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Contents 1 Introduction 1£®1 Research Background 1£®2 Research Objective 1£®3 Organization of the Dissertation Literature Review 2£®1 The Relation Between the Return of Stock Price and Options Trading 2£®2 The Relation Between the Volatility of Stock Price and Options Trading 2£®3 The Information Content of Options Volume and PutCall Ratio 2£®4 The Informational Role of Various Investors 2£®5 The Information Content of Options Moneyness 2£®6 The Response of Options Volume to News Announcements 3 Hypothesis and Methodology 3£®1 The Relation Between Options Volume and the Volatility of KOSPI200 Index 3£®2 The Informational Role of Various Investors 3£®3 The Information Content of Options Moneyness 3£®4 The Response of Options Volume to News Announcements4 Dataset 4£®1 KOSPI200 Index Options 4£®2 Macroeconomic Variables 5 Empirical Analysis 5£®1 The Relation Between Options Volumes and the Volatility of KOSPI200 Index 5£®2 The Informational Role of Various Investors 5£®3 The Information Content of Options Moneyness 5£®4 Robustness Test 5£®5 The Response of Unexpected Options Volumes to News Announcements 6 ConclusionReference