Mexican billionaire Carlos Slim Helu’s real estate holding company, Inmobiliaria Carso, S.A. de C.V., has acquired a 7.64% stake in Edmond, Oklahoma-based Bronco Drilling Company, Inc. (NASDAQ: BRNC), which has a contract to drill three wells for Pemex, according to an October 22, 2008 Schedule 13G SEC filing by Bronco.

All of the outstanding voting shares of Inmobiliaria Carso are controlled by a Mexican trust, the beneficiaries of which are Carlos Slim Helu and family members Carlos Slim Domit, Marco Antonio Slim Domit, Patrick Slim Domit, Maria Soumaya Slim Domit, Vanessa Paola Slim Domit and Johanna Monique Slim Domit. 

Inmobiliaria Carso purchased 2.2 million shares of Bronco on October 15, 2008 for approximately US$15 million, based on the company’s share price at the time of acquisition.