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FinTech, Fractional Trading, and Order Book Dynamics: A Study of US Equities Markets

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  • Janhavi Shankar Tripathi

    (School of Business, St. Bonaventure University, St. Bonaventure, NY 14778, USA)

  • Erick W. Rengifo

    (Department of Economics, and the Center for International Policy Studies, Fordham University, New York, NY 10458, USA)

Abstract

This study investigates how the rise of commission-free FinTech platforms and the introduction of fractional trading (FT) have altered trading behavior and order book dynamics in the NASDAQ equity market. Leveraging high-frequency ITCH data from highly capitalized stocks—AAPL, AMZN, GOOG, and TSLA—we analyze market microstructure changes surrounding the implementation of FT. Our empirical findings show a statistically significant increase in price levels, average tick sizes, and price volatility in the post-FinTech-FT period, alongside elevated price impact factors (PIFs), indicating steeper and less liquid limit order books. These shifts reflect greater participation by non-professional investors with limited order placement precision, contributing to noisier price discovery and heightened intraday risk. The altered liquidity landscape and increased volatility raise important questions about the resilience and informational efficiency of modern equity markets under democratized access. Our findings contribute to the growing literature on retail trading and provide actionable insights for market regulators and exchanges evaluating the design and oversight of evolving trading mechanisms.

Suggested Citation

  • Janhavi Shankar Tripathi & Erick W. Rengifo, 2025. "FinTech, Fractional Trading, and Order Book Dynamics: A Study of US Equities Markets," FinTech, MDPI, vol. 4(2), pages 1-23, April.
    • Handle: RePEc:gam:jfinte:v:4:y:2025:i:2:p:16-:d:1642228
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    References listed on IDEAS

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    1. Tversky, Amos & Kahneman, Daniel, 1992. "Advances in Prospect Theory: Cumulative Representation of Uncertainty," Journal of Risk and Uncertainty, Springer, vol. 5(4), pages 297-323, October.
    2. Glosten, Lawrence R. & Milgrom, Paul R., 1985. "Bid, ask and transaction prices in a specialist market with heterogeneously informed traders," Journal of Financial Economics, Elsevier, vol. 14(1), pages 71-100, March.
    3. Glosten, Lawrence R, 1994. "Is the Electronic Open Limit Order Book Inevitable?," Journal of Finance, American Finance Association, vol. 49(4), pages 1127-1161, September.
    4. Berk, Jonathan B. & van Binsbergen, Jules H., 2025. "The impact of impact investing," Journal of Financial Economics, Elsevier, vol. 164(C).
    5. Daniel Kahneman & Amos Tversky, 2013. "Prospect Theory: An Analysis of Decision Under Risk," World Scientific Book Chapters, in: Leonard C MacLean & William T Ziemba (ed.), HANDBOOK OF THE FUNDAMENTALS OF FINANCIAL DECISION MAKING Part I, chapter 6, pages 99-127, World Scientific Publishing Co. Pte. Ltd..
    6. Kyle, Albert S, 1985. "Continuous Auctions and Insider Trading," Econometrica, Econometric Society, vol. 53(6), pages 1315-1335, November.
    7. Gempesaw, David & Henry, Joseph J. & Velthuis, Raisa, 2022. "Piecing together the extent of retail fractional trading," Global Finance Journal, Elsevier, vol. 54(C).
    Full references (including those not matched with items on IDEAS)

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