Group 1 - The ETF market opened with mixed performance on September 4, with the Mechanical ETF (516960) rising by 3.83% and the Medical Device ETF (562600) increasing by 3.38% [1] - The China A50 ETF by Bosera (561750) saw a rise of 2.78%, indicating positive investor sentiment in large-cap stocks [1] - Conversely, the S&P Oil & Gas ETFs (159518 and 513350) experienced declines of 2.34% and 2.24% respectively, reflecting potential challenges in the oil and gas sector [1] - The China Fortune 50 ETF (159371) also fell by 1.77%, suggesting a broader market pullback in certain sectors [1]

The provided content does not contain any specific quantitative models or factors, nor does it include their construction processes, formulas, evaluations, or backtesting results. The documents primarily focus on market performance, sector and concept index movements, market sentiment, capital flows, ETF premiums/discounts, block trading discounts, and institutional activities. These are descriptive analyses and do not involve quantitative modeling or factor analysis.