| | | Tuesday, July 23rd, 1912 | | Signed Harry Harper to a minor league contract with a signing bonus of $1,500. |
| Sunday, July 14th, 1912 | | Placed CF Dutch Zwilling on the 15-day disabled list. | | Placed SP Hi West on the PBA Triple A 15-day disabled list. |
| Thursday, July 4th, 1912 | | Signed Pedro Muñóz to a minor league contract with a signing bonus of $1,220. |
| Wednesday, July 3rd, 1912 | | Signed Jim Bagby to a minor league contract with a signing bonus of $290. |
| Monday, July 1st, 1912 | | Signed Al Mamaux to a minor league contract with a signing bonus of $230. |
| Saturday, June 29th, 1912 | | Signed 1st round draft pick Wally Schang for a signing bonus of $1,457 and a 3-year major league contract worth a total of $4,998. |
| Tuesday, June 25th, 1912 | | Signed Milt Stock to a minor league contract with a signing bonus of $510. |
| Monday, June 24th, 1912 | | Signed Paul Lindholm to a minor league contract with a signing bonus of $180. |
| Sunday, June 16th, 1912 | | Signed free agent C Mike Walker to a minor league contract. | | Signed free agent C Mike Loan to a minor league contract. | | Signed free agent RF Gil Whitehouse to a minor league contract. |
| Saturday, June 15th, 1912 | | Placed 2B Larry Doyle on the 15-day disabled list. | | Placed RF Dave Robertson on the active roster. | | Activated RF Dave Robertson from the disabled list. | | Demoted MR George Hunter to Triple A Orlando. | | Placed SP Farmer Ray on the 40-man roster. | | Placed SP Farmer Ray on the active roster. | | Placed RF Chester Emerson on the PBA Triple A 15-day disabled list. | | Placed C Harry Curtis on the PBA Triple A 15-day disabled list. | | Drafted C Wally Schang in the 1912 first-year player draft (Round 1, Pick 13, 13th overall pick). | | Drafted CF Pedro Muñóz in the 1912 first-year player draft (Supplemental Round 1, Pick 6, 31st overall pick). | | Drafted 3B Milt Stock in the 1912 first-year player draft (Round 2, Pick 12, 49th overall pick). | | Drafted SP Jim Bagby in the 1912 first-year player draft (Round 3, Pick 11, 74th overall pick). | | Drafted MR Al Mamaux in the 1912 first-year player draft (Round 4, Pick 12, 97th overall pick). | | Drafted SP Paul Lindholm in the 1912 first-year player draft (Round 5, Pick 11, 118th overall pick). | | Drafted MR Harry Harper in the 1912 first-year player draft (Round 6, Pick 8, 139th overall pick). | | Drafted SP Warren Godfrey in the 1912 first-year player draft (Round 7, Pick 8, 155th overall pick). | | Drafted MR Chick Smith in the 1912 first-year player draft (Round 8, Pick 8, 171st overall pick). | | Drafted SP Bill Rose in the 1912 first-year player draft (Round 9, Pick 8, 187th overall pick). | | Drafted SP Chris Banks in the 1912 first-year player draft (Round 10, Pick 8, 203rd overall pick). | | Drafted MR Charlie Wheatley in the 1912 first-year player draft (Round 11, Pick 8, 219th overall pick). | | Drafted MR Jim Hanley in the 1912 first-year player draft (Round 12, Pick 8, 235th overall pick). | | Drafted MR John Scheneberg in the 1912 first-year player draft (Round 13, Pick 8, 251st overall pick). | | Drafted MR Wild Bill Luhrsen in the 1912 first-year player draft (Round 14, Pick 8, 267th overall pick). | | Drafted MR Miguel Ledesma in the 1912 first-year player draft (Round 15, Pick 8, 283rd overall pick). | | Drafted MR Alfonso Díaz in the 1912 first-year player draft (Round 16, Pick 8, 299th overall pick). | | Drafted MR Lucas Miller in the 1912 first-year player draft (Round 17, Pick 8, 315th overall pick). | | Drafted MR Dusty Jones in the 1912 first-year player draft (Round 18, Pick 8, 331st overall pick). | | Drafted MR Javier González in the 1912 first-year player draft (Round 19, Pick 8, 347th overall pick). | | Drafted RF Alard Schoon in the 1912 first-year player draft (Round 20, Pick 8, 363rd overall pick). | | Drafted CF Matt Elliott in the 1912 first-year player draft (Round 21, Pick 8, 379th overall pick). | | Drafted RF Ricardo Hernández in the 1912 first-year player draft (Round 22, Pick 8, 395th overall pick). | | Drafted RF Danny Campbell in the 1912 first-year player draft (Round 23, Pick 8, 411st overall pick). | | Drafted CF Wilson Peters in the 1912 first-year player draft (Round 24, Pick 8, 427th overall pick). | | Drafted RF Bob Crowley in the 1912 first-year player draft (Round 25, Pick 8, 443rd overall pick). |
| Wednesday, May 1st, 1912 | | Signed SP Chief Bender to a 2-year contract extension worth a total of $42,718. |
| Wednesday, April 24th, 1912 | | Signed 2B Larry Doyle to a 1-year contract extension worth a total of $15,000. |
| Saturday, April 6th, 1912 | | Signed 1B Alan Storke to a 2-year contract extension worth a total of $5,000. |
| Wednesday, April 3rd, 1912 | | Signed 3B Bill McKechnie to a 3-year contract extension worth a total of $9,000. |
| Thursday, November 16th, 1911 | | MR Jeff Pfeffer received a 1-year contract through automatic renewal worth a total of $833. | | MR George Hunter received a 1-year contract through automatic renewal worth a total of $990. | | MR Louis Leroy received a 1-year contract through automatic renewal worth a total of $833. | | MR Harley Young received a 1-year contract through automatic renewal worth a total of $990. | | RF Amadeo Vázquez received a 1-year contract through automatic renewal worth a total of $833. | | 3B Jimmy Johnston received a 1-year contract through automatic renewal worth a total of $833. | | MR Lou Schettler received a 1-year contract through automatic renewal worth a total of $990. | | 1B Vic Saier received a 1-year contract through automatic renewal worth a total of $833. | | C Tex Erwin received a 1-year contract through automatic renewal worth a total of $833. | | CF Dutch Zwilling received a 1-year contract through automatic renewal worth a total of $990. | | 2B Allie Strobel becomes a free-agent. | | MR Charlie Rhodes becomes a free-agent. | | MR Bugs Raymond becomes a free-agent. | | C Ducky Holmes becomes a free-agent. |
| Tuesday, November 14th, 1911 | | Placed 2B Larry Doyle on the 40-man roster. | | Placed 2B Larry Doyle on the active roster. | | Activated 2B Larry Doyle from the 60-day disabled list. |
| Monday, November 13th, 1911 | | 3B Tillie Shafer received a 1-year contract through arbitration worth a total of $1,316. | | 1B Alan Storke received a 1-year contract through arbitration worth a total of $1,666. | | SP Herm Malloy received a 1-year contract through arbitration worth a total of $1,250. | | 2B Larry Doyle received a 1-year contract through arbitration worth a total of $10,500. | | SP Rube Marquard received a 1-year contract through arbitration worth a total of $1,250. | | SP Hippo Vaughn received a 1-year contract through arbitration worth a total of $2,048. | | 3B Bill McKechnie received a 1-year contract through arbitration worth a total of $2,000. | | C Tommy Clarke received a 1-year contract through arbitration worth a total of $1,250. | | LF Harry Hooper received a 1-year contract through arbitration worth a total of $1,572. | | C Boss Schmidt received a 1-year contract through arbitration worth a total of $1,700. | | CF Joe Birmingham received a 1-year contract through arbitration worth a total of $1,666. |
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