Northrop Ship Unit Said to Interest KKR, Bain, Carlyle, TPG

Four private-equity firms are exploring bids for Northrop Grumman Corp.’s shipbuilding unit, which may draw offers for at least $2.5 billion by a deadline next week, said people with knowledge of the matter.

Bain Capital LLC, Carlyle Group, KKR & Co. and TPG Capital have been examining the unit’s finances and meeting with its executives, said the people, who spoke on condition of anonymity because the talks are private. The price may range from $2.5 billion to more than $3 billion, the people said.