Hang Seng Index
The Hang Seng Index ("HSI") is one of the earliest stock market indexes in Hong Kong. Publicly launched on November 24, 1969, the HSI has become the most widely quoted indicator of the performance of the Hong Kong stock market.
The HSI is a broad-based, modified-free-float-adjusted market-capitalization-weighted index designed to reflect the performance of the overall Hong Kong stock market.
Futures and options on the Hang Seng Index (HKFE Hang Seng Index Futures) are offered on the Hong Kong Futures Exchange. In January 2009, The Commodity Futures Trading Commission approved Hong Kong Futures Exchange's mini futures contracts based on the Hang Seng Index (HSI) and the Hang Seng China Enterprises Index (HSCEI), for trade in the U.S.
The index will be expanded in 2021. Three companies will be added in June: Xinyi Solar Holdings Ltd., BYD Co. Ltd. and Country Garden Services Holdings, bringing the total number of companies in the index to 58 as of June 7. The benchmark is expected to have 80 companies by mid-2022 and eventually will have 100. Like the Chinese economy, the index has been transitioning from old-economy financials as newer companies in the information technology sector are added.
According to a Bloomberg report, 43% of the index’s weighting was in financials as of Dec. 4, versus 24% for the information technology sector, However, IT was the Hang Seng’s largest sector by market value at 35%, twice that of financials. 
- ↑ Hang Seng Indexes. Hang Seng Indexes.
- ↑ CFTC Staff Allows Hong Kong Futures Exchange Limited’s Mini Futures Contracts Based on the Hang Seng Index and the Hang Seng China Enterprises Index to be Offered and Sold in the United States. CFTC.
- ↑ Why Changes to Hong Kong’s Stock Index Are a Big Deal. Bloomberg.