atc mexico holding 2014in january 2004 , mr . gearon exercised his previously disclosed right to require the company to purchase his 8.7% ( 8.7 % ) interest in atc mexico . giving effect to the january 2004 exercise of options described below , the company owns an 88% ( 88 % ) interest in atc mexico , which is the subsidiary through which the company conducts its mexico operations . the purchase price for mr