| Saturday, December 29th, 2018 |
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| Placed CL Felipe Ramos on the active roster. |
| Sunday, December 23rd, 2018 |
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| Signed free agent CL Felipe Ramos to a 4-year contract worth a total of $21,000,000. |
| Monday, December 10th, 2018 |
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| Signed free agent MR Fernando Alvarado to a 1-year contract worth a total of $760,000. |
| Saturday, December 1st, 2018 |
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| Signed free agent RF Luis Ruíz to a 1-year contract worth a total of $400,000. | | Traded 34-year-old starting pitcher José Brito to the Austin River Sharks, getting $5,000,000 in cash in return. | | Demoted SS Si-dao Ci to Single A Colorado. | | Demoted CF Marc Ploughman to Single A Colorado. | | Placed RF Luis Ruíz on the active roster. | | Recalled 3B José Baca from Triple A Mexico City. | | Purchased the contract of 2B Emery McGaughey from Triple A Mexico City. | | Drafted MR Jesús Mendoza in the 2018 Rule 5 Draft (Round 1, Pick 22, 22nd overall Pick), from the Orlando Calrissian. | | Drafted MR Carlos Berru in the 2018 Rule 5 Draft (Round 2, Pick 22, 50th overall Pick), from the Orlando Calrissian. |
| Tuesday, November 20th, 2018 |
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| CF Jorge Cruz becomes a free-agent. | | CL Louis Genest becomes a free-agent. | | SP Cooper Moore received a 1-year contract through automatic renewal worth a total of $400,000. | | MR Jacob Jones received a 1-year contract through arbitration worth a total of $4,200,000. | | SS Roger Anderson becomes a free-agent. | | MR Arturo Ruíz becomes a free-agent. |
| Saturday, November 17th, 2018 |
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| RF Ernest Cole was not offered arbitration, becomes a free agent. | | C Jeffrey Howard received a 1-year contract through arbitration worth a total of $986,000. |
| Saturday, November 10th, 2018 |
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| Signed SP José Brito to a 3-year contract extension worth a total of $13,000,000. |
| Friday, November 9th, 2018 |
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| Signed CF Scott Powers to a 2-year contract extension worth a total of $7,500,000. | | Signed 3B Jeremy Atkins to a 2-year contract extension worth a total of $2,500,000. | | Signed 1B Oliver Castillo to a 3-year contract extension worth a total of $21,500,000. | | Signed SP Tony Arthur to a 3-year contract extension worth a total of $9,500,000. | | Signed SP Juan Maldonado to a 4-year contract extension worth a total of $24,000,000. | | Signed SS Miguel Encarnación to a 4-year contract extension worth a total of $6,000,000. | | Signed hitting coach José Villalobos to a 5-year, $290,000 per year contract. | | Signed pitching coach Fernando Vega to a 5-year, $240,000 per year contract. |
| Saturday, October 27th, 2018 |
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| SP Tony Arthur voids his last optional contract year. | | SS José Rosa has executed his last optional contract year. | | Pitching Coach Mario González leaves the team, his contract was not renewed. | | Hitting Coach Vitaliano Belloli leaves the team, his contract was not renewed. |
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