Of the total, 303 are in Chon Buri and 26 in Prachuap Khiri Khan, Deputy Commerce Minister Natthawut Saikua said Monday.
Of the 26 companies in Prachuap, two have confessed to the charges – a real-estate agent and a tailor.
Of the 303 companies in Chon Buri, 20 operate businesses listed in Appendix III of the FBA covering those in which Thais are not yet ready to compete with foreigners.