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Price revelation from insider trading: Evidence from hacked earnings news

Pat Akey, Vincent Grégoire and Charles Martineau

Journal of Financial Economics, 2022, vol. 143, issue 3, 1162-1184

Abstract: From 2010 to 2015, a group of traders illegally accessed earnings information before their public release by hacking several newswire services. We use this scheme as a natural experiment to investigate how informed investors select among private signals and how efficiently financial markets incorporate private information contained in trades into prices. We construct a measure of qualitative information using machine learning and find that the hackers traded on both qualitative and quantitative signals. The hackers’ trading caused 15% more of the earnings news to be incorporated in prices before their public release. Liquidity providers responded to the hackers’ trades by widening spreads.

Keywords: Cyber risks; Earnings announcements; Hard and soft information; Informed trading; Liquidity; Machine learning; Market microstructure; Price discovery (search for similar items in EconPapers)
JEL-codes: G10 G12 G14 (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1016/j.jfineco.2021.12.006

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