Social Security Office | 425 followers on LinkedIn. The Social Security Office (SSO) was established in 1990 as a government office responsible for managing the Social Security Fund and the Workmen’s Compensation Fund. As of 31 Dec 2010, the Social Security Fund, which provides coverage to over 9.4 million private employees, has total assets of 789,181 million Baht (approx. US$25 billion).