Definition
An AI venture capital firm pools investors’ money and buys ownership stakes in young AI companies, hoping to profit as those startups grow or sell.
At a glance
- AI took 61% of all global venture capital in 2025, about $259 billion.[5]
- A handful of giant firms now steer most of that money.
- They keep backing the same three labs: OpenAI, Anthropic, and xAI.
- Checks are huge, often $500 million to $2 billion into a single lab.
The list
- Andreessen Horowitz (a16z) — Largest US firm, biggest AI portfolio; backs Anthropic, xAI, Databricks, Mistral. $90B+ managed. [1]
- Sequoia Capital — One of the most active AI investors; led rounds for OpenAI and xAI. ~$90B managed. [2]
- Lightspeed Venture Partners — AI-first mega-manager; led Anthropic’s round, backed Mistral. $9B fund in 2025. [3]
- Khosla Ventures — Earliest mover, first VC into OpenAI. ~$15B managed. [4]
- Accel — A top lead on the largest 2025 AI rounds. Among $5B in rounds led. [1]
How to read this
Rankings blend two things: how much money a firm controls and how active it is in AI. The names above are both large and clearly AI-focused. The real story is concentration: a short list of investors keeps funding the same short list of labs.
Bottom line
Knowing these five names tells you most of what you need about who is bankrolling the AI boom.