PitchBook: US Venture Funding Surges to Record 67B as OpenAI, Anthropic, and xAI Dominate AI Deals
US venture funding shattered records in the first quarter of 2026, surging to $267 billion as investors poured capital into AI infrastructure at an unprecedented pace. Nearly 90 percent of all VC cash raised by US startups went to just five Bay Area companies, with OpenAI, Anthropic, and xAI dominating deal flow. Mega-rounds continue to define the AI race, with frontier labs collectively raising hundreds of billions to build out compute capacity, data pipelines, and model capabilities. xAI alone is burning through approximately $1 billion per month, a figure that underscores both the capital intensity of foundation model development and the confidence investors have placed in Musk's AI venture.
The concentration is stark: while the broader startup ecosystem competes for a shrinking slice of available capital, AI's top players are raising amounts that would have been unthinkable a few years ago. The $20 billion xAI secured in its Series E round in early 2026 was one of the largest single raises in venture history, and its burn rate suggests the company is in a full sprint toward Grok 5 and expanded infrastructure. Critics point to the sustainability of billion-dollar monthly burns, but backers appear willing to fund the buildout until the economics of deployed AI at scale become clear.