BioStack

Product

BioStack connects fragmented clinical and preclinical data so AI labs can train and evaluate models on realistic medical workflows. It structures longitudinal information across medical imaging, electronic health records and experimental assays, then packages it for model post-training and reinforcement learning.

The San Francisco company was founded by CEO Sanat Mishra and CTO Parth Patwa and joined Y Combinator’s Spring 2026 batch. Its hospital-data network spans the United States, India, Brazil and Argentina, with access to more than 100 million de-identified patient records, according to the company.

BioStack serves AI developers and biotech researchers seeking data that connects clinical decisions with treatment histories and later outcomes. Its work combines provider-specific data workflows with datasets and training environments that reflect how research and care develop over time.