| | | 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. | | Drafted RF Jeffery Williams in the 1912 first-year player draft (Round 1, Pick 4, 4th overall pick). | | Drafted SP Bill James in the 1912 first-year player draft (Round 2, Pick 4, 41st overall pick). | | Drafted SP Dwight Stone in the 1912 first-year player draft (Round 3, Pick 3, 66th overall pick). | | Drafted LF Iván Castillo in the 1912 first-year player draft (Round 4, Pick 5, 90th overall pick). | | Drafted SP Jon Cates in the 1912 first-year player draft (Round 5, Pick 5, 112nd overall pick). | | Drafted SP Alec Foster in the 1912 first-year player draft (Round 6, Pick 3, 134th overall pick). | | Drafted SP Alberto Leal in the 1912 first-year player draft (Round 7, Pick 3, 150th overall pick). | | Drafted SP Pavel van Aalst in the 1912 first-year player draft (Round 8, Pick 3, 166th overall pick). | | Drafted SP Jorge Colón in the 1912 first-year player draft (Round 9, Pick 3, 182nd overall pick). | | Drafted SP Juan Carraso in the 1912 first-year player draft (Round 10, Pick 3, 198th overall pick). | | Drafted MR Harry Hedgpeth in the 1912 first-year player draft (Round 11, Pick 3, 214th overall pick). | | Drafted MR Bill Hopper in the 1912 first-year player draft (Round 12, Pick 3, 230th overall pick). | | Drafted MR Lefty Lorenzen in the 1912 first-year player draft (Round 13, Pick 3, 246th overall pick). | | Drafted MR Paul Maloy in the 1912 first-year player draft (Round 14, Pick 3, 262nd overall pick). | | Drafted MR Cole Bannatyne in the 1912 first-year player draft (Round 15, Pick 3, 278th overall pick). | | Drafted MR Jorge Silva in the 1912 first-year player draft (Round 16, Pick 3, 294th overall pick). | | Drafted MR José Antúnez in the 1912 first-year player draft (Round 17, Pick 3, 310th overall pick). | | Drafted MR Júlio Murga in the 1912 first-year player draft (Round 18, Pick 3, 326th overall pick). | | Drafted MR Austin Hall in the 1912 first-year player draft (Round 19, Pick 3, 342nd overall pick). | | Drafted C Craig Morris in the 1912 first-year player draft (Round 20, Pick 3, 358th overall pick). | | Drafted SS George Barrett in the 1912 first-year player draft (Round 21, Pick 3, 374th overall pick). | | Drafted SS Wayne Evans in the 1912 first-year player draft (Round 22, Pick 3, 390th overall pick). | | Drafted SS Juan Ruíz in the 1912 first-year player draft (Round 23, Pick 3, 406th overall pick). | | Drafted C Jaime Ortíz in the 1912 first-year player draft (Round 24, Pick 3, 422nd overall pick). | | Drafted C Dave Lawson in the 1912 first-year player draft (Round 25, Pick 3, 438th overall pick). |
| 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. |
| 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. | | SP Vive Lindaman becomes a free-agent. | | MR Ed Karger becomes a free-agent. | | Promoted SP Felipe López from Double A Stockton to Triple A Madison. | | Promoted C Hisham Mapute from Double A Stockton to Triple A Madison. |
| 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. | | SS Phil Lewis becomes a free-agent. | | LF Tommy Madden becomes a free-agent. |
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