The Navy said Wednesday that it had suspended a ship-supply company for significantly overcharging on a contract, the second such suspension since mid-September.

The company, Inchcape Shipping Services, owned by the Dubai-based Istithmar World, mainly supplies Navy ships in the Mediterranean and the Middle East.

The Navy is already grappling with a criminal investigation of its main ship supplier in the Pacific, Glenn Defense Marine Asia, whose owner, Leonard Glenn Francis, was arrested in September on charges of conspiring to bribe Navy officials with prostitutes and gifts.

Three Navy officials have been charged with bribery conspiracy in their dealings with Mr. Francis. Four others, including two admirals, have been suspended by the Navy in connection with the investigation.