| Thursday, September 26th, 1957 | Activated 2B José Medina from the disabled list. | Sunday, September 15th, 1957 | Activated SP José Sánchez from the 60-day disabled list. | MR Subaru Yamamoto was designated for assignment, placed on waivers and taken off the 40-man roster. | Saturday, September 14th, 1957 | Placed LF Palmer Camp on waivers. | Sunday, September 8th, 1957 | Activated LF Pablo Fuentes from the disabled list. | Activated SS Roger Harding from the 60-day disabled list. | CF Jorge Romero was designated for assignment, placed on waivers and taken off the 40-man roster. | Tuesday, September 3rd, 1957 | Activated RF Dan Middleton from the disabled list. | Wednesday, August 14th, 1957 | Failed to sign 8th round draft pick John O'Higgins. | Monday, August 12th, 1957 | Signed Rich Stebbins to a minor league contract with a signing bonus of $3,600. | Saturday, August 10th, 1957 | Signed 1st round draft pick Adam Magee for a signing bonus of $19,400 and a 2-year major league contract worth a total of $38,800. | Placed RF Palmer Camp on waivers. | Wednesday, August 7th, 1957 | Signed 1st round draft pick Elijah Fisher for a signing bonus of $41,600 and a 2-year major league contract worth a total of $83,200. | Signed Miguel Garza to a minor league contract with a signing bonus of $27,500. | Monday, August 5th, 1957 | Placed RF Palmer Camp on waivers. | Tuesday, July 23rd, 1957 | Placed SP Cal Gross on the 60-day disabled list. | Friday, July 19th, 1957 | Signed Albert Gonzáles to a minor league contract with a signing bonus of $3,300. | Wednesday, October 17th, 1956 | Activated LF Alfred Adams from the disabled list. | RF Dane Roberts was designated for assignment and placed on irrevocable waivers. | |
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