An analysis of trade-size clustering and its relation to stealth trading

Gordon J. Alexander, Mark A. Peterson

Research output: Contribution to journalArticlepeer-review

99 Scopus citations


NYSE and Nasdaq trades increasingly cluster on multiples of 500, 1,000, and 5,000 shares. Such clustering varies over time and across stocks, and tends to increase with the level of trading activity. Furthermore, rounded trades tend to have more persistence both in occurrence and in trade initiation. Finally, medium-sized rounded trades tend to have greater relative price impact than large rounded trades. From these observations we surmise that trade-size clustering is consistent, at least in part, with the actions of stealth traders who tend to use medium-sized rounded transactions in an attempt to disguise their trades.

Original languageEnglish (US)
Pages (from-to)435-471
Number of pages37
JournalJournal of Financial Economics
Issue number2
StatePublished - May 2007


  • Informed traders
  • Price impact
  • Stealth trading
  • Trade-size clustering


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