| | | Sunday, June 15th, 1958 | | Promoted SS Dan Johnston to Double A Brownsville. | | Received CF Gerry Gillorn from Double A Brownsville. | | Promoted MR Claudio Hernández to Double A Brownsville. | | Promoted RF Tadahisa Shirai to Double A Brownsville. | | Received SP Chad Zwicker from Double A Brownsville. | | Received RF Raúl Aguilar from Double A Brownsville. | | Received 3B Phil Hall from Triple A Hamilton. | | Received 3B Xu Sen from Triple A Hamilton. | | Drafted 3B Phil Phillips in the 1958 first-year player draft (Round 6, Pick 9, 95th overall pick). | | Drafted SP Henry Stewart in the 1958 first-year player draft (Round 7, Pick 9, 112nd overall pick). | | Drafted 2B Yoshino Sekine in the 1958 first-year player draft (Round 8, Pick 9, 128th overall pick). | | Drafted MR Mauro Hernández in the 1958 first-year player draft (Round 9, Pick 9, 144th overall pick). | | Drafted 1B Eric Moser in the 1958 first-year player draft (Round 10, Pick 9, 160th overall pick). |
| Tuesday, May 27th, 1958 | | Placed LF Mario Cartina on the 15-day disabled list. |
| Tuesday, February 11th, 1958 | | Activated SP Justin Porter from the disabled list. |
| Saturday, February 1st, 1958 | | Activated CL Javier Silva from the disabled list. |
| Wednesday, September 18th, 1957 | | Activated CF Gerry Gillorn from the disabled list. |
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