| Monday, December 24th, 2018 |
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| Signed free agent MR Alejandro López to a 1-year contract worth a total of $1,080,000. |
| Sunday, December 23rd, 2018 |
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| Signed free agent MR Roberto López to a 2-year contract worth a total of $1,920,000. |
| Wednesday, December 12th, 2018 |
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| Signed MR Takafumi Ogusuku to a 4-year contract extension worth a total of $3,400,000. | | Signed CL Ricardo Sánchez to a 4-year contract extension worth a total of $3,200,000. |
| Monday, December 10th, 2018 |
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| Signed 2B William Martel to a 4-year contract extension worth a total of $6,250,000. |
| Friday, December 7th, 2018 |
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| Signed SP Okura Oike to a 4-year contract extension worth a total of $6,500,000. |
| Saturday, December 1st, 2018 |
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| Signed free agent C Todd Roberts to a 1-year contract worth a total of $1,100,000. | | Signed free agent SP Ricardo Maldonado to a 1-year contract worth a total of $900,000. | | Traded 19-year-old minor league starting pitcher Arturo Leal and $1,000,000 in cash to the Toronto Titans, getting 31-year-old starting pitcher George Hepple in return. | | Traded 23-year-old minor league closer Carlos Ruíz to the Toronto Titans, getting 30-year-old minor league left fielder Manuel Mozcado and 26-year-old minor league starting pitcher Glen Jones in return. | | Drafted MR Leonardo Rodríguez in the 2018 Rule 5 Draft (Round 1, Pick 9, 9th overall Pick), from the Orlando Calrissian. | | Lost SP Pepe Fernández in the Rule 5 Draft to the Vista Panthers. |
| Tuesday, November 20th, 2018 |
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| 1B Yasuhiko Onodera received a 1-year contract through automatic renewal worth a total of $400,000. | | SP Nicoláo Gericota received a 1-year contract through automatic renewal worth a total of $400,000. | | 2B William Martel received a 1-year contract through automatic renewal worth a total of $400,000. | | 3B Qian-gui Ou-yang received a 1-year contract through automatic renewal worth a total of $400,000. | | SP Okura Oike received a 1-year contract through automatic renewal worth a total of $400,000. | | MR Kyoshi Asano received a 1-year contract through automatic renewal worth a total of $400,000. |
| Saturday, November 17th, 2018 |
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| RF José Figueroa received a 1-year contract through arbitration worth a total of $750,000. | | MR Takafumi Ogusuku received a 1-year contract through arbitration worth a total of $650,000. | | CL Ricardo Sánchez received a 1-year contract through arbitration worth a total of $650,000. | | MR Fernando Reyes received a 1-year contract through arbitration worth a total of $950,000. |
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