| | | Wednesday, September 23rd, 2015 | | Placed LF Felipe Silva on the active roster. | | Activated LF Felipe Silva from the disabled list. |
| Tuesday, September 8th, 2015 | | Placed CF Rafael Gavcia on the 15-day disabled list. |
| Tuesday, August 11th, 2015 | | Signed Jerry McTiernan to a minor league contract with a signing bonus of $1,590,000. |
| Friday, July 10th, 2015 | | Placed SS Ron Robinson on the 15-day disabled list. |
| Wednesday, July 1st, 2015 | | Signed Mark Mitchell to a minor league contract with a signing bonus of $240,000. |
| Thursday, June 25th, 2015 | | Signed Ramón De La Hoya to a minor league contract with a signing bonus of $230,000. |
| Wednesday, June 24th, 2015 | | Signed Will Barnes to a minor league contract with a signing bonus of $350,000. |
| Monday, June 22nd, 2015 | | Signed 1st round draft pick Bob Dooley for a signing bonus of $4,200,000 and a 3-year major league contract worth a total of $12,300,000. |
| Sunday, June 21st, 2015 | | Signed Rob Glendenning to a minor league contract with a signing bonus of $150,000. |
| Thursday, June 18th, 2015 | | Signed Jonathan Barr to a minor league contract with a signing bonus of $3,190,000. |
| Monday, June 15th, 2015 | | Placed 3B Julián Gallegos on the 15-day disabled list. |
| Tuesday, June 2nd, 2015 | | Placed LF Felipe Silva on the 15-day disabled list. |
| Tuesday, May 19th, 2015 | | Placed CF Geomar Cardone on the 15-day disabled list. |
| Tuesday, April 28th, 2015 | | Placed 2B Diego Hernández on the 15-day disabled list. |
| Monday, March 23rd, 2015 | | Placed MR Jim Larkin on the 60-day disabled list. |
| Tuesday, March 10th, 2015 | | Signed free agent SP Earl Phelps to a 1-year contract worth a total of $400,000. | | SP Jim Mooney was claimed off waivers from Providence. |
| Monday, March 9th, 2015 | | Placed MR Alberto Díaz on the 60-day disabled list. |
| Saturday, February 7th, 2015 | | Signed free agent MR Pedro Trinidad to a 1-year contract worth a total of $400,000. | | Signed free agent CF Félix Medina to a 1-year contract worth a total of $6,830,000. |
| Monday, January 26th, 2015 | | Placed C Gabriel Bruno on the active roster. |
| Saturday, January 24th, 2015 | | Signed free agent C Gabriel Bruno to a 3-year contract worth a total of $33,720,000. |
| Monday, January 19th, 2015 | | Placed MR John Smith on the active roster. |
| Saturday, January 17th, 2015 | | Signed free agent MR John Smith to a 2-year contract worth a total of $6,000,000. |
| Monday, December 29th, 2014 | | Placed RF Dave Abbott on the active roster. |
| Tuesday, December 23rd, 2014 | | Signed free agent RF Dave Abbott to a 1-year contract worth a total of $930,000. |
| Monday, December 22nd, 2014 | | Placed CF Dave Crimmins on the active roster. |
| Sunday, December 21st, 2014 | | Signed free agent CF Dave Crimmins to a 1-year contract worth a total of $420,000. |
| Thursday, December 18th, 2014 | | Signed free agent SP Ray Lyons to a 2-year contract worth a total of $800,000. |
| Friday, December 5th, 2014 | | Signed free agent 1B Ron Robinson to a 3-year contract worth a total of $10,953,525. |
| Thursday, December 4th, 2014 | | Signed free agent 3B Julián Gallegos to a 1-year contract worth a total of $990,000. |
| Sunday, November 30th, 2014 | | Signed free agent 2B Tokuma Jozume to a 1-year contract worth a total of $1,330,000. | | Signed free agent DH Mike Funk to a 2-year contract worth a total of $2,820,000. |
| Sunday, November 23rd, 2014 | | Signed RF Myles Snow to a 3-year contract extension worth a total of $37,500,000. |
| Tuesday, November 18th, 2014 | | LF José Sanduval becomes a free-agent. | | C António Rosado received a 1-year contract through automatic renewal worth a total of $400,000. | | CF Jim McFarland received a 1-year contract through automatic renewal worth a total of $400,000. | | MR Belarmino Martens received a 1-year contract through automatic renewal worth a total of $400,000. | | MR Bartolo Báez becomes a free-agent. | | MR Ángel López received a 1-year contract through automatic renewal worth a total of $400,000. | | 1B Yoshi Kichida becomes a free-agent. | | RF David Christian received a 1-year contract through automatic renewal worth a total of $400,000. | | SS Guy Wilson received a 1-year contract through automatic renewal worth a total of $400,000. | | MR Katsuhito Ogawa becomes a free-agent. | | CF Esteban Rivas received a 1-year contract through automatic renewal worth a total of $400,000. | | CL Kyuso Murakami becomes a free-agent. | | C Zach Jenkins received a 1-year contract through automatic renewal worth a total of $400,000. | | LF Guillermo Chávez received a 1-year contract through automatic renewal worth a total of $400,000. | | SS Jason Hubbard received a 1-year contract through automatic renewal worth a total of $400,000. |
| Saturday, November 15th, 2014 | | MR John Forrest received a 1-year contract through arbitration worth a total of $1,344,000. | | SP Clement Coffey received a 1-year contract through arbitration worth a total of $600,000. | | CF Geomar Cardone received a 1-year contract through arbitration worth a total of $600,000. | | SP Jack Wright becomes a free-agent. | | SS Francisco Mendoza received a 1-year contract through arbitration worth a total of $600,000. | | 1B Jared Askey received a 1-year contract through arbitration worth a total of $930,000. | | RF Myles Snow received a 1-year contract through arbitration worth a total of $11,000,000. | | DH Pedro Canales received a 1-year contract through arbitration worth a total of $600,000. | | 2B Dan Todd received a 1-year contract through arbitration worth a total of $600,000. | | SP Marcos Pineda received a 1-year contract through arbitration worth a total of $625,000. | | MR Tom Stone received a 1-year contract through arbitration worth a total of $2,400,000. | | SP Jesús Rivera received a 1-year contract through arbitration worth a total of $4,400,000. | | 1B Josh Johnson received a 1-year contract through arbitration worth a total of $600,000. |
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