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Know your customer: Informed trading by banks

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  • Haselmann, Rainer
  • Leuz, Christian
  • Schreiber, Sebastian

Abstract

This study analyzes information production and trading behavior of banks with lending relationships. We combine trade-by-trade supervisory data and credit-registry data to examine banks' proprietary trading in borrower stocks around a large number of corporate events. We find that relationship banks build up positive (negative) trading positions in the two weeks before events with positive (negative) news, even when these events are unscheduled, and unwind positions shortly after the event. This trading pattern is more pronounced in situations when banks are likely to possess private information about their borrowers, and cannot be explained by specialized expertise in certain industries or certain firms. The results suggest that banks' lending relationships inform their trading and underscore the potential for conflicts of interest in universal banking, which have been a prominent concern in the regulatory debate for a long time. Our analysis illustrates how combining large data sets can uncover unusual trading patterns and enhance the supervision of financial institutions.

Suggested Citation

  • Haselmann, Rainer & Leuz, Christian & Schreiber, Sebastian, 2022. "Know your customer: Informed trading by banks," CFS Working Paper Series 705, Center for Financial Studies (CFS).
    • Handle: RePEc:zbw:cfswop:285369
    DOI: 10.2139/ssrn.4365175
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    Cited by:

    1. Kang, Jung Koo, 2024. "Gone with the big data: Institutional lender demand for private information," Journal of Accounting and Economics, Elsevier, vol. 77(2).

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    More about this item

    Keywords

    Universal banks; bank regulation; big data; proprietary trading; Volcker Rule; insider trading; market supervision;
    All these keywords.

    JEL classification:

    • G01 - Financial Economics - - General - - - Financial Crises
    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading
    • G15 - Financial Economics - - General Financial Markets - - - International Financial Markets
    • G18 - Financial Economics - - General Financial Markets - - - Government Policy and Regulation
    • G21 - Financial Economics - - Financial Institutions and Services - - - Banks; Other Depository Institutions; Micro Finance Institutions; Mortgages
    • G24 - Financial Economics - - Financial Institutions and Services - - - Investment Banking; Venture Capital; Brokerage
    • G28 - Financial Economics - - Financial Institutions and Services - - - Government Policy and Regulation
    • G38 - Financial Economics - - Corporate Finance and Governance - - - Government Policy and Regulation
    • K22 - Law and Economics - - Regulation and Business Law - - - Business and Securities Law

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