| Sunday, December 30th, 2018 |
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| Signed free agent SP Tommy Hunt to a 1-year contract worth a total of $1,200,000. |
| Saturday, December 1st, 2018 |
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| Placed LF Mason Mabbett on the 40-man roster. |
| Tuesday, November 20th, 2018 |
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| LF Arturo Rodríguez received a 1-year contract through automatic renewal worth a total of $400,000. | | 2B Stephen Shaw received a 1-year contract through automatic renewal worth a total of $400,000. | | SP John Garrett becomes a free-agent. | | CF José Estrada becomes a free-agent. | | SP Nick Herbert becomes a free-agent. | | CF Ramón Ayala received a 1-year contract through automatic renewal worth a total of $400,000. | | MR Cameron Rowde becomes a free-agent. | | MR Ciro Roghi becomes a free-agent. | | C Luis Barzaga received a 1-year contract through automatic renewal worth a total of $400,000. | | 3B Yasuhiro Kobayashi received a 1-year contract through automatic renewal worth a total of $400,000. |
| Saturday, November 17th, 2018 |
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| LF Júlio Padilla received a 1-year contract through arbitration worth a total of $2,097,000. | | C Jorge Flores received a 1-year contract through arbitration worth a total of $2,400,000. | | SS Manuel Solís received a 1-year contract through arbitration worth a total of $4,515,000. | | 3B John Brown received a 1-year contract through arbitration worth a total of $700,000. | | MR António Mata received a 1-year contract through arbitration worth a total of $650,000. | | RF Matsusuke Yamasaki received a 1-year contract through arbitration worth a total of $1,300,000. | | CF Sergio Rodríguez becomes a free-agent. |
| Monday, November 12th, 2018 |
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| Signed free agent CF Norogumi Tanaka to a minor league contract. |
| Saturday, November 10th, 2018 |
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| Signed bench coach Derek Walter to a 3-year, $750,000 per year contract. |
| Friday, November 9th, 2018 |
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| Signed MR Ricardo Liriano to a 2-year contract extension worth a total of $2,400,000. |
| Monday, November 5th, 2018 |
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| Executed the last optional contract year of 1B Tony Marín. | | Executed the last optional contract year of RF Luis Alou. | | Voided the team option year(s) of MR Ricardo Liriano. |
| Saturday, October 27th, 2018 |
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| DO Esteban Martínez retires. | | Bench Coach Rob Hanson leaves the team, his contract was not renewed. |
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