Why BillionToOne Plummeted 36%, Leading A Medtech Sell-Off

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10:52 AM ET 08/06/2026

Medical research stocks took a bath Thursday, led by BillionToOne's (BLLN) second-quarter report, featuring a widespread beat but no guidance raise. The company is a victim of its own success, said William Blair analyst Matt Larew. Up until the close on Wednesday, BillionToOne stock had climbed more than 84% since putting out its first-quarter report on May 6. "Both the…