| | | Monday, October 6th, 1958 | | Activated RF Tony Lucas from the disabled list. |
| Wednesday, August 27th, 1958 | | Placed RF Tony Lucas on the 15-day disabled list. | | Purchased the contract of RF Mike Nadler from Triple A Oshawa. |
| Tuesday, August 12th, 1958 | | Signed Ben Collins to a minor league contract with a signing bonus of $44,000. |
| Saturday, August 9th, 1958 | | Signed Tom Robinson to a minor league contract with a signing bonus of $3,600. |
| Friday, August 8th, 1958 | | Signed Dale Hayes to a minor league contract with a signing bonus of $7,700. |
| Sunday, May 25th, 1958 | | Activated LF Albert Moore from the disabled list. | | RF Lou Gunn was designated for assignment and placed on waivers (from active). |
| Friday, May 2nd, 1958 | | Placed LF Albert Moore on the 15-day disabled list. | | Purchased the contract of RF Lou Gunn from Triple A Oshawa. |
| Thursday, April 17th, 1958 | | Placed RF Clay Carter on the 15-day disabled list. | | Purchased the contract of RF Cade Mayers from Triple A Oshawa. |
| Sunday, February 2nd, 1958 | | Signed free agent 1B Cisco Pérez to a 1-year contract worth a total of $13,400. | | Assigned 1B Cisco Pérez to Triple A Oshawa. |
| Thursday, January 30th, 1958 | | Activated CL José Núñez from the 60-day disabled list. | | MR Ken Blair was designated for assignment and placed on waivers (from active). |
| Wednesday, October 23rd, 1957 | | Activated 1B Jud Hale from the disabled list. | | SS Ron Williams was designated for assignment and placed on irrevocable waivers. |
| Sunday, October 20th, 1957 | | Signed scouting director Ismael Rodríguez to a 4-year, $8,200 per year contract. |
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