寒武纪跌超12%，市值蒸发超700亿元

Group 1 - The core point of the article is that Cambrian Technology's stock has dropped over 12%, resulting in a market value loss of more than 70 billion yuan, following an adjustment in the index weight of the stock [1][4]. - Cambrian Technology's stock price has decreased from a peak of 1595.88 yuan, representing a decline of over 20% since it became the highest-priced stock, surpassing Kweichow Moutai on August 28 [4]. - The recent decline in Cambrian's stock is linked to an announcement by the Shanghai Stock Exchange regarding adjustments to the weight of Cambrian in the Sci-Tech 50 Index, which will decrease from approximately 15% to 10% [4][5]. Group 2 - Cambrian's half-year report indicates that funds related to the Sci-Tech 50 Index, such as the Huaxia and E Fund, are significant shareholders, collectively holding over 4.7% of the company's shares [5]. - On August 28, Cambrian issued a risk warning, stating that its stock price had increased by 133.86% from July 28 to August 28, significantly outpacing the growth of most peers and relevant indices, indicating a potential disconnect from its fundamental performance [5]. - The company anticipates a projected annual revenue of between 500 million yuan and 700 million yuan for 2025, although this is a preliminary forecast and does not constitute a commitment to investors [6].