The plumbing industry's second largest national supply house chain, Hughes Supply, is now owned by Home Depot - or soon will be, depending on when they wrap up all the legalities of the takeover. This was Home Depot's largest acquisition ever, costing around $3.5 billion. Hughes operates some 500 branches in 40 states with $4.4 billion in annual sales. Hughes is now part of Home Depot Supply, whose revenues are projected to shoot past $12 billion this year.