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Know Your Customer: Informed Trading by Banks

Author

Listed:
  • Rainer Haselmann
  • Christian Leuz
  • Sebastian Schreiber

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 when banks are likely to possess private information about their borrowers and cannot be explained by specialized expertise in certain industries or firms. The results suggest that banks' lending relationships inform their trading and underscore the potential for conflicts of interest in universal banking—a prominent concern in the regulatory debate for a long time. Our analysis also illustrates how combining large data sets can enhance the supervision of markets and financial institutions.

Suggested Citation

  • Rainer Haselmann & Christian Leuz & Sebastian Schreiber, 2022. "Know Your Customer: Informed Trading by Banks," NBER Working Papers 30521, National Bureau of Economic Research, Inc.
    • Handle: RePEc:nbr:nberwo:30521
    Note: CF LE
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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).
    2. Samuel K. Hughes & Joseph B. Nichols, 2025. "No News is Bad News: Monitoring, Risk, and Stale Financial Performance in Commercial Real Estate," Finance and Economics Discussion Series 2025-032, Board of Governors of the Federal Reserve System (U.S.).

    More about this item

    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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