药捷安康股价过山车，ETF被动“抬轿”又“踩雷”！什么情况？

Core Viewpoint - The recent volatility in the stock price of the Hong Kong innovative drug company, Yaojie Ankang, has raised significant market attention, particularly due to its inclusion in multiple indices, leading to passive buying by related ETFs and subsequent investor backlash on social media [1][2]. Company Overview - Yaojie Ankang was listed on the Hong Kong stock market on June 23, 2025, focusing on discovering and developing small molecule innovative therapies for tumors, inflammation, and cardiovascular metabolic diseases [3]. - Since its listing, the stock price had been on a slight upward trend until its inclusion in the Hong Kong Stock Connect on September 8, which triggered a surge in buying activity [3]. Stock Price Movement - Following its inclusion in the indices, Yaojie Ankang's stock price saw a dramatic increase, with a 77.09% rise on September 12 and a staggering 115.58% increase by September 15 [3][4]. - However, on September 16, the stock experienced a sharp decline, dropping 53.73% from a peak of 679.5 HKD to 192 HKD, illustrating extreme volatility [3][4]. Index Inclusion and ETF Impact - The inclusion of Yaojie Ankang in the National Index of Hong Kong Innovative Drugs on September 15 led to significant passive buying, with one of the largest ETFs purchasing 3 million shares, amounting to approximately 578 million HKD, which represented about 2.62% of the fund's net value [4]. - The total scale of the five ETFs tracking this index is approximately 35.963 billion HKD, indicating a passive buying impact of around 940 million HKD [4]. Index Adjustment Controversy - The adjustment process for the National Index of Hong Kong Innovative Drugs has come under scrutiny due to a lack of prior announcement regarding Yaojie Ankang's inclusion, which left many investors unaware [8][9]. - The index's sample selection criteria have been criticized for potential loopholes, as Yaojie Ankang had been listed for less than three months and did not fully meet the requirement of having a significant trading volume [9]. Passive Investment Dynamics - The incident with Yaojie Ankang is not isolated, as the influence of ETFs on individual stock volatility has been noted, especially with the ETF market surpassing 5 trillion HKD in scale [10]. - The expansion of ETF holdings is believed to enhance market liquidity, but it also increases the potential for short-term price volatility due to passive fund inflows and outflows [12].