Nowadays in Malaysia, there are a lot of private companies using their official website to promote their products and services to the customer. This is because people are more flexible and aware with online advertisement rather than traditional advertising. This structure is based on the characteristics, sub-characteristics and attributes of three main dimensions (complexity, compatibility and relative advantage) that verified the adoption of website according to particular sector of activity and perspective.This study examines the adoption of website for private business sector, specifically in the area of Klang Valley. Data from a questionnaire survey of 150 respondents among 5 private companies in Klang Valley includes Petronas, Openet Telecom Malaysia, Wealth Mastery Academy, SALAM Medical Centre, and World-class Trade and Development are used to answer the research question “do the complexity, compatibility and relative advantage of website affect the way website is adopted in organization in Klang Valley?” The main findings revealed that the most significant predictors of the adoption of website in organization in Klang Valley is complexity.