| | | 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. |
| Tuesday, March 19th, 1912 | | Placed SS John Knight on the active roster. | | Placed RF Doc Gessler on the active roster. |
| 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. |
| 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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