Shanghai Stock Exchange, with the code beginning with 600, stands for companies listed on the Shanghai Stock Exchange. Companies are often large state-owned enterprises with high market value, extensive business fields and relatively stable profitability and investment value. Investors can diversify their risks by buying these stocks and get a stable return on investment. SZ: Shenzhen Stock Exchange, with the code beginning with 000, representing companies listed on Shenzhen Stock Exchange. Companies are often representatives of small and medium-sized stocks and high-tech industries, with high growth and innovation.