We study the impact of Chief Executive Officer (CEO)’s IT knowledge on firm performance by leveraging the knowledge-based view and the influence of top management. We take an innova-tive approach by examining CEO’s conversation with financial analysts and investors in the earnings conference calls, which are considered as the biggest information event for listed com-panies. We measure CEO’s IT knowledge by counting the amount of IT discussions in the CEO’s answers to IT-related questions at the conference calls. The results show a positive relationship between CEO’s IT knowledge and firm performance. The findings will have clear and high con-tributions to the core IS literature of business value of IT by explicitly studying the role of top executives in IT success. \ \ Keywords: Chief Executive Officer, CEO, IT Knowledge, Knowledge-Based View, the Influence of Top Management, Firm Performance, Business Value of IT.