Council of Institutional Investors | 4,391 followers on LinkedIn. Since 1985, CII has been THE VOICE of Corporate Governance & vibrant, transparent and fair capital markets. | We are the voice of Corporate Governance. The Council of Institutional Investors (CII) is a nonprofit, nonpartisan association of corporate, public and union employee benefit funds and endowments with a focused policy mission: to be the leading voice for effective corporate governance practices for U.S. companies and strong shareowner rights and protections. CII has more than 120 General Members with combined assets that exceed $3 trillion.