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Title: Caught On Tape: Institutional Trading, Stock Returns, and Earnings Announcements

Author(s): John Y Campbell, Tarun Ramadorai and Allie Schwartz

Publication Date: July 2007

Keyword(s): earnings announcements, institutions, liquidity, post-earnings-announcement-drift and trading

Programme Area(s): Financial Economics

Abstract: Many questions about institutional trading can only be answered if one can track high-frequency changes in institutional ownership. In the U.S., however, institutions are only required to report their ownership quarterly in 13-F filings. We infer daily institutional trading behaviour from the ?tape?, the Transactions and Quotes database of the New York Stock Exchange, using a sophisticated method that best matches quarterly 13-F data. We find that daily institutional trades are highly persistent and respond positively to recent daily returns but negatively to longer-term past daily returns. Institutional trades, particularly sells, appear to generate short-term losses - possibly reflecting institutional demand for liquidity - but longer-term profits. One source of these profits is that institutions anticipate both earnings surprises and post-earnings-announcement drift. These results are different from those obtained using a standard size cutoff rule for institutional trades.

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Bibliographic Reference

Campbell, J, Ramadorai, T and Schwartz, A. 2007. 'Caught On Tape: Institutional Trading, Stock Returns, and Earnings Announcements'. London, Centre for Economic Policy Research. https://cepr.org/active/publications/discussion_papers/dp.php?dpno=6390