10 Mega-Rounds Captured 51% of Q1 2026 Startup Capital as AI Takes 57% of All Funding

AI companies made up 36.4% of all funded startups in Q1 2026 but captured 57% of $174.5 billion in disclosed capital, according to a Fundraise Insider report published via USA Today. The top 10 rounds alone, led by Anthropic at $30 billion, xAI at $20 billion, and Waymo at $16 billion, took 51.1% of all disclosed money.

The report analyzed 1,729 companies that raised funding between January 1 and March 31, 2026, across 105 industries. The median round was $10.7 million. That number is misleading: 1,372 companies outside the top 50 split less than a third of total capital.

AI Density Rises at Every Stage

AI’s dominance is not limited to late-stage mega-deals. AI companies accounted for 44.3% of pre-seed rounds, 46.4% of seed rounds, 53.5% of Series A, and 59.2% of Series B. AI startups are converting to follow-on rounds at higher rates than non-AI peers, according to the report.

The implication for agent-infrastructure founders is structural. With AI’s share of Series B approaching 60%, the follow-on bar is higher for any company without an AI thesis, regardless of revenue metrics.

The Barbell Market

Pre-seed through Series A produced 47.8% of named-stage deals but only 7.5% of capital, what Fundraise Insider calls “the clearest barbell in recent memory.” Early-stage deal volume remained strong throughout Q1, but capital allocation stayed heavily skewed toward the mega-round tier.

Debt financing added a separate layer: 171 deals totaling $35.1 billion at a $100 million median, concentrated in fintech, renewables, data centers, and real estate. That median exceeds Series C, suggesting debt has become a parallel capital market for capital-intensive infrastructure plays.

Geography and Cadence

California accounted for 28.9% of deals and 63.7% of capital. California, New York, and Texas together produced half of all funded companies. Deal flow held steady throughout the quarter, with 130 to 155 companies closing new funding every full week.

Median round benchmarks by stage remained consistent: seed at $4 million, Series A at $20 million, Series B at $50 million, Series C at $75 million.

Two Markets, One Number

Fundraise Insider’s central conclusion is that Q1’s headline figure is actually two economies stacked on top of each other. Strip out the six largest AI rounds and the quarter still produced roughly $95 billion across more than 1,400 companies, a normal and steady funding environment operating beneath a capital event of historic scale.

“Every week of the quarter, between 130 and 155 companies closed new funding, and the data shows most of their buying happens in the first 90 days after the round,” said Chris Walker, founder of Fundraise Insider, in the report.

For agent-infrastructure startups competing below the mega-round tier, the data suggests the capital is available but increasingly concentrated. The companies raising $10 million to $50 million are funded at a steady clip. The question is whether that clip holds as AI’s share of follow-on rounds continues to climb.