Move Inc., the parent company of Realtor.com, is suing CoStar Group, the parent company of rival Homes.com, over the alleged theft of portal data and documents. In a complaint filed on Tuesday in U.S. District Court in California, Move alleges that James Kaminsky, a former employee who now works for CoStar, stole trade secrets to help fuel the rapid growth of Homes.com. “There is nothing wrong with...