盘中涨超1%，沪指逼近4000点关口

Core Viewpoint - A-shares experienced a collective rise in the three major stock indices, with the Shanghai Composite Index approaching the 4000-point mark, indicating positive market sentiment and potential investment opportunities [1] Group 1: Market Performance - On October 27, the three major A-share indices opened higher, with the Shanghai Composite Index showing a significant upward trend, rising over 1% at one point [1] - As of the report, the Shanghai Composite Index increased by 0.79%, reaching 3981.71 points, while the Shenzhen Component Index and the ChiNext Index rose by 0.77% and 0.91%, closing at 13391.19 points and 3200.56 points respectively [1]