The paper investigates the unauthorized trading indulged in client's accounts by the trading members of the stock exchanges. Trading systems, misuses and abuses of the securities market by trading members have been identified and analyzed. It finds how some trading members violate trading rules, misinterpret regulatory compliances and indulge unauthorized trading. The findings and conclusions provide inputs for the development of appropriate regulatory framework for the securities market. However, the results may be generalized in the emerging markets environment. Hence, researchers are advised to study trading practices, stock market operations, appreciate the dynamics of stock market and apply the same in their future research in India and abroad. * This paper is based on an arbitration matter resolved through Alternative Dispute Resolution (ADR) mechanism at the leading stock exchange of India. The names of the applicant, respondent, names of stock, stock exchange, and monetary ures were disguised to preserve confidentiality.