Silicon Valley receives about a third of all venture capital funding in the United States according to the National Venture Capital Association. The region is home to over 4,000 information technology companies that generate approximately $200 billion in annual IT-related revenue. Venture capital investment trends in Silicon Valley have shown resilience despite economic downturns. Mobile application development is also a major trend, with emerging business-to-business mobile applications and significant funding rounds for companies in the mobile space.