This paper tests for the presence of post-earnings-announcement drift on the London Stock Exchange using data for seven half-years for a constant sample of 206 quoted companies. Separate results are presented for interim and final earnings announcements and the results are disaggregated by firm size. Overall, we find evidence of significant drift for the earnings announcements of small firms but not for the announcements of large firms.
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Hew et al. (1996) studied this question.
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