Mainland-based firms with huge market capitalizations are to dominate the Hang Seng Index in the coming years. HSI Services, which manages the index, seems to favor using the existing market-capitalization-weighted method for consistency, according to the South China Morning Post. Some analysts say a cap should be put on large H-share blue chips so the index is not dominated by mainland banks. China Construction Bank, PetroChina, Sinopec, China Life Insurance and China Shenhua Energy are all in the frame for a place in the index. But HSI Services has not made a final decision on the index calculation method, and will continue to try to gauge market opinion.