50 Years in PEAD Research

69 Pages Posted: 31 May 2019

Date Written: November 9, 2018


Analysing earning’s predictive power on stock returns was in the heart of academic research since late 60’s. First introduced to academic world in 1967 during seminar “Analysis of Security Prices” by Chicago University Professors Ray Ball and Philip Brown. In the next four decades was extensively analysed by many academics and is now a well-documented anomaly and is referred to as Post Earnings Announcement Drift (PEAD). This phenomenon is still at the centre of academic research because it stands at odds with efficient market hypothesis which assumes that all information is instantaneously reflected in stock prices. Professional investors are also closely looking at PEAD as it implies that it is easy to beat the market average by simply ranking stocks based on their earnings surprise and investing in the top decile, quintile or quartile and shorting the bottom part. Academic evidence shows that this strategy produces an abnormal return of somewhere between 2.6% and 9.37% per quarter, according to various authors.

In this paper I will present existing evidence supporting and contradicting “PEAD”, the history of academic research in that field and various techniques used to verify the phenomenon. The paper is organised as follows: first the history of the PEAD academic research is presented, in the second more recent evidence and research techniques used by authors are presented and finally conclusions and various critics of PEAD are shown.

Keywords: PEAD, Post Earnings Announcement Drift, Anomalies, Market Efficiency

JEL Classification: G14, G15, M41

Suggested Citation

Sojka, Marek, 50 Years in PEAD Research (November 9, 2018). Available at SSRN: https://ssrn.com/abstract=3281679 or http://dx.doi.org/10.2139/ssrn.3281679

Marek Sojka (Contact Author)

Bonum Quant Research ( email )

Oxford, Oxfordshire
United Kingdom

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