The largest 500 U.S. companies hold more than $2.1-trillion (U.S.) in profits offshore to avoid domestic taxes, with 30 firms accounting for 65 per cent (or $1.4-trillion) of that amount, according to a new study from two nonprofit groups. By the end of 2014, more than half of Fortune 500 companies reported holding offshore cash and nearly three quarters operated subsidiaries in "tax haven jurisdictions," the Citizens for Tax Justice and the U.S. Public Interest Research Group Education Fund said in their study.