1. None of the stocks starts with 5 19. 5 19 generally refers to funds. Shanghai Shenzhen Stock Exchange offers two kinds of open-end funds purchased with A-share accounts respectively. Shanghai is called Shanghai Stock Exchange, starting with 5 19. Shenzhen is called lof, starting with 16.
2. The number at the beginning of the fund means: 184 means Shenzhen Stock Exchange seal, and 500 means Shanghai Stock Exchange seal. Others mainly determine the top two according to fund companies.