The following faith-based, SRI, public and labor funds, comptrollers, treasurers and asset managers are members of IOA:
- Aberdeen Standard
- Adrian Dominican Sisters
- Aegon Asset Management
- American Federation of Teachers Pension Plan
- Aquinas Association
- Bailard, Inc.
- Benedictine Coalition for Responsible Investment
- Bon Secours Mercy Health
- Boston Common Asset Management
- Bricklayers & Trowel Trades International Pension Funds
- California State Teachers' Retirement System
- California State Treasurer’s Office
- Calvert Research and Management
- Catholic Health Initiatives
- CTW Investment Group
- City of Philadelphia Public Employees’ Retirement System
- Congregation of St. Joseph
- Connecticut State Treasurer's Office
- Daughters of Charity, Province of St. Louise
- Dignity Health
- Diocese of Springfield, IL
- Domini Impact Investments
- Dominican Sisters of Springfield, IL
- Guidestone Financial Resources of the Southern Baptist Convention
- Hermes Equity Ownership Services
- Illinois State Treasurer’s Office
- Interfaith Center on Corporate Responsibility
- International Brotherhood of Teamsters
- JLens Investor Network
- Mercy Investment Services
- NEI Investments
- Neuberger Berman
- New York State Common Retirement Fund
- Northwest Coalition for Responsible Investment
- OIP Trust / Missionary Oblates of Mary Immaculate
- Office of the New York City Comptroller
- Pennsylvania Treasurer’s Office
- Region VI Coalition for Responsible Investment
- Rhode Island Treasurer’s Office
- School Employees Retirement System of Ohio
- Segal Marco Advisors
- Seventh Generation Interfaith Coalition for Responsible Investment
- Sisters of St. Francis of Philadelphia
- Socially Responsible Investment Coalition
- The Socially Reponsive Investing Group of 1919 Investment Counsel
- Trinity Health
- UAW Retiree Medical Benefits Trust
- United Church Funds
- Vermont State Treasurer's Office
- Walden Asset Management
- Wespath Benefits and Investments
- West Virginia State Treasurer’s Office
- Zevin Asset Management, LLC