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Using detailed and unique data from Sweden, I show that former insiders trade profitably in the shares of companies with which they used to be affiliated. A trading strategy mimicking former insiders’ trading behavior yields abnormal returns of 7.6% per year. These returns are primarily driven by post-separation purchases rather than by sales. They do not reflect general stock-picking skills: former insiders earn significantly lower abnormal returns when trading in companies with which they have no affiliation. I show that former insiders’ informational advantage diminishes over time, but less so if they have ties to current insiders. The importance of such ties increases in the presence of value-relevant information. My results are consistent with former insiders benefiting from both a retained informational advantage and from inside information obtained post-separation when trading in inside stock.

The purposes of this thesis are threefold: (1) to investigate the incidence of insider trading in China; (2) to critically examine the regulation of insider trading in China within the Chinese context; and (3) to set out reform proposals. At present, insider trading is a very serious issue in China as it presents a major obstacle to the development of China???s securities market. This thesis is therefore of both theoretical and practical significance. Based on both theoretical arguments and empirical findings, this thesis investigates the extent of insider trading in China, explains why insider trading occurs in China, and examines the harmful and allegedly beneficial effects of insider trading. Insider trading is found to be widespread and widely considered to be harmful in China. This accounts for the fact that China has shown a great willingness to follow the international trend to regulate insider trading. Indeed, with the benefit of overseas experience, China has made a remarkable achievement in establishing its insider trading regulatory regime within a relatively short period of time. Despite this, there are a number of major problems with this regulatory regime, mainly due to the adoption of foreign ideas without due criticism. This is illustrated by various loopholes found in the definition of what is an ???insider???, which are related to confusion over underlying theories of insider trading liability. The thesis conducts an indepth analysis of these theories on a comparative law basis, recommending that the equality of access theory and the Australian ???information connection??? only approach are better suited to China. The thesis also examines other basic elements of insider trading, including the concept of materiality, the issue of when information becomes public, and the subjective elements of insider trading. Furthermore, a detailed discussion is carried out concerning the issue of private civil liability for insider trading. It is submitted that the combination of the nondisclosure-period-traders approach and well-designed damage caps can best ensure that private actions serve as a necessary and appropriate force in the enforcement of insider trading law.

published_or_final_version / Business / Master / Master of Philosophy

The purposes of this thesis are threefold: (1) to investigate the incidence of insider trading in China; (2) to critically examine the regulation of insider trading in China within the Chinese context; and (3) to set out reform proposals. At present, insider trading is a very serious issue in China as it presents a major obstacle to the development of China???s securities market. This thesis is therefore of both theoretical and practical significance. Based on both theoretical arguments and empirical findings, this thesis investigates the extent of insider trading in China, explains why insider trading occurs in China, and examines the harmful and allegedly beneficial effects of insider trading. Insider trading is found to be widespread and widely considered to be harmful in China. This accounts for the fact that China has shown a great willingness to follow the international trend to regulate insider trading. Indeed, with the benefit of overseas experience, China has made a remarkable achievement in establishing its insider trading regulatory regime within a relatively short period of time. Despite this, there are a number of major problems with this regulatory regime, mainly due to the adoption of foreign ideas without due criticism. This is illustrated by various loopholes found in the definition of what is an ???insider???, which are related to confusion over underlying theories of insider trading liability. The thesis conducts an indepth analysis of these theories on a comparative law basis, recommending that the equality of access theory and the Australian ???information connection??? only approach are better suited to China. The thesis also examines other basic elements of insider trading, including the concept of materiality, the issue of when information becomes public, and the subjective elements of insider trading. Furthermore, a detailed discussion is carried out concerning the issue of private civil liability for insider trading. It is submitted that the combination of the nondisclosure-period-traders approach and well-designed damage caps can best ensure that private actions serve as a necessary and appropriate force in the enforcement of insider trading law.

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Cheuk Man Yin. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2001. / Includes bibliographical references (leaves 87-94). / Abstracts in English and Chinese. / ABSTRACT --- p.i / ACKNOWLEDGEMENT --- p.iv / TABLE OF CONTENTS --- p.v / LIST OF TABLES --- p.viii / Chapter / Chapter I. --- INTRODUCTION --- p.1 / Chapter 1.1 --- Introduction --- p.1 / Chapter 1.2 --- Objectives --- p.5 / Chapter II. --- LITERATURE REVIEW --- p.7 / Chapter 2.1 --- Backgrounds --- p.7 / Chapter 2.1.1 --- Information Content and Predictability of Insider Trading --- p.7 / Chapter 2.1.2 --- "Market Efficiency, Market Liquidity and Insider Trading" --- p.9 / Chapter 2.2 --- Review of Insider Trading Literature --- p.11 / Chapter 2.2.1 --- Review of Studies on the U.S. Market --- p.11 / Chapter 2.2.2 --- Review of Studies on the European and Canadian Markets --- p.17 / Chapter 2.2.3 --- Review of Studies on the Emerging Stock Markets --- p.18 / Chapter III. --- INSIDER TRADING REGULATION IN HONG KONG --- p.20 / Chapter 3.1 --- Backgrounds: Arguments For and Against Insider Trading --- p.20 / Chapter 3.2 --- The Securities (Insider Dealing) Ordinance --- p.22 / Chapter 3.3 --- The Securities (Disclosure of Interests) Ordinance --- p.23 / Chapter IV. --- DATA AND METHODOLOGY --- p.27 / Chapter 4.1 --- Data --- p.27 / Chapter 4.2 --- Statistics on Insider Trading Samples --- p.33 / Chapter 4.2.1 --- Statistics on Entire Sample --- p.33 / Chapter 4.2.2 --- Statistics by Year of Transaction --- p.34 / Chapter 4.2.3 --- Statistics by Calendar Month of Transaction --- p.36 / Chapter 4.2.4 --- Statistics by Day of the Week of Transaction --- p.37 / Chapter 4.2.5 --- Statistics by Industry Classification of the Firm --- p.38 / Chapter 4.2.6 --- Statistics by Size of the Firm --- p.38 / Chapter 4.2.7 --- Statistics by Book-to-Market Ratio of the Firm --- p.39 / Chapter 4.2.8 --- Statistics by Price-Earnings Ratio of the Firm --- p.40 / Chapter 4.2.9 --- Statistics by Relative Trading Volume in Shares --- p.41 / Chapter 4.2.10 --- Statistics by Firm Size and Relative Trading Volume in Shares --- p.43 / Chapter 4.3 --- Methodology --- p.43 / Chapter 4.3.1 --- Measurement of Stock Price Performance for Insider Trading Events --- p.43 / Chapter 4.3.2 --- Aggregate Industry-wide Insider Trading Prior to Major Adjustment in the AOI Sectorial Index --- p.47 / Chapter V. --- EMPIRICAL RESULTS AND DISCUSSIONS --- p.51 / Chapter 5.1 --- Stock Price Performance Around Insider Trading Events: Abnormal Returns and Cumulative Abnormal Returns --- p.51 / Chapter 5.1.1 --- On the Entire Sample --- p.51 / Chapter 5.1.2 --- By Year of Transaction --- p.55 / Chapter 5.1.3 --- By Calendar Month of Transaction --- p.59 / Chapter 5.1.4 --- By Day of the Week of Transaction --- p.61 / Chapter 5.1.5 --- By Industry Classification of the Firm --- p.62 / Chapter 5.1.6 --- By Size of the Firm --- p.64 / Chapter 5.1.7 --- By Book-to-Market Ratio of the Firm --- p.66 / Chapter 5.1.8 --- By Price-Earnings Ratio of the Firm --- p.67 / Chapter 5.1.9 --- By Relative Trading Volume in Shares --- p.69 / Chapter 5.1.10 --- By Firm Size and Relative Trading Volume in Shares --- p.70 / Chapter 5.2 --- Aggregate Industry-wide Insider Trading Prior to Major Adjustment in the AOI Sectorial Index --- p.74 / Chapter 5.2.1 --- Finance Industry --- p.76 / Chapter 5.2.2 --- Utilities Industry --- p.77 / Chapter 5.2.3 --- Properties Industry --- p.78 / Chapter 5.2.4 --- Consolidated Enterprises Industry --- p.80 / Chapter 5.2.5 --- Industrials Industry --- p.81 / Chapter 5.2.6 --- Hotels Industry --- p.82 / Chapter VI. --- CONCLUDING REMARKS --- p.85 / BIBLIOGRAPHY --- p.87