AI Drove Over a Quarter of Global VC Funding in 2025, Bain Finds

By Nathan Brooks

Global venture funding hit roughly $141 billion in the fourth quarter of 2025, a 12% jump from the previous quarter, according to Bain's Quarterly Global Venture Capital Outlook. That surge made 2025 the highest-funded year since 2021. And one force did most of the pulling.

AI claimed more than a quarter of total global VC funding in 2025 — up from 15% in 2024 and just 7% in 2023, Bain reports. That's a near-quadrupling of AI's share of the market in two years. Put simply: for every four venture dollars deployed last year, more than one went to AI.

Where did the money land?

US funding climbed 13% quarter over quarter and kept the lion's share — 57% of the global total, per Bain. AI absorbed about half of all US venture funding in the fourth quarter alone. The money spread across infrastructure, model training platforms, and AI-native developer tools.

China gained meaningful momentum, powered by AI and autonomous vehicle rounds. Europe decelerated despite strength in sustainability and software. The UK stood apart from the Continent with a funding surge.

What does this change for founders raising now?

Stage dynamics shifted noticeably in the fourth quarter. Seed- and early-stage average deal sizes rose significantly, buoyed by multiple mega rounds, Bain found. Seed activity spiked from robotics, AI, semiconductors, and Web3. Early-stage dealmaking drew strength from AI, robotics, defense tech, and biotech — and came in above the $34 million overall average deal size.

Late-stage averages told a different story. They dipped modestly after Anthropic's $13 billion round in the third quarter — an outlier that skewed the comparison. Strip the distortion away, and late-stage checks are roughly holding.

Big Tech's quiet grip on the AI trade

Corporate venture capital stayed elevated in the fourth quarter, and Bain attributes much of that to Big Tech. In 2025, CVCs participated in 68% of overall AI deal value. That share got a tailwind from favorable AI policy signals and faster adoption timelines, according to Bain.

For founders, that figure matters. When nearly seven in ten AI dollars involve a corporate investor, strategic capital isn't a nice-to-have — it's the default structure of the market. It also means diligence, governance, and partner-selection criteria increasingly run through corporate playbooks.

Inside AI, the funding map

Within AI, horizontal enterprise applications raised the most funding and posted the highest deal count in the fourth quarter. Generative AI funding skyrocketed over 2025 as a whole, with larger deal sizes even as activity cooled late in the year.

Foundation models and large language models remained the single highest-funded category of 2025, Bain found. But core development tools also drew sustained investor focus — a signal that the picks-and-shovels layer of the AI stack still commands serious conviction.

The forward read for practitioners: if 2025's pattern holds, AI's share of global VC keeps compounding, corporate money keeps anchoring the biggest rounds, and the widest checks favor enterprise applications and foundational model builders. Founders outside those lanes will increasingly compete for a shrinking slice of the pie.