Abstract
AbstractThe study examines insider ownership in large and small firms in relation to market efficiency. Recent studies have found a positive and significant relation between inside ownership and stock market performance. Such a finding is predicated upon the idea that inside ownership minimizes agency costs caused by the conflict between hired managers and shareholders. It is argued here that semi‐strong form market efficiency requires that all public information, including insider ownership, be quickly impounded into the price of a stock. If that is the case, the expected present value of a change in agency cost should be incorporated into the stock price shortly after any significant change in ownership. Hence, if the estimate is unbiased, the longer‐term performance of firms should not be effected by such changes. The issue is examined for both large, well‐known firms and for smaller, less‐known firms. The hypothesis that markets are generally efficient with respect to insider ownership information is rejected.
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