市场震荡反弹，创业板指半日涨2.92%，全市场近4600只个股上涨

Market Overview - The market experienced a rebound in early trading on October 21, with the ChiNext Index rising over 3% during the session, and nearly 4,600 stocks in the market showing gains [1] - By the midday close, the Shanghai Composite Index increased by 1.2%, the Shenzhen Component Index rose by 1.97%, and the ChiNext Index was up by 2.92% [1] - The total trading volume in the Shanghai and Shenzhen markets reached 1.15 trillion yuan, a decrease of 11.5 billion yuan compared to the previous trading day [1] Index Performance - Shanghai Composite Index: 3,910.13, up 1.20%, with 1,911 gainers and 362 decliners [2] - Shenzhen Component Index: 13,065.58, up 1.97%, with 2,473 gainers and 387 decliners [2] - ChiNext Index: 3,080.79, up 2.92%, with 1,185 gainers and 190 decliners [2] - North Star 50 Index: 1,452.56, up 1.63%, with 257 gainers and 21 decliners [2] Sector Performance - Strong sectors included cultivated diamonds, CPO, and engineering machinery, while coal stocks faced declines [3] - Notable stocks included ShenKai Co. and Petrochemical Machinery, both achieving two consecutive trading limit increases, and several stocks in the computing hardware sector also performed strongly [2] - The Apple supply chain showed active performance, with companies like Huanxu Electronics hitting trading limits, and the storage chip sector saw significant gains, with Shannon Chip Innovation rising over 13% during the session [2]