| | | Tuesday, July 30th, 1912 | | Signed Jon Cates to a minor league contract with a signing bonus of $200. |
| Friday, July 19th, 1912 | | Signed Dwight Stone to a minor league contract with a signing bonus of $730. |
| Tuesday, July 16th, 1912 | | Signed Jeffery Williams to a minor league contract with a signing bonus of $7,630. |
| Tuesday, June 25th, 1912 | | Signed Iván Castillo to a minor league contract with a signing bonus of $220. |
| Saturday, June 15th, 1912 | | Placed SP Hooks Wiltse on irrevocable waivers. |
| Saturday, May 25th, 1912 | | Signed bench coach Danny King to a 5-year, $1,740 per year contract. | | Signed manager António González to a 5-year, $520 per year contract. |
| Monday, March 11th, 1912 | | Signed free agent SS Bobby Wallace to a 1-year contract worth a total of $1,030. | | Signed free agent RF Johnny Lush to a 1-year contract worth a total of $1,320. | | Signed free agent MR Jim Pastorius to a 2-year contract worth a total of $1,760. |
| Wednesday, February 21st, 1912 | | Placed CF Solly Hofman on the active roster. | | Placed RF Bud Sharpe on the active roster. |
| Tuesday, February 6th, 1912 | | Signed free agent CF Solly Hofman to a 2-year contract worth a total of $3,700. | | Signed free agent RF Bud Sharpe to a 3-year contract worth a total of $4,200. |
| Thursday, November 16th, 1911 | | SP Fred Smith received a 1-year contract through automatic renewal worth a total of $833. | | RF Tex McDonald received a 1-year contract through automatic renewal worth a total of $833. | | CL Carl Spongberg received a 1-year contract through automatic renewal worth a total of $833. | | MR Judge Nagle received a 1-year contract through automatic renewal worth a total of $833. | | SP Joe Benz received a 1-year contract through automatic renewal worth a total of $833. | | SP Ray Keating received a 1-year contract through automatic renewal worth a total of $833. | | C Israel Torres received a 1-year contract through automatic renewal worth a total of $833. | | C Yoritomo Kamuta received a 1-year contract through automatic renewal worth a total of $833. | | 3B Heinie Groh received a 1-year contract through automatic renewal worth a total of $833. | | SS Ray Robbins received a 1-year contract through automatic renewal worth a total of $833. | | SP Bill Chappelle received a 1-year contract through automatic renewal worth a total of $833. | | LF George Stone becomes a free-agent. | | SP Ray Caldwell received a 1-year contract through automatic renewal worth a total of $833. | | 1B Bill Bradley becomes a free-agent. | | MR Alex Malloy received a 1-year contract through automatic renewal worth a total of $833. | | 3B Tommy Leach becomes a free-agent. |
| Monday, November 13th, 1911 | | SS Tony Smith received a 1-year contract through arbitration worth a total of $1,250. | | 3B Mike Mowrey becomes a free-agent. | | CF Al Shaw received a 1-year contract through arbitration worth a total of $2,195. | | SP Hooks Wiltse received a 1-year contract through arbitration worth a total of $1,250. | | CL Bill Burns becomes a free-agent. | | SP Ed Barry received a 1-year contract through arbitration worth a total of $1,250. | | 1B Fred Luderus received a 1-year contract through arbitration worth a total of $1,350. | | MR Steve Melter received a 1-year contract through arbitration worth a total of $1,250. | | 1B Dick Hoblitzel received a 1-year contract through arbitration worth a total of $1,700. |
| Monday, October 23rd, 1911 | | Manager Bill Cox leaves the team, his contract was not renewed. | | Bench Coach Fielder Jones leaves the team, his contract was not renewed. |
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