AWS Resource Access Manager (RAM) introduced a configuration with the RetainSharingOnAccountLeaveOrganization parameter that keeps resource shares active even when accounts move out of AWS Organizations. This feature helps maintain access to shared resources like Transit Gateways and IPAM pools during mergers, acquisitions, or restructurings without interruption.
The capability requires explicit invitations to accounts treated as external after leaving an organization, and security teams can enforce the setting via Service Control Policies. This ensures continuity and consistent policy enforcement across evolving organizational boundaries at no additional cost throughout AWS Regions.
Source & further reading
AWS Resource Access Manager now supports maintaining shares when accounts change organizations ↗Source published 2026-02-27. This report was prepared with AI assistance from the linked primary-source material. Claims and limitations should be checked against the original announcement or research.