| Sunday, September 14th, 1958 | Activated CF Peter Mills from the disabled list. | Friday, September 12th, 1958 | Activated 3B Tsumemasa Yamanaka from the 60-day disabled list. | MR Johnny Anderson was designated for assignment, placed on waivers and taken off the 40-man roster. | Sunday, September 7th, 1958 | Activated CF José Cedeño from the disabled list. | Saturday, August 30th, 1958 | Placed MR Victor Buckley on the 60-day disabled list. | Activated SP Bill Pierce from the disabled list. | Thursday, August 14th, 1958 | Failed to sign 3rd round draft pick Juan Gonzáles. | Tuesday, August 5th, 1958 | Signed Albert Ortíz to a minor league contract with a signing bonus of $14,900. | Saturday, August 2nd, 1958 | Signed Lúcio Cardona to a minor league contract with a signing bonus of $4,500. | Monday, July 28th, 1958 | Signed Tokimune Shibata to a minor league contract with a signing bonus of $21,700. | Sunday, July 27th, 1958 | Signed Mike Flynn to a minor league contract with a signing bonus of $4,400. | Friday, June 6th, 1958 | Activated CF José Cedeño from the disabled list. | RF Allen Craig was designated for assignment and placed on irrevocable waivers. | Saturday, January 11th, 1958 | Activated SP Hidetoshi Watanabe from the 60-day disabled list. | SP Bill Pierce was designated for assignment and placed on waivers (from active). | Tuesday, October 29th, 1957 | Activated CF Gary Sampson from the 60-day disabled list. | RF Allen Craig was designated for assignment and placed on irrevocable waivers. | Sunday, October 20th, 1957 | Signed manager Steve Picot to a 4-year, $29,400 per year contract. | |
|