Hang Seng Index 恒生指数
（重定向自Hang Seng Index Constituent Stock）
![Hang Seng Index 1969–2012](/Images/godic/202501/17/Hang_Seng_Index0038.png")
![2007年10月的恒生指数](/Images/godic/202501/17/HK_Central_QRC_Luk_Hoi_Tong_Bldg_n_Theatre_Lane_Hang_Seng_Index0038.JPG")
The Hang Seng Index (abbreviated: HSI, Chinese:恒生指數) is a freefloat-adjusted market capitalization-weighted stock market index in Hong Kong. It is used to record and monitor daily changes of the largest companies of the Hong Kong stock market and is the main indicator of the overall market performance in Hong Kong. These 50 constituent companies represent about 58% of the capitalisation of the Hong Kong Stock Exchange.