Investment Adviser Association | 5,523 followers on LinkedIn. Representing Fiduciary Investment Advisers - Your Voice, Your Resource, Your Community | The Investment Adviser Association is a not-for-profit organization that exclusively represents the interests of fiduciary investment adviser firms. The IAA membership manages in excess of $25 trillion in assets for a wide variety of institutional and individual clients, including pension plans, trusts, investment companies, private funds, endowments, foundations, and corporations. The IAA serves as the advocate for fiduciary investment advisory firms with respect to every major issue that arises before the U.S.