There are two ways to inquire: the first way is to inquire through the securities business department, and the securities company can find the account information of investors (with the ID card), and the second way is to inquire through the China Securities Clearing and Registration Company. The steps are as follows: firstly, log in to official website, a domestic securities settlement and registration company, and then query the account opening information to find the investor account information. At present, an investor can open three stock accounts (three Shanghai A accounts and multiple deep A accounts).

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The stock account is a passport for investors to enter the market. Only when they own it can they enter the market to buy and sell securities. Stock account is also called shareholder code card in Shenzhen.

1. Documents required for opening a stock account. Stock accounts can be divided into individual accounts and legal person accounts. Individual investors must hold their valid identity documents (usually ID cards) when opening an account. The information required for a legal person to open an account includes: valid legal person certification document (business license) and its copy; The certificate of the legal representative and his/her ID card, the power of attorney of the legal person and the ID card of the trustee. The stock accounts of Shanghai Stock Exchange are centrally managed by the securities registration companies affiliated to the exchange, and the specific account opening procedures are entrusted to relevant institutions. To open a stock account in Shenzhen Stock Exchange, you need to provide a designated bank passbook in addition to your ID card. Opening an account in Shenzhen is accepted by Shenzhen Securities Registration Company. A natural person or legal person may go through the account opening formalities at the securities registration institution where the selected securities operation institution is located.

2. Information needed to open a stock account. When opening a stock account, an individual investor shall provide detailed information about himself and his clients, including name, gender, ID number, home address, occupation, contact telephone number, etc. The legal person investor shall provide the legal person's address, telephone number, name, gender, written power of attorney, bank account and account number, postal code, legal representative and institutional nature of the authorized brokerage firm.

Three. Basic conditions for opening a stock account. According to the relevant provisions of the state, the following persons are not allowed to open stock accounts: (1) the relevant personnel in charge of securities affairs in the securities department; (2) the manager of the stock exchange. (3) Personnel directly related to stock issuance or trading in securities institutions; (4) The functionaries of the organs who have direct administrative subordination or management relationship with the issuer. 5. Other insiders related to stock issuance or trading. After handling the stock and securities account of Shanghai Stock Exchange, you need to handle the designated transaction, so that the account can be designated for trading in the securities company. Such designated transactions can be handled or cancelled at any time. After the stock account of Shenzhen Stock Exchange is opened, the entrusted transactions can only be handled in the designated securities institutions. If investors need to entrust other securities institutions, they must go through the formalities of transferring custody in advance. With the development of the securities market, the function of stock account is not limited to stocks, but has been extended to funds, stock warrants, paperless national debt and so on.