大盘五连涨！今年3次五连涨后发生了什么？

Market Overview - The A-share market saw all three major indices close in the green, with the Shanghai Composite Index rising by 0.07%, the Shenzhen Component Index by 0.27%, and the ChiNext Index by 0.41% [1] - The total trading volume in the Shanghai and Shenzhen markets reached 1.8998 trillion yuan, an increase of 37.9 billion yuan compared to the previous day [1] - Despite the index gains, the number of declining stocks (3,856) outnumbered advancing stocks (1,512), with a median decline of 0.80% for individual stocks [1] Technical Analysis - The Shanghai Composite Index faced resistance near the high point of 3,936 on December 8, which is considered a significant pressure level [1] - The current rebound has lasted for six trading days since December 16, which is shorter than the seven trading days observed in the previous rebound from November 14 to 24, indicating that the rebound cycle is not yet exhausted [1] - Historical patterns suggest that even if a short-term correction occurs, it is unlikely to be severe, with the mid-point of the current rebound serving as an important support level [1] Sector Performance - Core stocks in the optical module sector showed weakness today, experiencing a pullback after an initial rise [5] - The AI power sector, including lithium batteries, solid-state batteries, energy storage, and grid equipment, performed strongly, indicating a rotation among sectors [5] - The liquid cooling sector saw significant gains, with several stocks hitting the daily limit or rising over 10%, and the market capitalization of core stocks surpassing 100 billion yuan [11] PCB Industry Insights - The PCB upstream sector, including PCB equipment, fiberglass cloth, copper foil, and resin, showed notable price increases, with companies like Dongcai Technology and Dingtai High-Tech reaching historical highs [11] - The demand for PCBs is expected to grow due to the anticipated mass production of the Rubin architecture, which will enhance the value of PCB units [13] - The PCB industry is experiencing a continuous upward trend in demand, driven by AI-related infrastructure growth and the electrification/intelligentization of vehicles [13] Commercial Aerospace Sector - The commercial aerospace sector faced adjustments due to the unsuccessful recovery of the Long March 12 rocket's first stage, leading to significant declines in multiple stocks [15] - Historical context suggests that a major drop following a substantial rise can signal a sector retreat, as seen in previous instances [16] - Despite the current downturn, upcoming launches of reusable rockets may provide future catalysts for the sector [16] Summary - The market encountered resistance but the rebound cycle remains intact, suggesting a short-term consolidation phase [16] - Investors are advised to avoid chasing high prices and maintain a position of 30-50% in their portfolios, with a focus on core sectors like AI hardware [16]