crabb in the 1912 first-year player draft (Round 4, Pick 20, 105th overall pick). | | Drafted SP Paul Valentine in the 1912 first-year player draft (Round 5, Pick 22, 129th overall pick). | | Drafted SP Jorge Ávila in the 1912 first-year player draft (Round 6, Pick 15, 146th overall pick). | | Drafted SP Jake Beers in the 1912 first-year player draft (Round 7, Pick 15, 162nd overall pick). | | Drafted CL Edgardo Ortega in the 1912 first-year player draft (Round 8, Pick 15, 178th overall pick). | | Drafted SP David Hinton in the 1912 first-year player draft (Round 9, Pick 15, 194th overall pick). | | Drafted SP Junnosuke Abe in the 1912 first-year player draft (Round 10, Pick 15, 210th overall pick). | | Drafted MR Pete Schmidt in the 1912 first-year player draft (Round 11, Pick 15, 226th overall pick). | | Drafted MR Joe McManus in the 1912 first-year player draft (Round 12, Pick 15, 242nd overall pick). | | Drafted MR Leonard Bennison in the 1912 first-year player draft (Round 13, Pick 15, 258th overall pick). | | Drafted CL Niculáo Maanico in the 1912 first-year player draft (Round 14, Pick 15, 274th overall pick). | | Drafted MR Ronald Fish in the 1912 first-year player draft (Round 15, Pick 15, 290th overall pick). | | Drafted MR Ken Banks in the 1912 first-year player draft (Round 16, Pick 15, 306th overall pick). | | Drafted MR Maxwell Weatherupp in the 1912 first-year player draft (Round 17, Pick 15, 322nd overall pick). | | Drafted MR Luis Sosa in the 1912 first-year player draft (Round 18, Pick 15, 338th overall pick). | | Drafted RF Doc Cook in the 1912 first-year player draft (Round 19, Pick 15, 354th overall pick). | | Drafted LF Hugh High in the 1912 first-year player draft (Round 20, Pick 15, 370th overall pick). | | Drafted CF Bud Randall in the 1912 first-year player draft (Round 21, Pick 15, 386th overall pick). | | Drafted CF Ernie Walker in the 1912 first-year player draft (Round 22, Pick 15, 402nd overall pick). | | Drafted CF Bill Bryant in the 1912 first-year player draft (Round 23, Pick 15, 418th overall pick). | | Drafted C Red McKee in the 1912 first-year player draft (Round 24, Pick 15, 434th overall pick). | | Drafted 3B Harry Fritz in the 1912 first-year player draft (Round 25, Pick 15, 450th overall pick). |
| Friday, February 9th, 1912 | | Signed hitting coach Juan Ayala to a 5-year, $640 per year contract. |
| Thursday, November 16th, 1911 | | 2B Jim Viox received a 1-year contract through automatic renewal worth a total of $833. | | C Bill Killefer received a 1-year contract through automatic renewal worth a total of $833. | | SP Louis Drucke received a 1-year contract through automatic renewal worth a total of $990. | | SP Con Starkel received a 1-year contract through automatic renewal worth a total of $990. | | 2B Rollie Zeider received a 1-year contract through automatic renewal worth a total of $990. | | LF Fred Payne received a 1-year contract through automatic renewal worth a total of $990. | | LF Jack Graney received a 1-year contract through automatic renewal worth a total of $990. |
| Monday, November 13th, 1911 | | 2B Red Downs received a 1-year contract through arbitration worth a total of $1,476. | | C Jack Lapp received a 1-year contract through arbitration worth a total of $1,666. | | CF Burt Shotton received a 1-year contract through arbitration worth a total of $1,250. | | CF Clyde Milan received a 1-year contract through arbitration worth a total of $4,700. | | SS Art Fletcher received a 1-year contract through arbitration worth a total of $1,292. | | 3B Larry Gardner received a 1-year contract through arbitration worth a total of $1,924. | | LF Red Killefer received a 1-year contract through arbitration worth a total of $1,284. | | 1B Butch Schmidt received a 1-year contract through arbitration worth a total of $1,320. | | 3B Jimmy Austin becomes a free-agent. | | SP Ed Reulbach received a 1-year contract through arbitration worth a total of $1,572. | | SS John Knight becomes a free-agent. | | SP Rube Kroh received a 1-year contract through arbitration worth a total of $1,250. | | SS Buck Herzog received a 1-year contract through arbitration worth a total of $1,250. |
| Monday, October 23rd, 1911 | | MA Ricardo Quintanilla retires. |
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