Among the different types of SSE-/SZSE-listed securities, only eligible A shares and ETFs are included in Shanghai and Shenzhen Connect. Other product types such as B shares, bonds, and other securities are not included.

For the list of eligible securities, please refer to HKEx website:

https://www.hkex.com.hk/mutual-market/stock-connect/eligible-stocks/view-all-eligible-securities?sc_lang=en

Northbound trading follows SSE's and SZSE's trading hours. Starting from five minutes before the morning session and afternoon seesion of the Mainland market, the Stock Exchange will accept Northbound orders from Exchange Participants. Southbound trading follows SEHK's trading hours.
 

SSE:

09:20 - 09:25: SSE will not accept order cancellation (for A shares and ETFs)

14:57 - 15:00: SSE will not accept order cancellation (for A shares)

09:10 - 09:15; 09:25 - 09:30; 12:55 - 13:00: Orders and order cancellations can be accepted by SEHK but will not be processed by SSE until SSE's market open

Orders that are not executed during the opening call auction session will automatically enter the continuous auction session. Any buy or sell orders not executed during the continuous auction session will automatically enter the closing call auction session.

SZSE:

09:20 - 09:25; 14:57 - 15:00: SZSE will not accept order cancellation (for A shares and ETFs)

09:10 - 09:15; 09:25 - 09:30; 12:55 - 13:00: Orders and order cancellations can be accepted by SEHK but will not be processed by SZSE until SZSE's market open

Any buy or sell orders not executed during the opening call auction session will automatically enter the continuous auction session. Any buy or sell orders not executed during the continuous auction session will automatically enter the closing call auction session.

Daily Quota Balance = Daily Quota - Buy Order + Sell Turnover + Adjustments* 

The Daily Quota is reset every day. Unused Daily Quota is NOT carried over to the following trading day's Daily Quota.

Once the Northbound Daily Quota Balance drops to zero or the Daily Quota is exceeded during a continuous auction session, no further buy orders will be accepted for the remainder of the day. HKEx will resume the Northbound buying service on the following trading day. 

*Daily Quota Balance will be increased in the following cases: a) Buy Order is canceled; b) Buy Order is rejected by the other exchange; or c) Buy Order is executed with a better price.

Investors are allowed to trade SSE and SZSE Securities on a Hong Kong business day when both the markets in Hong Kong and Mainland are open for trading.

The following table illustrates the holiday arrangement of Northbound trading of SSE/SZSE Securities:
 

If a Northbound trading day is a half trading day in the Hong Kong market, Northbound trading will continue until respective Connect Market is closed. Please refer to the HKEX website for the Northbound trading calendar for Shanghai Connect Northbound trading and Shenzhen Connect Northbound trading.

The above fees and taxes are collected in RMB and may be subject to changes after SFC's approval.

According to the Law of the PRC on Securities, when an investor holds or controls up to 5% of the issued A shares of a listed company, the investor is required to report in writing to the China Securities Regulatory Commission (CSRC) and the relevant exchange, and inform the listed company within three working days. The investor is not allowed to continue purchasing or selling shares of the listed company during the three days.

For such investor, every time a change in his / her shareholding reaches 5%, he /she is required to make disclosure (in the same manner as mentioned above) within three working days. From the day the disclosure obligation arises to two working days after the disclosure is made, the investor is not allowed to trade shares of the listed company.

If a change in shareholding of the investor is less than 5% but results in the shares held or controlled by him / her falling below 5% of the listed company, the investor is required to disclose the information within three working days.