Group 1 - The automotive parts sector increased by 0.85% on September 2, with Sunny Optical Technology leading the gains [1] - The Shanghai Composite Index closed at 3858.13, down 0.45%, while the Shenzhen Component Index closed at 12553.84, down 2.14% [1] - Notable gainers in the automotive parts sector included Sunny Optical Technology, which rose by 21.14% to a closing price of 40.00, and other companies like Tsinghua Tongfang and Yisheng Precision, which saw increases of 17.62% and 15.01% respectively [1] Group 2 - The automotive parts sector experienced a net outflow of 1.81 billion yuan from institutional investors, while retail investors saw a net inflow of 1.977 billion yuan [2] - Major decliners included Sulian Co., which fell by 8.30% to a closing price of 42.99, and Hailian Jinhui, which dropped by 8.24% to 9.80 [2] - The trading volume for the automotive parts sector was significant, with Sunny Optical Technology achieving a transaction amount of 604 million yuan [1]