Group 1 - The definition of Hong Kong Stock Connect (港股通) allows mainland investors to trade specified Hong Kong-listed stocks through designated agencies using RMB [2] - As of June 30, 2025, there are 2,645 stocks available for trading under the Hong Kong Stock Connect [2] - The trading scope of Hong Kong Stock Connect is subject to strict inclusion and exclusion rules for eligible stocks and ETFs [3][5] Group 2 - The inclusion criteria for stocks in Hong Kong Stock Connect include being regulated by the Hong Kong Securities and Futures Commission and meeting specific market capitalization and listing duration requirements [6][7] - Stocks that are risk warning or under delisting procedures in their A-share counterparts are not included in the Hong Kong Stock Connect [6] - As of July 17, 2025, there are 567 eligible stocks under Hong Kong Stock Connect, with 17 being ETFs, covering 90.29% of the total market capitalization of Hong Kong stocks [8] Group 3 - The naming conventions for Hong Kong stocks differ from mainland stocks, with a maximum of eight characters allowed, including special indicators for voting rights and secondary listings [9] - Hong Kong stock codes consist of five digits, with those starting with "08" indicating growth enterprise market stocks [10][11]