 GREENWICH, Conn.--BUSINESS WIRE--GAMCO Investors, Inc. GAMCO NYSE: GBL announced today that its Board of Directors approved a special dividend of 0.90 per share to all of its Class A and Class B shareholders, payable on December 15, 2020 to its shareholders of record on December 4, 2020. About GAMCO Investors, Inc. GAMCO is known for its research-driven approach to equity investing. GAMCO conducts its investment advisory business principally through two subsidiaries: GAMCO Asset Manage 