This paper examines empirically the effects of domicile and SEC registration and reporting requirements on information asymmetry. We compare the adverse-selection component of the relative bid–ask spread (our measure of information asymmetry) for three samples of Nasdaq NMS companies that trade in different home markets and are subject to different standards of disclosure: registered U.S. companies, registered non-Canadian foreign companies, and unregistered non-Canadian foreign companies covered by the information-supplying exemption of the Securities and Exchange Act of 1934. We find that the adverse-selection component is not significantly larger for the two foreign samples, and it is not reliably different for the registered and unregistered foreign samples. Therefore, we are unable to document that less stringent SEC registration and reporting requirements for foreign companies are associated with greater information asymmetry among investors for non-U.S. securities traded on Nasdaq.

This paper estimates the performance of insider trades on the closely held Oslo Stock Exchange (OSE) during a period of lax enforcement of insider trading regulations. Our data permit construction of a portfolio that tracks all movements of insiders in and out of the OSE firms. Using three alternative performance estimators in a time‐varying expected return setting, we document zero or negative abnormal performance by insiders. The results are robust to a variety of trade characteristics. Applying the performance measures to mutual funds on the OSE, we also document some evidence that the average mutual fund outperforms the insider portfolio.