| Thursday, October 2nd, 1958 | Placed LF Mark Green on the 15-day disabled list. | Thursday, August 14th, 1958 | Failed to sign 10th round draft pick Eddie Seymour. | Wednesday, August 13th, 1958 | Signed Ben Sánchez to a minor league contract with a signing bonus of $5,800. | Sunday, August 10th, 1958 | Signed Alejandro Burgos to a minor league contract with a signing bonus of $6,000. | Thursday, August 7th, 1958 | Signed Pedro Pérez to a minor league contract with a signing bonus of $62,500. | Saturday, July 26th, 1958 | Placed SP Dan Rancourt on the 15-day disabled list. | Purchased the contract of SP Dan Burgess from Triple A Guelph. | Signed Gordon Curran to a minor league contract with a signing bonus of $4,500. | Thursday, July 24th, 1958 | Signed Larry Nicholas to a minor league contract with a signing bonus of $7,200. | Sunday, July 13th, 1958 | Signed Juan Mejía to a minor league contract with a signing bonus of $29,000. | Friday, June 20th, 1958 | Activated MR Carlos Cruz from the 60-day disabled list. | MR T.J. Moore was designated for assignment and placed on irrevocable waivers. | Saturday, June 7th, 1958 | 1B José Vázquez was designated for assignment and placed on waivers (from active). | Saturday, May 31st, 1958 | Activated LF Mark Green from the disabled list. | CF José Gonzáles was designated for assignment and placed on irrevocable waivers. | Monday, May 12th, 1958 | Placed SP Paul Braun on the 60-day disabled list. | Sunday, March 30th, 1958 | Placed MR Carlos Cruz on the 60-day disabled list. | Friday, March 7th, 1958 | Activated 3B Jesús Rúbio from the 60-day disabled list. | MR Rodion Famintsyn was designated for assignment, placed on waivers and taken off the 40-man roster. | |
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