Venture capital funding for U.S. start-ups hit its highest mark since 2001 during the first three months of the year and 11 companies were valued at $1 billion or more, underscoring the increasingly pricey environment for entrepreneurs, according to a report on Thursday from consultancy CB Insights. Venture capitalists invested $9.99 billion across 880 deals in the first quarter of 2014. The technology companies that venture capitalists valued at over $1 billion last quarter include payments company Stripe, online home-furnishings company Wayfair and enterprise-data management company Cloudera. The CB Insights report (click http://www.cbinsights.com/blog/trends/venture-capital-funding-exits-q1-2014) tracks deals only if venture capitalists were involved in the funding rounds, it said.