300502、300308，盘中创新高

Market Overview - A-shares opened higher with all three major indices rising: Shanghai Composite Index up 0.48%, Shenzhen Component Index up 1.2%, and ChiNext Index up 1.75% [1] - As of the report, Shanghai Composite Index increased by 0.87% to 3984.67 points, Shenzhen Component Index rose by 1.23% to 13452.37 points, and ChiNext Index gained 1.59% to 3221.87 points [1] - The total trading volume in Shanghai, Shenzhen, and Beijing exceeded 1 trillion yuan, an increase of 246.7 billion yuan compared to the previous trading day, with over 2800 stocks rising across the market [1] Sector Performance - Key sectors with significant gains included electronic chemicals, minor metals, co-packaged optics (CPO), photolithography machines, and storage chips [3] - The electronic chemicals sector led with a rise of 3.11%, followed by minor metals at 3.04%, and co-packaged optics (CPO) at 2.26% [4] Notable Stocks - New Yisheng (300502) reached a historical high with a price increase of 9.52% to 408.47 yuan per share and a trading volume exceeding 13 billion yuan, with a total market capitalization surpassing 400 billion yuan [5] - Zhongji Xuchuang (300308) also saw its stock price break the 500 yuan mark for the first time, rising 4.15% to 514.49 yuan per share with a trading volume over 10 billion yuan [5] - Zhihua Technology, a commercial aerospace concept stock, hit the daily limit with a price of 53.74 yuan per share [5] Leading Stocks - Notable stocks that reached their daily limit included China First Heavy Industries and China Western Power, both hitting the limit up [6] - China Nuclear Engineering and China Electric Research also experienced significant gains, contributing to the upward trend in the market [6]