On September 4, Cambrian Innovation's (688256) share price experienced a steep decline of 14.45%, closing at 1202 yuan. This abrupt drop resulted in a market value evaporation of over 80 billion yuan within the day. This significant market movement may be attributed to the upcoming adjustment of the sample and weight within the STAR Market 50 Index. According to announcements made by the Shanghai Stock Exchange and China Securities Index Co., Ltd., a routine index adjustment is scheduled to take effect after market close on September 12. As of September 3's market close, Cambrian Innovation's weighting in the STAR Market 50 Index stood at a substantial 14.88%, surpassing the 10% weight limit imposed on individual stocks. Consequently, the company is anticipated to undergo a passive downward adjustment. This regulatory change could trigger corresponding adjustments in the positions of related ETF products, ultimately impacting Cambrian Innovation's share price.