BillionToOne (BLLN) stock slides 4% in thin year-end trade as investors look to January catalysts
NEW YORK, December 31, 2025, 15:27 ET — Regular session. Shares of BillionToOne (BLLN.O) fell about 4% on Wednesday, sliding $3.49 to $81.61 in afternoon trading. The stock has traded between $81.25 and $89.36, with about 243,000 shares changing hands. The move came on the final trading day of 2025, when liquidity is typically thin and price swings can look bigger than the underlying news. “It’s perfectly fine in any bull market to have moments of cost,” said Giuseppe Sette, co-founder and president of Reflexivity, pointing to profit-taking when liquidity is low. U.S. markets are closed on Thursday for New