BioStack, a San Francisco-based healthcare technology startup developing data infrastructure for medical AI, has raised $9.5 million in seed funding. The round was led by Peak XV, with participation from Afore Capital, DCVC, Emerson Collective, SV Angel, Verdict Capital, Streamlined Ventures and Y Combinator. The funding was announced on October 22, 2026.
Founded in 2025 by Sanat Mishra and Parth Patwa, BioStack builds infrastructure that helps healthcare organisations, biotechnology companies and AI developers work with fragmented clinical information. Mishra serves as CEO, while Patwa is the company’s CTO. The startup participated in Y Combinator’s Spring 2026 batch.
BioStack’s platform brings together clinical records from different healthcare systems, including medical notes, laboratory results, imaging, medications, treatment histories and patient outcomes. It organises this information into longitudinal patient records and creates de-identified datasets for medical research and AI model development.
The company said its healthcare data network spans the United States, India, Brazil and Argentina, providing access to more than 100 million de-identified patient records. These datasets are designed to support medical AI training and evaluation, drug development, disease modelling, biomarker discovery and analysis of treatment responses.
BioStack also develops data and simulation environments that allow AI developers to train and evaluate models using information drawn from real-world clinical workflows. Its infrastructure is intended to help researchers and developers study disease progression, clinical decisions and patient outcomes.
The company plans to use the seed funding to expand its operations across the United States and international markets, further develop its technology platform and grow its engineering and research teams.
