大盘震荡调整，关注A500ETF易方达（159361）、沪深300ETF易方达（510310）等产品投资价值

Market Overview - A-shares experienced a collective adjustment in the morning session, with total market turnover at 1.27 trillion yuan, nearly unchanged from the previous day [1] - The major indices showed varied performance: the CSI 300 index fell by 0.4%, the ChiNext index dropped by 1.6%, and the STAR 50 index decreased by 1.7%, while the Hang Seng China Enterprises Index rose by 0.6% [1] Sector Performance - Leading sectors included oil and gas extraction and services, insurance, brain-computer interfaces, and banking, which saw gains [1] - Underperforming sectors included photovoltaic equipment, cultivated diamonds, controllable nuclear fusion, phosphorus chemical industry, and batteries, which experienced declines [1] - In the Hong Kong market, the pharmaceutical sector showed strong gains, while most technology stocks retreated after initial highs [1] Index Specifics - The CSI 300 index consists of 300 large-cap stocks with a rolling P/E ratio of 14.3 times, down by 0.4% [3] - The CSI A500 index, covering 500 stocks, has a rolling P/E ratio of 16.8 times, down by 0.7% [3] - The ChiNext index, composed of 100 stocks, has a rolling P/E ratio of 40.5 times, down by 1.6% [4] - The STAR 50 index, featuring 50 stocks, reflects a significant focus on "hard technology" leaders [6] - The Hang Seng China Enterprises Index, tracking 50 large-cap Chinese companies listed in Hong Kong, has a rolling P/E ratio of 10.9 times, up by 0.6% [8]