市场早盘横盘震荡，A500ETF易方达（159361）、沪深300ETF易方达（510310）等助力布局核心资产

Group 1 - The CSI 300 Index, composed of 300 stocks from the Shanghai and Shenzhen markets, experienced a decline of 0.1% at midday, with a rolling P/E ratio of 13.5 times [2] - The CSI A500 Index, which includes 500 securities from various industries, saw a decrease of 0.2% at midday, with a rolling P/E ratio of 15.7 times [2] - The ChiNext ETF, tracking the ChiNext Index, dropped by 1.7% at midday, with a rolling P/E ratio of 37.4 times, and over 55% of its composition is from strategic emerging industries such as power equipment, pharmaceuticals, and electronics [2] Group 2 - The STAR Market 50 ETF reported a decline of 0.7% at midday, with a rolling P/E ratio of 10.3 times [5]