A subset of customers that have been grouped to use certain Swift services and products in a defined context (typically, the participation of customers in a market infrastructure, a Member-Administered Closed User Group, or a solution). Either Swift or a service administrator defines the eligibility criteria and participation in the Closed User Group.

A Closed User Group implemented in support of a service managed by a market infrastructure (MI).

Member-Administered Closed User Group. A Swift-operated, member-managed service that uses messaging service. The Member-Administered Closed User Group is designed to enable users that participate in the Closed User Group to exchange Swift messages bilaterally with the service administrator, or with the administrator-related participant.