In order to reap the benefits which the Internet offers, users often have to provide personal information over the Web. Data types that are frequently required by online vendors include names, mailing and e-mail addresses, telephone numbers or credit card numbers. Previous research has identified several antecedents which influence users‟ decisions on providing personal details over the Web. This paper adds to the existing research by scrutinizing the concept of personal information and positing an individual's perceived risk of personal information as an antecedent of information disclosure. The results of an empirical survey show that users differentiate between various types of personal data according to the risk of privacy intrusion. Perceived risk of personal information turns out to be a stronger predictor for the intention to provide personal information online than trust in the Internet or in the online vendor.