BillionToOne stock in focus before Monday open after Friday jump, JPMorgan conference next
NEW YORK, December 29, 2025, 05:02 ET — Premarket BillionToOne, Inc shares rose 3.4% to $89.30 at Friday’s close. The stock last traded at $89.40 in after-hours activity, trading that takes place after the regular session ends, according to Investing.com.