| | | Friday, July 26th, 1912 | | Signed Nemo Leibold to a minor league contract with a signing bonus of $300. |
| Monday, July 22nd, 1912 | | Signed Adrián Lorenzo to a minor league contract with a signing bonus of $400. |
| Sunday, July 21st, 1912 | | Signed Pedro Diéguez to a minor league contract with a signing bonus of $2,200. |
| Saturday, July 20th, 1912 | | Signed Enrique Rodríguez to a minor league contract with a signing bonus of $1,500. | | Signed Jesse Moss to a minor league contract with a signing bonus of $260. |
| Friday, July 19th, 1912 | | Signed 3B Ed Lennox to a 6-year contract extension worth a total of $72,450. | | Signed SS Roy Hartzell to a 3-year contract extension worth a total of $24,150. |
| Tuesday, July 16th, 1912 | | Signed SP Cy Morgan to a 1-year contract extension worth a total of $1,916. |
| Sunday, July 14th, 1912 | | Placed CF Armando Marsans on the 15-day disabled list. | | Placed LF Max Carey on the active roster. | | Activated LF Max Carey from the disabled list. |
| Thursday, June 27th, 1912 | | Signed Ernie Shore to a minor league contract with a signing bonus of $1,070. |
| Monday, June 24th, 1912 | | Signed Scott Brousseau to a minor league contract with a signing bonus of $2,120. |
| Saturday, June 15th, 1912 | | Placed LF Max Carey on the 15-day disabled list. | | Purchased the contract of CF Armando Marsans from Triple A Merriam Woods. | | Placed SS Roy Hartzell on the 15-day disabled list. | | Purchased the contract of 2B Harry Pattee from Triple A Merriam Woods. | | Drafted CL Scott Brousseau in the 1912 first-year player draft (Round 1, Pick 10, 10th overall pick). | | Drafted MR Enrique Rodríguez in the 1912 first-year player draft (Round 1, Pick 22, 22nd overall pick). | | Drafted SP Ernie Shore in the 1912 first-year player draft (Supplemental Round 1, Pick 3, 28th overall pick). | | Drafted 1B Adrián Lorenzo in the 1912 first-year player draft (Round 2, Pick 22, 59th overall pick). | | Drafted SS Pedro Diéguez in the 1912 first-year player draft (Round 3, Pick 19, 82nd overall pick). | | Drafted 1B Jesse Moss in the 1912 first-year player draft (Round 4, Pick 19, 104th overall pick). | | Drafted CF Nemo Leibold in the 1912 first-year player draft (Round 5, Pick 21, 128th overall pick). | | Drafted RF Pat Palmer in the 1912 first-year player draft (Round 6, Pick 14, 145th overall pick). | | Drafted SP Daniel Gibson in the 1912 first-year player draft (Round 7, Pick 14, 161st overall pick). | | Drafted MR Bernie Duffy in the 1912 first-year player draft (Round 8, Pick 14, 177th overall pick). | | Drafted SP Rusty Dixon in the 1912 first-year player draft (Round 9, Pick 14, 193rd overall pick). | | Drafted SP Bobby Turner in the 1912 first-year player draft (Round 10, Pick 14, 209th overall pick). | | Drafted MR Juan Rivera in the 1912 first-year player draft (Round 11, Pick 14, 225th overall pick). | | Drafted MR Rex Dawson in the 1912 first-year player draft (Round 12, Pick 14, 241st overall pick). | | Drafted MR Chris Starr in the 1912 first-year player draft (Round 13, Pick 14, 257th overall pick). | | Drafted MR Jorge Santos in the 1912 first-year player draft (Round 14, Pick 14, 273rd overall pick). | | Drafted MR Armando Ventura in the 1912 first-year player draft (Round 15, Pick 14, 289th overall pick). | | Drafted MR Justin Sheppard in the 1912 first-year player draft (Round 16, Pick 14, 305th overall pick). | | Drafted MR Seitaro Hirose in the 1912 first-year player draft (Round 17, Pick 14, 321st overall pick). | | Drafted MR Allen Thomas in the 1912 first-year player draft (Round 18, Pick 14, 337th overall pick). | | Drafted LF Spencer Roundtree in the 1912 first-year player draft (Round 19, Pick 14, 353rd overall pick). | | Drafted CF Fred Kommers in the 1912 first-year player draft (Round 20, Pick 14, 369th overall pick). | | Drafted CF Bob Caldwell in the 1912 first-year player draft (Round 21, Pick 14, 385th overall pick). | | Drafted 3B Zinn Beck in the 1912 first-year player draft (Round 22, Pick 14, 401st overall pick). | | Drafted SS Sozui Nishiyama in the 1912 first-year player draft (Round 23, Pick 14, 417th overall pick). | | Drafted 3B Ray Bates in the 1912 first-year player draft (Round 24, Pick 14, 433rd overall pick). | | Drafted C Sam Agnew in the 1912 first-year player draft (Round 25, Pick 14, 449th overall pick). |
| Tuesday, February 6th, 1912 | | Signed free agent LF George Stone to a 1-year contract worth a total of $2,270. | | Signed free agent CL Bill Burns to a 1-year contract worth a total of $1,420. |
| Monday, January 1st, 1912 | | Placed SP Ernie Ross on the 40-man roster. | | Placed SP Ernie Ross on the active roster. | | Activated SP Ernie Ross from the 60-day disabled list. |
| Thursday, November 16th, 1911 | | SP War Sanders becomes a free-agent. | | 2B Lee Magee received a 1-year contract through automatic renewal worth a total of $990. | | SS Joe Cassidy received a 1-year contract through automatic renewal worth a total of $833. | | LF Max Carey received a 1-year contract through automatic renewal worth a total of $990. | | C Bill Ludwig received a 1-year contract through automatic renewal worth a total of $990. | | CL Chet Carmichael received a 1-year contract through automatic renewal worth a total of $990. | | 1B Newt Hunter received a 1-year contract through automatic renewal worth a total of $990. | | CF Armando Marsans received a 1-year contract through automatic renewal worth a total of $990. | | C Matty Fitzgerald becomes a free-agent. | | RF Ed Cermak becomes a free-agent. |
| Monday, November 13th, 1911 | | RF Beals Becker received a 1-year contract through arbitration worth a total of $2,000. | | SP Cy Morgan received a 1-year contract through arbitration worth a total of $1,666. | | 1B Art Griggs received a 1-year contract through arbitration worth a total of $1,250. | | SP Doc Crandall received a 1-year contract through arbitration worth a total of $1,250. | | SP Sam Frock received a 1-year contract through arbitration worth a total of $1,250. | | SP Bill Essick received a 1-year contract through arbitration worth a total of $1,666. | | C Art Wilson received a 1-year contract through arbitration worth a total of $3,500. | | SS Roy Hartzell received a 1-year contract through arbitration worth a total of $7,000. | | SP Ray Collins received a 1-year contract through arbitration worth a total of $3,000. | | SP Fred Beebe received a 1-year contract through arbitration worth a total of $1,529. | | 3B Ed Lennox received a 1-year contract through arbitration worth a total of $10,500. |
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