| | | Wednesday, October 7th, 2015 | | Placed 3B John Burton on the active roster. | | Activated 3B John Burton from the 60-day disabled list. | | 1B Sang-Seung Sin was designated for assignment and placed on waivers. |
| Wednesday, September 16th, 2015 | | Signed CF José Sánchez to a 4-year contract extension worth a total of $54,050,000. |
| Friday, July 3rd, 2015 | | Signed José Gado to a minor league contract with a signing bonus of $2,990,000. | | Placed 3B John Burton on the 60-day disabled list. | | Purchased the contract of 3B Duane John from Triple A Newport News. |
| Wednesday, July 1st, 2015 | | Signed Sean Frazier to a minor league contract with a signing bonus of $2,000,000. |
| Tuesday, June 30th, 2015 | | Signed Joe Eayres to a minor league contract with a signing bonus of $1,210,000. |
| Sunday, June 28th, 2015 | | Signed John Moye to a minor league contract with a signing bonus of $300,000. |
| Sunday, May 10th, 2015 | | Signed 2B Jesús Guandique to a 4-year contract extension worth a total of $62,652,000. |
| Saturday, May 9th, 2015 | | Signed LF Kazunori Mizuno to a 3-year contract extension worth a total of $3,450,000. |
| Tuesday, April 7th, 2015 | | LF Colin McKee was designated for assignment and placed on waivers. |
| Monday, March 16th, 2015 | | Placed MR Jeremy Gregg on the 60-day disabled list. |
| Monday, February 2nd, 2015 | | Placed SP Jing-bo Qiu on the active roster. |
| Saturday, January 24th, 2015 | | Signed free agent SP Jing-bo Qiu to a 2-year contract worth a total of $6,980,000. |
| Saturday, January 10th, 2015 | | Signed free agent SP Gonzalo Morales to a 2-year contract worth a total of $15,540,000. |
| Monday, December 8th, 2014 | | Placed MR Kent Hill on the active roster. | | Placed SP Glenn Ray on the active roster. | | Activated SP Glenn Ray from the 60-day disabled list. |
| Friday, December 5th, 2014 | | Signed free agent MR Kent Hill to a 1-year contract worth a total of $1,480,000. |
| Tuesday, November 18th, 2014 | | MR José Balbuena becomes a free-agent. | | 3B Joe McLaughlin received a 1-year contract through automatic renewal worth a total of $400,000. | | SP Mike Hutchence received a 1-year contract through automatic renewal worth a total of $400,000. | | SP Kevin Ingall received a 1-year contract through automatic renewal worth a total of $400,000. | | RF David Jaramillo received a 1-year contract through automatic renewal worth a total of $400,000. | | CF Dan Kingston received a 1-year contract through automatic renewal worth a total of $400,000. | | C Rudy van Burgersdijk received a 1-year contract through automatic renewal worth a total of $400,000. | | MR Miguel Herrera becomes a free-agent. | | MR Colby Ewing received a 1-year contract through automatic renewal worth a total of $400,000. |
| Saturday, November 15th, 2014 | | SP Don Gibson becomes a free-agent. | | C Carl Poole received a 1-year contract through arbitration worth a total of $800,000. | | RF Derek Beardall received a 1-year contract through arbitration worth a total of $1,100,000. | | SP Leonard Ellis received a 1-year contract through arbitration worth a total of $600,000. | | 3B Ángel Segura becomes a free-agent. |
| Friday, November 14th, 2014 | | Signed CF Vicente Barrón to a 1-year contract extension worth a total of $800,000. |
| Thursday, November 13th, 2014 | | Signed MR Jeremy Gregg to a 1-year contract extension worth a total of $900,000. |
| Wednesday, November 12th, 2014 | | Signed SP Glenn Ray to a 1-year contract extension worth a total of $800,000. |
| Friday, November 7th, 2014 | | Signed 2B Bill Beach to a 3-year contract extension worth a total of $9,600,000. |
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