A股三大指数先后转跌，机构：以我为主，围绕“十五五”战略性布局，重点关注AI产业链

Group 1 - The A-share market experienced a decline, with the Shanghai Composite Index falling below 4000 points, while sectors such as cross-strait integration, lithium battery electrolytes, copper-clad laminates, and circuit boards remained active [1] - The cloud computing 50 ETF (516630) saw an increase of over 0.5%, with leading stocks including Taxfriend Co., Ltd. (603171), Kingsoft Office, Yunsai Zhiliang (600602), and UFIDA Software (600588), among which Taxfriend Co., Ltd. hit the 10% daily limit [1] - According to Industrial Securities, the recent trade negotiations between China and the US and the strengthening expectations of Federal Reserve interest rate cuts suggest that the most disruptive overseas factors may be gradually subsiding [1] Group 2 - The focus on the AI industry chain includes global economic resonance, self-controllable and innovative industries, with particular attention to overseas computing power chains (optical modules, PCB), domestic computing chains (GPU, equipment materials, storage), and mid-to-downstream applications (Hong Kong internet, gaming, consumer electronics) [2] - The cloud computing 50 ETF (516630) tracks the cloud computing index (930851), which has a high AI computing power content, covering popular concepts such as optical modules, computing leasing, data centers, AI servers, and liquid cooling [2] - The cloud computing 50 ETF (516630) is noted for having the lowest total fee rate among ETFs tracking this index [2]