VivoSim Labs falls 5% in regular trading on heavy volumeUS Stock Market UpdateJul 21, 2026 at 11:41 AMVivoSim Labs(VIVS.US) 盘中跌超 5%,现报0.479 美元。该股在盘中交易时段出现短期波动信号,成交量显著放大至6089.90 万股。早间常规交易时段,该股曾出现成交量激增现象,当时股价波动幅度较小。