By virtue of the Royal decree on Organisation of the Comptroller General’s Department, Ministry of Finance, B.E. 2520 (1977), the cabinet resolved to raise the status of the “State Enterprise Section” under the Revenue Division as the ‘State Enterprise Division”. The purpose was to improve its capacity and efficiency in supervision over state enterprises with specific focus on financial and accounting policy and human resources management.

The role of operational control of the Comptroller General’s Department, Ministry of Finance, was later changed to serve as an advisory and support unit, while its financial control has been increasingly decentralized to various government sectors and regional administration. In addition, several sections with similar mission and responsibility were merged into a single agency whose status is higher than that of a division. By virtue of the Royal Decree on Organisation of the Controller General’s Department, Ministry of Finance, B.E. 2538 (1995) the “State Enterprise Division” was entitled as the “Bureau of State Enterprises and Government Securities” The objective was to enable required versatility to manage the aforementioned administration.

After the economic crisis the government has emphasized more on effectiveness of state enterprises. In order to enhance its required capacity to achieve the aforementioned mission the “Bureau of State Enterprises and Government Securities” was leveraged to departmental level and was entitled as the “State Enterprise Policy Office (SEPO)” on 3 October 2002, by virtue of the Act on Organisation of Ministries, Sub-Ministries and Departments, B.E. 2545 (2002)