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