BillionToOne Goes Public — The Startup That Made Genetic Testing Universal
Y Combinator Blog Jared Friedman November 6, 2025

Today, BillionToOne goes public, becoming YC's fourth publicly traded biotech company. More importantly, they have built one of the most important genetic tests in the U.S. Today, 1 in 11 babies born in the US are tested with BillionToOne's fetal genetic test.
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