Investors need to buy at least 100 shares for stock investment, and 100 shares are first-class stocks. Secondly, the subsequent purchase of shares also needs to be an integer multiple of 100 shares. If you sell stocks, there is no specific requirement, and you don't need to sell them at an integer multiple of 100 shares. However, the investment threshold of science and technology innovation board in A-share market is different. The minimum trading unit of the science and technology innovation board is 200 shares, and every increase of more than 200 shares 1 share.
Stock is the abbreviation of stock certificate, which was put forward and used in15th century. Belonging to a kind of securities, it is a certificate issued by a joint-stock company to shareholders to prove its shares. The earliest stocks in the world were originally used to raise money for the voyages of Columbus and Magellan. 1608, the Netherlands established the world's earliest stock exchange, namely the Amsterdam Stock Exchange. Since the mid-1980s, joint-stock system and stock trading have become popular among the people of China. 1990, Shanghai Stock Exchange and Shenzhen Stock Exchange opened successively, and the prelude of China Stock Exchange was opened. There are many kinds of stocks, such as common stock, preferred stock and distributed stock. It has five characteristics: profitability, risk, liquidity, permanence and participation, and its distribution forms are divided into public offering and non-public offering.