| | | Thursday, August 14th, 1958 | | Failed to sign 4th round draft pick Anthony James. | | Thursday, August 7th, 1958 | | Signed Matthew Watson to a minor league contract with a signing bonus of $103,900. | | Signed Ken Slocum to a minor league contract with a signing bonus of $31,100. | | Thursday, July 31st, 1958 | | Signed Hugh Shafer to a minor league contract with a signing bonus of $13,300. | | Thursday, July 24th, 1958 | | Signed Carter Carpenter to a minor league contract with a signing bonus of $5,400. | | Saturday, June 14th, 1958 | | Activated LF Ángel Martínez from the disabled list. | | RF César García was designated for assignment and placed on irrevocable waivers. | |
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