J.P. Morgan Chase JPM +0.25% & Co. has been holding discussions with U.K. regulators about the roughly $2 billion of trading losses incurred by the giant bank's investment office, according to people familiar with the matter. The talks with the Financial Services Authority don't represent a formal inquiry by the regulator, one person said, and it isn't clear whether it will result in any action by the regulatory agency. The FSA has been requesting information from J.P. Morgan about how the trading losses occurred and what steps the bank is taking to avoid such situations in the future, the people said. J.P. Morgan late Thursday disclosed that it had suffered at least $2 billion in losses stemming from soured bets made by its chief investment office. The New York-based unit has a large presence in London, where more than a dozen traders place wagers using the bank's own funds. Last month, The Wall Street Journal and other news organizations reported tha...