 GREENWICH, Conn.--BUSINESS WIRE--GAMCO Investors, Inc. GAMCO NYSE: GBL today reported its operating results for the quarter ended December 31, 2020. Fourth Quarter Results Financial Highlights Unaudited Three Months Ended Year Ended In thousands, except per share data December 31, 2020 September 30, 2020 December 31, 2019 December 31, 2020 December 31, 2019 U.S. GAAP Basis Revenues 71,348 61,252 86,280 259,726 312,368 Operating income 23,684 31,842 33,043 99,609 