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Market Efficiency and Insider Trading: New Evidence

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Author Info
Rozeff, Michael S
Zaman, Mir A
Abstract

That corporate insiders earn profits from stock trading does not surprise most financial economists, but that outsiders can earn abnormal returns by using pub licly-available, insider-trading data constitutes a serious exception to stock-market efficiency. The authors show that this anomaly conti nues to exist despite the publication of studies attesting to its exi stence. They suggest that the anomalous profits to outsiders are a ma nifestation of the size and earnings/price ratio effects. Controlling for these factors reduces outsider profits by half: the additional a ssumption of a 2 percent transactions cost makes outsider profits zer o or negative. Insider profits, after an assumed 2 percent transactio ns cost, are a moderate 3 percent per annum for annual holding period s. Copyright 1988 by the University of Chicago.

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Publisher Info
Article provided by University of Chicago Press in its journal Journal of Business.

Volume (Year): 61 (1988)
Issue (Month): 1 (January)
Pages: 25-44
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Handle: RePEc:ucp:jnlbus:v:61:y:1988:i:1:p:25-44

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  1. Michael R. King & Maksym Padalko, 2005. "Pre-Bid Run-Ups Ahead of Canadian Takeovers: How Big Is the Problem?," Working Papers 05-3, Bank of Canada. [Downloadable!]
  2. Kyri Kyriacou & Bryan Mase, 2004. "Executive Stock Option Exercises and the Predictive Ability of Transaction Value," Public Policy Discussion Papers 04-09, Economics and Finance Section, School of Social Sciences, Brunel University. [Downloadable!]
  3. Kyri Kyriacou & Bryan Mase, 2004. "Executive Stock Option Exercises and the Predictive Ability of Transaction Value," Economics and Finance Discussion Papers 04-09, Economics and Finance Section, School of Social Sciences, Brunel University. [Downloadable!]
  4. KENT D. DANIEL & David Hirshleifer & AVANIDHAR SUBRAHMANYAM, 2004. "A Theory of Overconfidence, Self-Attribution, and Security Market Under- and Over-reactions," Finance 0412006, EconWPA. [Downloadable!]
  5. Enrichetta Ravina & Paola Sapienza, 2006. "What Do Independent Directors Know? Evidence from Their Trading," NBER Working Papers 12765, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
    Other versions:
  6. Fidrmuc, Jana & Goergen, Marc & Renneboog, L.D.R., 2005. "Insider trading, news releases and ownership concentration," Discussion Paper 97, Tilburg University, Center for Economic Research. [Downloadable!]
    Other versions:
  7. Leslie A. Jeng & Andrew Metrick & Richard Zeckhauser, . "Estimating the Returns to Insider Trading," Rodney L. White Center for Financial Research Working Papers 19-99, Wharton School Rodney L. White Center for Financial Research. [Downloadable!]
  8. Juha-Pekka Kallunki & Henrik Nilsson & Janne Peltoniemi, 2009. "Regulated and unregulated insider trading around earnings announcements," European Journal of Law and Economics, Springer, vol. 27(3), pages 285-308, June. [Downloadable!] (restricted)
  9. John S. Jordan, 1997. "Manager's opportunistic trading of their firms' shares: a case study of executives in the banking industry," Working Papers 97-4, Federal Reserve Bank of Boston. [Downloadable!]
  10. Kyriacos Kyriacou & Bryan Mase, 2003. "The Information Contained In The Exercise Of Executive Stock Options," Economics and Finance Discussion Papers 03-17, Economics and Finance Section, School of Social Sciences, Brunel University. [Downloadable!]
  11. Josef Lakonishok & Inmoo Lee, 1998. "Are Insiders' Trades Informative?," NBER Working Papers 6656, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  12. Michael Firth & T. Y. Leung & Oliver M. Rui, 2008. "Double Signals or Single Signal? An Investigation of Insider Trading Around Share Repurchases," Working Papers 222008, Hong Kong Institute for Monetary Research. [Downloadable!]
  13. Leslie A. Jeng & Andrew Metrick & Richard Zeckhauser, 1999. "The Profits to Insider Trading: A Performance-Evaluation Perspective," NBER Working Papers 6913, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
    Other versions:
  14. Andreas Zingg & Sebastian Lang & Daniela Wyttenbach, 2007. "Insider Trading in the Swiss Stock Market," Swiss Journal of Economics and Statistics (SJES), Swiss Society of Economics and Statistics (SSES), vol. 143(III), pages 331-362, September. [Downloadable!]
  15. John S. Jordan, 1997. "Insiders' assessments of the stock market's pricing of New England banks," New England Economic Review, Federal Reserve Bank of Boston, issue Jul, pages 3-16. [Downloadable!]
  16. YiLin Wu & Lee Cheng-Few, 2008. "Specification analysis of corporate equity financing decision: a conditional residual approach," Review of Quantitative Finance and Accounting, Springer, vol. 31(4), pages 395-423, November. [Downloadable!] (restricted)
  17. Kyriacos Kyriacou & Bryan Mase, 2003. "The Information Contained In The Exercise Of Executive Stock Options," Public Policy Discussion Papers 03-17, Economics and Finance Section, School of Social Sciences, Brunel University. [Downloadable!]
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