Core Viewpoint - The article highlights the performance of the stock market on September 18, with significant movements in various indices, particularly the ChiNext Index and the Sci-Tech 50 Index, indicating a recovery trend after an initial decline [1]. Group 1 - As of 10:14 AM, the ChiNext Index rebounded after previously dropping over 1.3%, while the Shanghai Composite Index rose by 0.41% and the Shenzhen Component Index increased by 0.35% [1]. - The Sci-Tech 50 Index saw a notable increase, rising over 3% at one point, with Zhongwei Company leading the gains, surging more than 10% [1]. - By 10:20 AM, the Sci-Tech 50 Index's gains expanded to over 4%, with Zhongwei Company increasing by more than 12%, and Haiguang Information rising over 8% [1].

新华财经北京9月17日电 （胡晨曦）科创50指数9月17日早间低开，随后探底回升，早盘一度涨约 1.5%，午后指数窄幅震荡，最终大幅收涨。至收盘时，科创50指数报1370.43点，涨幅0.91%，指数振幅 为2.94%，总成交额约922.3亿元。 9月17日，科创综指全日收涨0.94%，收于1638.71点，总成交额2515亿元。 从盘面来看，科创板589只个股涨多跌少，高价股、低价股均多数上涨。细分领域来看，半导体股、元 器件股表现强势，医疗保健股、生物制药股跌幅靠前。 经新华财经统计，9月17日，科创板589只个股平均涨幅0.94%，平均换手率3.44%，合计成交额2515亿 元，平均振幅为4.41%。 个股表现方面，兴图新科、利扬芯片、峰岹科技涨停，涨幅靠前；华纳药厂跌7.72%，跌幅居首。 成交额方面，中芯国际成交额178.6亿元，位居首位；ST帕瓦成交额982.8万元，位居末位。 换手率方面，中巨芯换手率为23.44%，位居首位；佰仁医疗换手率为0.25%，位居末位。 （文章来源：新华财经） ...

Group 1 - The core point of the news is the adjustment of the STAR 50 Index samples, where "Qi An Xin" is replaced by "Sheng Yi Electronics" [1] - The adjustment is expected to increase the turnover rate of the STAR 50 ETF and raise the requirements for timing in portfolio rebalancing [3] - The maximum weight of a single sample in the STAR 50 Index is capped at 10%, and the combined weight of the top five samples is limited to no more than 40% [3] Group 2 - The stock price of Cambrian has significantly increased since the third quarter, leading to its weight rising to around 15%, which will now be adjusted down to no more than 10% [3] - The combined weight of the top five samples, including Cambrian, SMIC, Haiguang Information, Lanke Technology, and Micro Technology, has also been reduced to no more than 40% [3] - This adjustment effectively mitigates the risk of excessive concentration of index weight in a few industries and companies [3]

Market Performance - The Sci-Tech 50 Index opened slightly lower on September 12, quickly rose by approximately 2.47%, then gradually narrowed its gains, closing at 1338.02 points with a rise of 0.90% and a total trading volume of about 115.8 billion yuan [1] - The Sci-Tech Comprehensive Index also opened slightly lower, significantly rose before fluctuating, and closed at 1607.12 points with a gain of 0.67%, total trading volume reached approximately 286.6 billion yuan, showing an increase compared to the previous trading day [1] - Nearly 60% of stocks on the Sci-Tech Board closed lower on the same day, with semiconductor stocks leading the gains influenced by the strong performance of Chip Origin Co., Ltd. [1] Weekly Performance - For the week from September 8 to September 12, the Sci-Tech 50 Index increased by 5.48%, while the Sci-Tech Comprehensive Index rose by 4.07%, with the latter reaching a new high for the phase [1] Stock Performance - Chip Origin Co., Ltd. and Jingzhida both hit the daily limit with a 20% increase, while Anbotong experienced the largest decline at 9.30% [2] - Cambrian's trading volume was the highest at 28.695 billion yuan, while *ST Guandian had the lowest trading volume at 688.10 million yuan [3] - Lianyun Technology had the highest turnover rate at 18.95%, while Longteng Optoelectronics had the lowest turnover rate at 0.22% [4]

相关ETF：科创50ETF588000 截至9月11日，科创50指数持仓寒武纪占比14.47%，为指数第一大持仓股票。 9月12日下午，寒武纪持续拉升，截至发稿上涨8.64%，股价重回1500元。 ...

Group 1 - The Sci-Tech Innovation 50 Index experienced a rapid increase of over 2% at the beginning of trading [1] - Among the constituent stocks, Chip Origin Technology surged over 16% [1] - Other notable performers included Cambricon Technologies and Baiwei Storage, both rising over 5% [1]

来源：上海证券报·中国证券网 上证报中国证券网讯 截至9月11日10时40分，科创50指数涨近2.5%。 数据来源：Choice 金融终端 ...

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每经AI快讯，9月11日，指数走强，科创50指数涨5.06%，沪指涨1.01%，深成指涨2.45%，算力硬件、 半导体等板块指数涨幅居前，沪深京三市超3100股上涨。 ...

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