A股 午后突变！

Market Overview - A-shares experienced a strong rise in early trading, with the Shanghai Composite Index approaching 4100 points, marking a new high in over 10 years, but later showed a slight decline in the afternoon [1] - The Shanghai Composite Index closed at 4085.77 points, up 0.05%, while the Shenzhen Component Index rose 0.06%, and the ChiNext Index increased by 0.31% [2] Sector Performance - The semiconductor sector showed strong performance, with stocks in the photolithography, memory chip, and advanced packaging segments collectively surging, leading to significant gains for companies like Chipone Technology and GigaDevice [5][7] - The coal sector also saw a strong rally, with companies like Dayou Energy and Shanxi Meimei rising by over 10% [3][8] - The rare earth sector experienced a notable increase, with companies such as Fangbang Co. and Zhongke Magnetic Materials rising over 12% and 7% respectively [11][13] Investment Insights - Analysts indicate that the semiconductor sector is benefiting from a price surge across the industry chain, sustained AI demand, and a strengthened domestic substitution logic, suggesting a structural market trend [7] - The coal market is expected to stabilize due to increased heating demand and supply constraints, with a positive outlook for high-quality coal companies in the next 3-5 years [9] - The rare earth market is anticipated to maintain stability, supported by pre-holiday stocking expectations and limited supply, which may bolster demand [13]