| Saturday, September 6th, 1958 | Placed SP Glenn Knowles on waivers. | Tuesday, August 12th, 1958 | Signed William Sloan to a minor league contract with a signing bonus of $106,400. | Signed Carlos Romero to a minor league contract with a signing bonus of $5,600. | Thursday, July 31st, 1958 | Signed 1st round draft pick Hyeon-uk Ho for a signing bonus of $146,000 and a 3-year major league contract worth a total of $438,000. | Friday, July 18th, 1958 | Signed Rob Penton to a minor league contract with a signing bonus of $11,200. | Thursday, July 17th, 1958 | Purchased the contract of RF Paul Hicks from Triple A Keswick. | 3B Juan Jiménez was designated for assignment and placed on irrevocable waivers. | Saturday, July 12th, 1958 | Signed David Negrete to a minor league contract with a signing bonus of $7,500. | Sunday, April 13th, 1958 | Purchased the contract of SP Glenn Knowles from Triple A Keswick. | MR Jon Dennis was designated for assignment and placed on waivers (from active). | Wednesday, April 9th, 1958 | Placed SP Luis Icaza on the 60-day disabled list. | Wednesday, April 2nd, 1958 | Placed RF William Harrison on the 15-day disabled list. | |
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