A U.S. Senate panel probing the multibillion-dollar trading lossby JPMorgan Chase & Co. plans to unveil its findings at ahearing this year to press regulators to tighten the Volcker rule,according to three people briefed on the matter.

Staff members of the Permanent Subcommittee on Investigations,headed by Senator Carl Levin, have interviewed JPMorgan officialsas well as examiners and supervisors at the institution'sregulator, the Office of the Comptroller of the Currency, said thepeople, who spoke on condition of anonymity because the inquiryisn't public.

One focus of the queries is whether JPMorgan's wrong-way bets onderivatives would have been permitted under regulators' initialdraft of the Volcker ban on proprietary trading, the people said.The lender lost $5.8 billion on the trades in the first six monthsof the year.