Xin Lang Cai Jing·2025-09-19 00:37Group 1 - The core point of the article is the dramatic price fluctuation of the stock "药捷安康-B" after being included in the Hong Kong Stock Connect and index constituent stocks, leading to significant trading volume and volatility [1][3][12] - From September 8 to September 16, the stock price surged nearly 10 times, reaching a peak of 679.5 HKD, which is a 50-fold increase from its IPO price of 13.15 HKD [1][3] - On September 16, the stock experienced a massive drop of 53.73% after a peak increase of 63.73%, highlighting the volatility and risks associated with small-cap stocks in index funds [1][8] Group 2 - Prior to September 8, "药捷安康-B" was a typical small-cap stock with an average daily trading volume of only 16 million HKD, and it had incurred losses of 343 million CNY in 2023 [3][5] - After being included in the Hong Kong Stock Connect, the stock saw a significant influx of capital, with the number of shares held by the Hong Kong Stock Connect increasing from 96,000 to 409,950 shares by September 16, representing 74.67% of the actual circulating shares [5][6] - The stock's price increase was driven by passive funds that needed to adjust their holdings in response to its inclusion in the index, leading to a feedback loop of rising prices and increased demand [7][8] Group 3 - The article discusses the broader trend of index investing, which has gained popularity due to its low cost and transparency compared to active management, with the total net asset value of stock ETFs in Hong Kong reaching 3.53 trillion HKD by September 16 [12][13] - The rapid growth of index funds has been supported by the increasing difficulty for active funds to outperform the market, leading to a shift in investor preference towards ETFs [17][18] - The expansion of index funds is expected to enhance market pricing efficiency and reduce irrational volatility, although it may also lead to concentration in index-weighted stocks, impacting liquidity for other stocks [27][28]