Due to the fact that Islamic financial securities may consist of ribawi (cash and debt) underlying assets, it is crucially important to discern whether or not the trading of these securities is subject to the Shari'ah rules for bay' al-sarf and bay' al-dayn. If they do not then what criterion is pertinent to their secondary trading; and on what jurisprudential basis? In answer to that question, the current scholarly views and suggested Shari'ah criteria for tradability of Islamic securities are not only diverse, but also at times incongruous with one another. Based on the qualitative approach of text analysis and semi-structured-interviews, this study critically analyse this issue ...