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Industry familiarity and trading: Evidence from the personal portfolios of industry insiders

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  • Ben-David, Itzhak
  • Birru, Justin
  • Rossi, Andrea

Abstract

We study whether industry familiarity is an advantage in stock trading by exploring the trading patterns of industry insiders in their own personal portfolios. To do so, we identify accounts of industry insiders in a large data set provided by a retail discount broker. We find that insiders trade firms from their own industry more frequently. Furthermore, they earn abnormal returns exclusively when trading own-industry stocks, especially obscure stocks (small, low analyst coverage, high volatility). In a battery of tests, we find no evidence of the use of private information. The results are most consistent with the interpretation that industry familiarity is an advantage in stock trading.

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  • Ben-David, Itzhak & Birru, Justin & Rossi, Andrea, 2019. "Industry familiarity and trading: Evidence from the personal portfolios of industry insiders," Journal of Financial Economics, Elsevier, vol. 132(1), pages 49-75.
    • Handle: RePEc:eee:jfinec:v:132:y:2019:i:1:p:49-75
    DOI: 10.1016/j.jfineco.2018.08.007
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    More about this item

    Keywords

    Retail trading; Insiders; Officers and directors; Investor experience;
    All these keywords.

    JEL classification:

    • G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions
    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading

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