Y Combinator Blogblog

BillionToOne Goes Public — The Startup That Made Genetic Testing Universal

Thursday, November 6, 2025Jared FriedmanView original
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.