The proliferation of interconnectivity and interactivity through Internet-based technologies enables new forms of support for new product development. This paper analyzes idea markets, which use widely distributed knowledge, the power of markets, and the Internet to support the crucial initial tasks of the new product development process, including the sourcing, filtering, and evaluation of new product ideas. Idea markets employ virtual stocks to represent new product ideas and allow participants to suggest and trade new product ideas in a virtual marketplace. This paper empirically explores the performance of idea markets in a real-world field study at a large, high-tech business-to-business company that includes more than 500 participants from 17 countries and features various idea sourcing tasks. The results indicate that idea markets are a feasible and promising method to support the fuzzy front end of the new product development process. Idea markets offer a platform and formal process to capture, select, and distribute ideas in an organization, which motivates employees to communicate their ideas to management. By effectively sourcing and contemporaneously filtering, idea markets help reduce the number of ideas brought to management's attention to those that seem worthy of further consideration. Because idea markets also have the ability to source many ideas, they can increase efficiency at the fuzzy front end of the new product development process.