The equity and efficiency of the Australian share market with respect to director trading

Abstract

Purpose

The purpose of this paper is to investigate the extent of directors breaching the reporting requirements of the Australian Stock Exchange (ASX) and the Corporations Act in Australia. Further, it seeks to assess whether directors in Australia achieve abnormal returns from trades in their own companies.

Design/methodology/approach

Using an event study approach on an Australian sample, abnormal returns for a range of situations were estimated.

Findings

A total of 13 (seven) per cent of own‐company directors trades do not meet the ASX (Corporations Act) requirement of reporting within five (14) business days. Directors do achieve abnormal returns through trading in shares of their own companies. Ignoring transaction costs, outsiders can achieve abnormal returns by imitating directors' trades. Analysis of returns to directors after they trade but before they announce the trade to the market shows that directors are making small but statistically significant returns that are not available to the market. Analysis of returns to directors subsequent to the ASX reporting requirement up to the day the trade is reported shows that directors are making small but statistically significant returns that should be available to the market.

Research limitations/implications

Future research should investigate the linkages between late reporting by directors and disadvantages to outside shareholders and the implementation of internal policies implemented to mitigate insider trading.

Practical implications

Market participants should remain vigilant regarding the potential for late/non‐reporting of directors' trades.

Originality/value

Uncovering breaches of reporting regulations are particularly important given that directors tend to purchase (sell) shares when the price is low (high), thereby achieving abnormal returns.

Citation

Uylangco, K., Easton, S. and Faff, R. (2010), "The equity and efficiency of the Australian share market with respect to director trading", Accounting Research Journal, Vol. 23 No. 1, pp. 5-19. https://doi.org/10.1108/10309611011060506