The Hang Seng Index will change how it calculates the weight of its constituents in the biggest reform in its 37-year history. The changes will kick in after the market closes June 30 and will take into account the growing importance of mainland companies in Hong Kong's stock exchange. The South China Morning Post said the index is likely to adopt a free-float, market-weighted method with a cap on each stock and take into account shares available for trading, while excluding shares held by a company, directors, strategic investors or affiliates. China Construction Bank, the first big state-owned lender to list in Hong Kong, is expected to be the first H-share to join the blue-chip index.
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