U.S. business groups are pressing President Barack Obama to use trade negotiations with nations ringing the Pacific to tighten regulations on state-owned companies that serve as government-subsidized competitors… “We need to find how we make the playing field level,” said Alan Wolff, a lawyer at Dewey & LeBoeuf LLP in Washington. U.S. trade officials are “quite concerned because the business community is quite concerned about the role of state-owned enterprises.”… Wolff will speak on state-owned businesses today at a forum on the issue in Washington hosted by the National Foreign Trade Council, which represents companies such as Boeing of Chicago, the world’s largest aerospace company, and JPMorgan of New York, the second-largest U.S. bank by assets after Bank of America Corp.