The cybersecurity community has talked about intelligence sharing for 30 years, but progress in actually sharing has been slow. While many factors have hindered threat intelligence sharing, lurking in the background for cybersecurity companies has been the suspicion that if you are sharing, you are degrading your competitive advantage. However, threat intelligence sharing enhances your competitive advantage rather than weakening it. First, no single company can detect every cyber threat to every target organization all of the time; this means that in order to understand the big picture, you need threat intelligence from multiple sources. Second, threat intelligence data can be useful by itself, but the real value for your customers comes from what you do with the data - which means that access to more diverse data and points of view is better. Third, no single company can impose significant costs on our adversaries, which means that if we want to disrupt the bad guys systemically, threat intelligence sharing is a critical enabler. The question then becomes: how do we make intelligence sharing a reality in the cybersecurity industry? This talk will provide real-world examples of sharing between competitors from our experience at the Cyber Threat Alliance and will illustrate these three points.