Market Overview - On October 15, A-shares opened slightly higher, initially dipped into the red, and then quickly rebounded, with all three major indices turning positive by the time of reporting [2][3]. - The Shanghai Composite Index rose by 0.24%, the Shenzhen Component Index increased by 0.17%, and the ChiNext Index gained 0.09% [3]. Sector Performance - The retail, beauty care, building materials, and non-ferrous metals sectors saw collective gains, while e-commerce, cement manufacturing, and cybersecurity stocks were active [3][4]. - The defense sector underperformed, with stocks related to photolithography machines and photovoltaic inverters declining [3][5]. Notable Stocks - In the e-commerce sector, stocks like Pinduoduo and JD Health saw increases of 1.93% and 3.39%, respectively [4][6]. - The building materials sector experienced a surge, with Yao Pi Glass and Jianlang Hardware rising by 9.98% and 6.94%, respectively [10]. - In the non-ferrous metals sector, Shenghe Resources hit the daily limit with a 10% increase, while other gold-related stocks also performed well [8][9]. Software Sector Activity - The domestic software sector was active, with stocks like Jiuqi Software and Geer Software reaching their daily limits, increasing by 10.03% and 10% respectively [11][12]. - New Kai Lai's subsidiary launched two EDA design software products at the Bay Area Semiconductor Industry Expo, achieving a 30% performance improvement over industry benchmarks [12]. Defense and Photolithography Sector Decline - The defense and military sector saw significant declines, with North China Long Dragon dropping over 10% and several other stocks experiencing substantial losses [14][15]. - Photolithography-related stocks collectively fell, with companies like Xinlai Materials and Guolin Technology seeing declines of over 10% [16]. Company-Specific News - Ruiyi Group's stock hit the daily limit down, falling by 9.98% to 5.23 CNY per share after the company received a notice of investigation from the China Securities Regulatory Commission for suspected information disclosure violations [19][20].