Identifying the Factors Affecting Post-Earnings-Announcement Drift

Document Type : Original Article

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Abstract

The purpose of this study is identifying the factors affecting post-earnings announcement drifts. Whether post-earnings-announcement drifts attributable, at least in part, to behavior distinct sets of investors (small and large traders) who use seasonal random-walk-based (RW) and analyst- forecast- based (AF) earnings surprises were examined. The study sample includes observations for 90 firms listed in Tehran Stock Exchange for the period 1385 to 1390 (Iranian Calendar). The results reveal that small traders systematically trade in the direction of RW earnings surprises after earnings announcements, whereas large traders’ trading during post-earnings-announcement period is in the direction of AF earnings surprises.

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