Mexican billionaire Carlos Slim Helu is now one of The New York Times Co.'s biggest stockholders. According to an SEC filing, his stake recently upped to 16.3%. More: E&P, Romenesko. He's a controversial fellow. Slim's net wealth equals about 2% of Mexico's total yearly economic output. Mexican telcom Telmex, of which Slim and family own roughly half, charges some of the highest usage fees in the world, according to the OECD.