The ASEAN Economic Community's (AEC) road map targets implementation by December 2015. It promotes a single market and production base by supporting the free flow of goods, services, investment, capital, and skilled labor. Although there are a number of studies related to the AEC, few studies, if any, address this issue from the perspective of private companies, especially in Thailand. In this study, a survey was conducted onexecutives in large Thai corporations listed on theStock Exchange of Thailand (SET), covering eight industries including retail, property, banking, telecommunications, oil and gas,chemicals, transportation, and food.Results showed that large Thai firms are aware of the AEC, but most of them do not have specific strategies for the AEC. Some of these firms have already entered other ASEAN markets, while others look further beyond. It seems that most executives in large Thai firms perceive the AEC as an opportunity for companies rather than a threat. However, they also believe that more in-depth AEC integration is required in order to fully utilize its benefits.