Simile Raises $200M Series B for Human Behavior Simulation

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Simile, a Palo Alto, California company building AI models that simulate human behavior, has raised more than $200 million in a Series B round at a $2 billion valuation. Greenoaks led the financing, which closed on July 31, 2026.

The raise landed just five months after Simile’s $100 million Series A. Index Ventures increased its stake, and Hanabi, Bain Capital Ventures, A*, Factory and CVS Health Ventures also returned, joined by new investor Definition.

Simile was founded by Stanford PhD graduate Joon Sung Park along with Michael Bernstein, Percy Liang and Lainie Yallen. Its foundation models are built to predict how people will act, and the company counts CVS Health, Wealthfront, Deloitte and Gallup among the organizations using them.

Since launching in February 2026, Simile has grown its revenue fivefold and expanded from a small group of researchers to more than 50 people worldwide. The company plans to use the new money to keep developing its human behavior model and scale its simulation platform.