Predominance of gains/losses in the stock market during pre/after-market hours


I have seen a number of posts and comments pertaining to how the gains and losses in the stock market have historically been made primarily during non-regular trading hours. There are some papers with complete analysis of this trend, so it is not just some random claim out there. What I am curious about is the reason why this trend commonly (based on my limited personal observations) carries a negative sentiment as being fishy or wrong. It is true that there are fewer market participants during non-regular hours but the majority of price moving news or announcements usually come out during these hours, so seeing such a pattern would totally make sense. Is there anything I am missing ? Thanks!


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