The Institutional Investor Institute for Defined Contribution (IIIDC) is a private membership organization for the nation's largest DC plans as well as supporting members from asset management firms, providers, and consultants responsible for overseeing business development in the DC arena.

Both members and supporting members of the institute come together in exclusive settings that foster idea exchange while working to achieve common goals. The environment is collegial and collaborative, with overt marketing strictly prohibited.

Devised by plan sponsors for plan sponsors, the agenda for each meeting draws heavily on current best practices and the issues most relevant to the nation's larger plans.