| | | Monday, October 5th, 2015 | | Signed CF Javier López to a 3-year contract extension worth a total of $2,070,000. |
| Tuesday, September 8th, 2015 | | Placed RF Manuel Pérez on the 15-day disabled list. |
| Sunday, July 19th, 2015 | | Signed Tom Butler to a minor league contract with a signing bonus of $150,000. |
| Thursday, July 16th, 2015 | | Signed Roy Bell to a minor league contract with a signing bonus of $460,000. |
| Monday, July 13th, 2015 | | Signed Ramón Serrano to a minor league contract with a signing bonus of $150,000. |
| Saturday, July 11th, 2015 | | CL Naoki Jouda was claimed off waivers from Lancaster. | | Signed Ryan Wells to a minor league contract with a signing bonus of $190,000. |
| Monday, July 6th, 2015 | | Signed Jack Brown to a minor league contract with a signing bonus of $200,000. |
| Thursday, July 2nd, 2015 | | Signed Mike Stevens to a minor league contract with a signing bonus of $290,000. |
| Friday, June 26th, 2015 | | Placed MR John Rodgers on the 60-day disabled list. |
| Saturday, June 20th, 2015 | | Signed Anastasio Márquez to a minor league contract with a signing bonus of $1,160,000. |
| Wednesday, June 17th, 2015 | | Signed Owen Smith to a minor league contract with a signing bonus of $1,400,000. |
| Wednesday, May 27th, 2015 | | Signed SP Héctor Brito to a 3-year contract extension worth a total of $2,400,000. |
| Tuesday, April 7th, 2015 | | RF Donald Wagner was designated for assignment and placed on waivers. | | Placed CF Javier López on the active roster. | | Activated CF Javier López from the disabled list. |
| Monday, March 9th, 2015 | | Placed CF Javier López on the 15-day disabled list. |
| Monday, January 26th, 2015 | | Placed SS Jason Jackson on the active roster. |
| Tuesday, January 20th, 2015 | | Signed free agent SS Jason Jackson to a 1-year contract worth a total of $860,000. |
| Saturday, January 3rd, 2015 | | Signed free agent CL Zak Fisher to a 4-year contract worth a total of $14,480,000. |
| Tuesday, December 30th, 2014 | | Signed free agent SP Jeremy Méndez to a 1-year contract worth a total of $850,000. |
| Tuesday, November 18th, 2014 | | MR Joe O'Fallon received a 1-year contract through automatic renewal worth a total of $400,000. | | 2B Gustavo Hernández received a 1-year contract through automatic renewal worth a total of $400,000. | | RF Enrique Marrero received a 1-year contract through automatic renewal worth a total of $400,000. | | LF Juan Guerimo-Barre received a 1-year contract through automatic renewal worth a total of $400,000. | | CL Bob Weaver received a 1-year contract through automatic renewal worth a total of $400,000. | | MR Ryan Tickle received a 1-year contract through automatic renewal worth a total of $400,000. | | C Dave Steele received a 1-year contract through automatic renewal worth a total of $400,000. | | SS John Robinson received a 1-year contract through automatic renewal worth a total of $400,000. | | 2B António Rivera becomes a free-agent. | | MR Andy Kilgorran received a 1-year contract through automatic renewal worth a total of $400,000. |
| Saturday, November 15th, 2014 | | MR Ken Lawson received a 1-year contract through arbitration worth a total of $600,000. | | SP Monty Skinner becomes a free-agent. | | CF Javier López received a 1-year contract through arbitration worth a total of $622,500. | | 1B Lonnie Gómez becomes a free-agent. | | 2B Phil Brown becomes a free-agent. | | C Domingo Martínez received a 1-year contract through arbitration worth a total of $970,000. | | SS Santiago Rivera received a 1-year contract through arbitration worth a total of $950,000. | | SP Héctor Brito received a 1-year contract through arbitration worth a total of $600,000. | | 3B Joe Palk received a 1-year contract through arbitration worth a total of $4,912,500. |
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