| | | Thursday, September 24th, 2015 | | Signed CF Wilfred Collins to a 5-year contract extension worth a total of $70,600,000. |
| Wednesday, September 23rd, 2015 | | Placed 1B Jeff Williams on the active roster. | | Activated 1B Jeff Williams from the 60-day disabled list. |
| Tuesday, August 4th, 2015 | | Signed MR Torazo Takahashi to a 2-year contract extension worth a total of $7,820,000. |
| Saturday, August 1st, 2015 | | Placed CF Carlos Sánchez on the 15-day disabled list. |
| Thursday, July 30th, 2015 | | Signed SP Allen Lowe to a 2-year contract extension worth a total of $4,400,000. |
| Thursday, July 2nd, 2015 | | Signed Ollie Theobald to a minor league contract with a signing bonus of $1,800,000. | | Signed Joseph Johnson to a minor league contract with a signing bonus of $190,000. |
| Tuesday, June 23rd, 2015 | | Signed Carl Kelley to a minor league contract with a signing bonus of $150,000. |
| Monday, June 22nd, 2015 | | Signed Caleb Smith to a minor league contract with a signing bonus of $2,690,000. |
| Sunday, June 21st, 2015 | | Signed Mike Gilmore to a minor league contract with a signing bonus of $5,450,000. |
| Monday, February 2nd, 2015 | | Placed RF Carlos Sánchez on the active roster. |
| Saturday, January 31st, 2015 | | Signed free agent RF Carlos Sánchez to a 2-year contract worth a total of $6,360,000. |
| Monday, December 29th, 2014 | | Placed LF Ed Jones on the active roster. |
| Tuesday, December 23rd, 2014 | | Signed free agent LF Ed Jones to a 1-year contract worth a total of $1,330,000. |
| Monday, December 8th, 2014 | | Placed C Caden Knowles on the active roster. |
| Saturday, December 6th, 2014 | | Signed free agent C Caden Knowles to a 2-year contract worth a total of $3,560,000. |
| Tuesday, November 25th, 2014 | | SP Stanton Preston was designated for assignment and placed on waivers. |
| Wednesday, November 19th, 2014 | | Signed SP Millard Snow to a 4-year contract extension worth a total of $7,144,500. |
| Tuesday, November 18th, 2014 | | SP David Gallagher received a 1-year contract through automatic renewal worth a total of $400,000. | | RF Pedro Cruz received a 1-year contract through automatic renewal worth a total of $400,000. | | CF Mustefa Kazilawe becomes a free-agent. | | C Jin-young Om becomes a free-agent. | | 1B Cam Thomason becomes a free-agent. | | C Héctor Muñóz received a 1-year contract through automatic renewal worth a total of $400,000. | | SP Paco Quintero becomes a free-agent. | | 3B Gabriel Fernández received a 1-year contract through automatic renewal worth a total of $400,000. | | MR Dennis Walsh received a 1-year contract through automatic renewal worth a total of $400,000. |
| Saturday, November 15th, 2014 | | 2B Dave Hunter received a 1-year contract through arbitration worth a total of $3,000,000. | | LF Ed Jones becomes a free-agent. | | MR Félix Luján received a 1-year contract through arbitration worth a total of $1,140,000. | | SP Allen Lowe received a 1-year contract through arbitration worth a total of $2,200,000. | | SP Artie Patterson received a 1-year contract through arbitration worth a total of $4,004,000. | | MR Oscar Butler received a 1-year contract through arbitration worth a total of $600,000. | | 2B Wayne Walker received a 1-year contract through arbitration worth a total of $2,600,000. | | 1B Jeff Williams received a 1-year contract through arbitration worth a total of $2,570,000. | | CL Konosuke Ohashi received a 1-year contract through arbitration worth a total of $888,000. | | LF José Cantú received a 1-year contract through arbitration worth a total of $6,500,000. | | C Dave Connolly received a 1-year contract through arbitration worth a total of $800,000. |
| Sunday, November 9th, 2014 | | Signed scouting director Rodrigo Colón to a 3-year, $240,000 per year contract. |
| Wednesday, October 29th, 2014 | | Executed the last optional contract year of SP José Macías. |
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