Elias Reinfeldt is Co-Founder at Petrichor Bio, a wet lab built for AI that runs experiments at scale and returns clean training data to AI models.

Elias is a young founder who started the company with high school classmates Wilhelm Hedenskog and Jesper Johansson, all aged 19.

The team believes AI labs are becoming fabless in biology, designing experiments while someone else runs them, and Petrichor aims to be that foundry.

Petrichor Bio joined Y Combinator's Fall 2026 batch and operates from San Francisco with a three person founding team.

The company is building toward experiment scale no lab has attempted, recording every step so models can learn to do real science and help cure disease.