Diffusion Capital Partners

That's up from an $11 billion valuation just six months ago in March, when it raised $200 million.

Lightspeed Venture Partners co-led the round with Diffusion, a new firm co-founded by former CO2 management investor Chris Fredrickson.

Harvey's annual recurring revenue is now above $400 million, and its customer count has grown from roughly 1,300 organizations in March to more than 3,000 today.

Alongside the raise, Harvey announced its fourth acquisition of 2026, Guardrails AI, described as an AI security platform for agents.

It raised 550 million US, uh, last week at a $15.5 billion US valuation.

The round was led by Diffusion and Lightspeed Venture Partners.

This follows a $200 million round, uh, in March, so [laughs] six months ago at 11 billion, and a few months before that, an $8 billion va- valuation.

So it's gone from 8 billion in December to s- well, basically 16 billion now.

The legal AI startup that VCs can't get enough of has raised another $550 million in funding, this time at a $15.5 billion valuation.

The round was co-led by Diffusion and Lightspeed Venture Partners, and follows the previous $200 million round at an $11 billion valuation announced in March.

And that was just a few months after an $8 billion valuation from a round in December.

With this latest infusion of capital, the company has raised more than one and a half billion dollars total and nearly doubled its valuation in about nine months.