| | | Thursday, August 8th, 1912 | | Signed Harry Moran to a minor league contract with a signing bonus of $310. |
| Tuesday, August 6th, 1912 | | Signed Joe Boehling to a minor league contract with a signing bonus of $2,250. |
| Monday, August 5th, 1912 | | Signed Reb Russell to a minor league contract with a signing bonus of $2,130. | | Signed Raleigh Aitchison to a minor league contract with a signing bonus of $1,440. |
| Sunday, August 4th, 1912 | | Signed Earl Moseley to a minor league contract with a signing bonus of $6,470. |
| Saturday, August 3rd, 1912 | | Signed Dutch Leonard to a minor league contract with a signing bonus of $3,000. |
| Thursday, August 1st, 1912 | | Signed Bill Doak to a minor league contract with a signing bonus of $2,070. | | Signed Rube Foster to a minor league contract with a signing bonus of $1,120. | | Signed Maury Kent to a minor league contract with a signing bonus of $230. |
| Wednesday, July 31st, 1912 | | Signed Jim Shaw to a minor league contract with a signing bonus of $1,720. | | Signed Matthew May to a minor league contract with a signing bonus of $220. |
| Tuesday, July 30th, 1912 | | Signed Edd Roush to a minor league contract with a signing bonus of $4,371. | | Signed Jack Fournier to a minor league contract with a signing bonus of $6,091. |
| Monday, July 29th, 1912 | | Signed Chief Johnson to a minor league contract with a signing bonus of $1,830. | | Signed Win Noyes to a minor league contract with a signing bonus of $220. |
| Saturday, June 15th, 1912 | | Drafted CF Edd Roush in the 1912 first-year player draft (Round 1, Pick 1, 1st overall pick). | | Drafted 1B Jack Fournier in the 1912 first-year player draft (Round 1, Pick 2, 2nd overall pick). | | Drafted SP Earl Moseley in the 1912 first-year player draft (Round 1, Pick 11, 11th overall pick). | | Drafted SP Chief Johnson in the 1912 first-year player draft (Supplemental Round 1, Pick 5, 30th overall pick). | | Drafted SP Dutch Leonard in the 1912 first-year player draft (Supplemental Round 1, Pick 7, 32nd overall pick). | | Drafted SP Bill Doak in the 1912 first-year player draft (Supplemental Round 1, Pick 9, 34th overall pick). | | Drafted SP Jim Shaw in the 1912 first-year player draft (Round 2, Pick 1, 38th overall pick). | | Drafted SP Reb Russell in the 1912 first-year player draft (Round 2, Pick 2, 39th overall pick). | | Drafted SP Joe Boehling in the 1912 first-year player draft (Round 2, Pick 9, 46th overall pick). | | Drafted SP Raleigh Aitchison in the 1912 first-year player draft (Round 2, Pick 23, 60th overall pick). | | Drafted SP Rube Foster in the 1912 first-year player draft (Round 3, Pick 1, 64th overall pick). | | Drafted SP Harry Moran in the 1912 first-year player draft (Round 4, Pick 1, 86th overall pick). | | Drafted SP Maury Kent in the 1912 first-year player draft (Round 4, Pick 2, 87th overall pick). | | Drafted MR Win Noyes in the 1912 first-year player draft (Round 5, Pick 1, 108th overall pick). | | Drafted SP Matthew May in the 1912 first-year player draft (Round 5, Pick 2, 109th overall pick). | | Drafted SP Brad Thomas in the 1912 first-year player draft (Round 6, Pick 1, 132nd overall pick). | | Drafted MR John Taff in the 1912 first-year player draft (Round 7, Pick 1, 148th overall pick). | | Drafted SP Gil Scott in the 1912 first-year player draft (Round 8, Pick 1, 164th overall pick). | | Drafted MR Bill Lathrop in the 1912 first-year player draft (Round 9, Pick 1, 180th overall pick). | | Drafted SP Alfredo Calderón in the 1912 first-year player draft (Round 10, Pick 1, 196th overall pick). | | Drafted SP Lyle Ross in the 1912 first-year player draft (Round 11, Pick 1, 212nd overall pick). | | Drafted MR Jack Powell in the 1912 first-year player draft (Round 12, Pick 1, 228th overall pick). | | Drafted MR Erwin Renfer in the 1912 first-year player draft (Round 13, Pick 1, 244th overall pick). | | Drafted MR Ray Hartranft in the 1912 first-year player draft (Round 14, Pick 1, 260th overall pick). | | Drafted MR Dave Wilson in the 1912 first-year player draft (Round 15, Pick 1, 276th overall pick). | | Drafted MR Albert Chesry in the 1912 first-year player draft (Round 16, Pick 1, 292nd overall pick). | | Drafted MR John Richardson in the 1912 first-year player draft (Round 17, Pick 1, 308th overall pick). | | Drafted MR Bill Walton in the 1912 first-year player draft (Round 18, Pick 1, 324th overall pick). | | Drafted MR Jorge López in the 1912 first-year player draft (Round 19, Pick 1, 340th overall pick). | | Drafted SS Cecil Kinsley in the 1912 first-year player draft (Round 20, Pick 1, 356th overall pick). | | Drafted C Cole Craig in the 1912 first-year player draft (Round 21, Pick 1, 372nd overall pick). | | Drafted C Jim Grant in the 1912 first-year player draft (Round 22, Pick 1, 388th overall pick). | | Drafted C Steve O'Neill in the 1912 first-year player draft (Round 23, Pick 1, 404th overall pick). | | Drafted RF Sergio Ríos in the 1912 first-year player draft (Round 24, Pick 1, 420th overall pick). | | Drafted RF Pedro González in the 1912 first-year player draft (Round 25, Pick 1, 436th overall pick). |
| Wednesday, March 6th, 1912 | | Signed free agent SS John Knight to a 1-year contract worth a total of $1,360. |
| Tuesday, March 5th, 1912 | | Signed manager Jimmy McAleer to a 5-year, $1,790 per year contract. |
| Monday, March 4th, 1912 | | Signed free agent RF Doc Gessler to a 1-year contract worth a total of $2,370. |
| Saturday, March 2nd, 1912 | | Signed team doctor Gonzalo Lugo to a 3-year, $990 per year contract. | | Signed pitching coach Jesús Alvarado to a 5-year, $800 per year contract. |
| Thursday, November 16th, 1911 | | SP Orval Overall becomes a free-agent. | | SP Oscar Graham received a 1-year contract through automatic renewal worth a total of $833. | | SP Dixie Walker received a 1-year contract through automatic renewal worth a total of $833. | | SP Ernie Baker received a 1-year contract through automatic renewal worth a total of $833. | | SP Jack Doscher received a 1-year contract through automatic renewal worth a total of $833. | | RF Jason Knight received a 1-year contract through automatic renewal worth a total of $833. | | CF Shawn Brooks received a 1-year contract through automatic renewal worth a total of $833. | | C António Medina received a 1-year contract through automatic renewal worth a total of $833. | | C Ernie Herring received a 1-year contract through automatic renewal worth a total of $833. | | 1B Júlio García received a 1-year contract through automatic renewal worth a total of $833. | | SP Charlie Shields becomes a free-agent. | | 1B Jesús Contreras received a 1-year contract through automatic renewal worth a total of $833. | | SS Oscar Westerberg received a 1-year contract through automatic renewal worth a total of $833. | | 3B Joe Craig received a 1-year contract through automatic renewal worth a total of $833. | | LF Joe Burns received a 1-year contract through automatic renewal worth a total of $833. | | 2B Marcos Difebo received a 1-year contract through automatic renewal worth a total of $833. | | RF Jorge Quiñones received a 1-year contract through automatic renewal worth a total of $833. | | MR Bert Maxwell becomes a free-agent. |
| Monday, November 13th, 1911 | | SP Tom Barry received a 1-year contract through arbitration worth a total of $1,250. | | RF Bud Sharpe becomes a free-agent. | | MR Wilbur Good received a 1-year contract through arbitration worth a total of $1,250. | | MR Henry Mathewson received a 1-year contract through arbitration worth a total of $1,250. | | CF Fred Osborn received a 1-year contract through arbitration worth a total of $3,800. | | 2B Harry Niles becomes a free-agent. | | 3B Fred Raymer becomes a free-agent. | | LF Birdie Cree received a 1-year contract through arbitration worth a total of $3,300. |
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