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A (Sub)penny for Your Thoughts: Tracking Retail Investor Activity in TAQ

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  • BRAD M. BARBER
  • XING HUANG
  • PHILIPPE JORION
  • TERRANCE ODEAN
  • CHRISTOPHER SCHWARZ

Abstract

We placed 85,000 retail trades in six retail brokerage accounts from December 2021 to June 2022 to validate the Boehmer et al. algorithm, which uses subpenny trade prices to identify and sign retail trades. The algorithm identifies 35% of our trades as retail, incorrectly signs 28% of identified trades, and yields uninformative order imbalance measures for 30% of stocks. We modify the algorithm by signing trades using the quoted spread midpoints. The quote midpoint method does not affect identification rates but reduces the signing error rates to 5% and provides informative order imbalance measures for all stocks.

Suggested Citation

  • Brad M. Barber & Xing Huang & Philippe Jorion & Terrance Odean & Christopher Schwarz, 2024. "A (Sub)penny for Your Thoughts: Tracking Retail Investor Activity in TAQ," Journal of Finance, American Finance Association, vol. 79(4), pages 2403-2427, August.
    • Handle: RePEc:bla:jfinan:v:79:y:2024:i:4:p:2403-2427
    DOI: 10.1111/jofi.13334
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