| | | 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. |
| Wednesday, February 21st, 1912 | | Placed CL Bill Burns on the active roster. | | Placed LF George Stone on the active roster. |
| 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 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. |
| 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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