Launched on 24 November 1969, the HSI has just celebrated its 55th anniversary on the past Sunday, The Hang Seng Indexes Company issued a blog saying. Numerous constituents come and go over the past 55 years, as listed companies in Hong Kong have been going over merger & acquisitions, privatization amidst market competition. Related NewsBOCOMI Sees HK Stocks in Favorable Window w/ Tech Sector as Key DriverAmong the 33 constituents at the time of the HSI's launch in 1969, only 4 remain as HSI's constituents, namely CLP HOLDINGS (00002.HK) +0.100 (+0.151%) Short selling $17.79M; Ratio 12.095% , HK & CHINA GAS (00003.HK) +0.070 (+1.062%) Short selling $28.77M; Ratio 18.382% , HSBC HOLDINGS (00005.HK) +0.300 (+0.316%) Short selling $213.04M; Ratio 18.937% and POWER ASSETS (00006.HK) +0.300 (+0.595%) Short selling $27.79M; Ratio 22.434% .The HSI ended its first official trading day at 158.5, which increased to 20,317 on 31 October 2024r, representing a cumulative return of almost 127.2x since launch, the Hang Seng Indexes Company added.(HK stocks quote is delayed for at least 15 mins.Short Selling Data as at 2025-07-02 16:25.)