 GREENWICH, Conn.--BUSINESS WIRE--GAMCO Investors, Inc. GAMCO NYSE: GBL today reported its operating results for the quarter ended March 31, 2021. First Quarter Results Financial Highlights Unaudited Three Months Ended In thousands, except per share data March 31, 2021 March 31, 2020 U.S. GAAP Basis Revenues 67,928 69,567 Operating income 22,454 25,320 Net income 15,950 11,245 Diluted earnings per common share 0.59 0.42 Weighted average diluted shares outstanding 