 Shares of 10x Genomics Inc. TGX, -4.32 plunged 22.3 in active morning trading Friday, putting them on track to suffer a record one-day drop to a record low Friday, after the biotechnology companys revenue warning prompted BofA Securities analyst Derik de Bruin to turn bearish. Trading volume was 3.9 million shares, already about triple the full-day average of about 1.3 million shares. 