On May 20, the U.S. stock market closed on Monday, the Dow index initially closed up 0.32%, the S & P 500 index rose 0.09%, and the Nasdaq index rose 0.02%. Tesla (TSLA. O) fell more than 2%, Apple (AAPL. O) fell 1%, Novavax Pharmaceutical (NVAX. O) rose 15%. Nasdaq China Golden Dragon Index closed down 0.17%, NIU (NIU. O) fell 12%, Bilibili (BILI. O) fell nearly 5%, and Zaiding Pharmaceutical (ZLAB. O) rose more than 6%.