| | | Wednesday, October 7th, 2015 | | Placed RF Axel Wellby on the active roster. | | Activated RF Axel Wellby from the disabled list. |
| Wednesday, September 23rd, 2015 | | Placed SP José Fernández on the 15-day disabled list. |
| Sunday, September 6th, 2015 | | Signed MR Harry Harperson to a 1-year contract extension worth a total of $800,000. |
| Saturday, July 4th, 2015 | | Signed Howard Fields to a minor league contract with a signing bonus of $320,000. |
| Thursday, July 2nd, 2015 | | Signed Ambrose Simpson to a minor league contract with a signing bonus of $340,000. |
| Wednesday, July 1st, 2015 | | Signed Ben Stafford to a minor league contract with a signing bonus of $500,000. |
| Friday, June 19th, 2015 | | Signed César Mandelbaum to a minor league contract with a signing bonus of $2,930,000. |
| Wednesday, June 17th, 2015 | | Signed LF Nick Callahan to a 3-year contract extension worth a total of $3,300,000. | | Signed Eric Billingham to a minor league contract with a signing bonus of $2,800,000. |
| Monday, June 15th, 2015 | | RF Bernardo Huerta was designated for assignment and placed on waivers. | | Placed RF Axel Wellby on the active roster. | | Activated RF Axel Wellby from the disabled list. |
| Tuesday, June 9th, 2015 | | CL Joe Baldwin was designated for assignment and placed on waivers. | | Purchased the contract of MR Sam Day from Triple A Wichita. |
| Tuesday, May 19th, 2015 | | Placed SP Rocky Edwards on the 60-day disabled list. |
| Saturday, April 18th, 2015 | | SP Kyle Long was designated for assignment and placed on waivers. | | Placed MR Jack Melton on the active roster. |
| Monday, March 9th, 2015 | | Placed LF Nick Callahan on the 15-day disabled list. |
| Saturday, February 28th, 2015 | | Signed free agent RF Mario Macías to a 1-year contract worth a total of $1,780,000. |
| Monday, January 26th, 2015 | | Signed free agent RF Axel Wellby to a 2-year contract worth a total of $2,440,000. | | Placed RF Axel Wellby on the active roster. |
| Monday, January 19th, 2015 | | Placed 2B Julian Ewing on the active roster. |
| Friday, January 16th, 2015 | | Signed free agent 2B Julian Ewing to a 2-year contract worth a total of $1,200,000. |
| Monday, December 1st, 2014 | | Drafted SP Andy Glendenning in the 2014 Rule 5 Draft (Round 1, Pick 8, 8th overall Pick), from the Juno Jazz. | | Drafted 3B Félix González in the 2014 Rule 5 Draft (Round 2, Pick 8, 38th overall Pick), from the Hot Coffee Steamers. | | Drafted 3B Willie Vickers in the 2014 Rule 5 Draft (Round 3, Pick 8, 68th overall Pick), from the Vancouver Mounties. |
| Tuesday, November 18th, 2014 | | SS Jian-zhang Ching received a 1-year contract through automatic renewal worth a total of $400,000. | | CF Zeffun Maddaford received a 1-year contract through automatic renewal worth a total of $400,000. | | C Jon Brooks received a 1-year contract through automatic renewal worth a total of $400,000. | | 3B Roosevelt Barrett received a 1-year contract through automatic renewal worth a total of $400,000. | | LF Miguel Morales received a 1-year contract through automatic renewal worth a total of $400,000. | | MR Jake Sargent received a 1-year contract through automatic renewal worth a total of $400,000. | | 1B Vincent Beaupré received a 1-year contract through automatic renewal worth a total of $400,000. | | CL Ed McAllen received a 1-year contract through automatic renewal worth a total of $400,000. | | CF Paul Henley received a 1-year contract through automatic renewal worth a total of $400,000. | | C Juan Carrillo received a 1-year contract through automatic renewal worth a total of $400,000. | | LF Chris Campbell received a 1-year contract through automatic renewal worth a total of $400,000. |
| Saturday, November 15th, 2014 | | SP Dennis Scott received a 1-year contract through arbitration worth a total of $665,000. | | 3B John Bullock received a 1-year contract through arbitration worth a total of $1,248,000. | | LF Nick Callahan received a 1-year contract through arbitration worth a total of $962,500. | | MR Jorge Ramírez received a 1-year contract through arbitration worth a total of $600,000. | | MR Harry Harperson received a 1-year contract through arbitration worth a total of $600,000. | | SP José Fernández received a 1-year contract through arbitration worth a total of $4,600,000. | | 1B Miguel Sánchez received a 1-year contract through arbitration worth a total of $6,500,000. | | CF Miguel Guerra received a 1-year contract through arbitration worth a total of $9,500,000. | | SS Jason Jackson becomes a free-agent. |
| Saturday, October 25th, 2014 | | 2B John Woodard has executed his last optional contract year. | | DH Sam Smart has executed his last optional contract year. |
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