大额买入与资金流向跟踪：（20251103-20251107）

• Tracking indicators and their calculation The report uses two indicators: the proportion of large buy order transaction amount and the proportion of net active buy transaction amount. The large buy order transaction amount proportion reflects the buying behavior of large funds. It is calculated by restoring transaction data into buy and sell orders based on transaction sequence numbers, filtering large orders by transaction volume, and computing the proportion of large buy order transaction amounts to the total daily transaction amount. The net active buy transaction amount proportion reflects investors' active buying behavior. It is calculated by identifying whether each transaction is an active buy or sell based on transaction markers, subtracting active sell amounts from active buy amounts, and computing the proportion of net active buy amounts to the total daily transaction amount[7] - Individual stock tracking The report provides rankings of stocks based on the 5-day average proportion of large buy order transaction amounts and net active buy transaction amounts. For example, the top-ranked stock for large buy order transaction amount proportion is "海陆重工" with a value of 93.0% and a time-series percentile of 100.0%. Similarly, the top-ranked stock for net active buy transaction amount proportion is "力聚热能" with a value of 21.2% and a time-series percentile of 100.0%[9][10] - Broad-based index tracking The report calculates the 5-day average proportions of large buy order transaction amounts and net active buy transaction amounts for major broad-based indices. For instance, the "上证指数" has a large buy order transaction amount proportion of 73.6% (percentile: 66.0%) and a net active buy transaction amount proportion of -4.1% (percentile: 99.6%)[11][12] - Sector tracking The report calculates the 5-day average proportions of large buy order transaction amounts and net active buy transaction amounts for various sectors. For example, the "石油石化" sector has a large buy order transaction amount proportion of 78.3% (percentile: 100.0%) and a net active buy transaction amount proportion of 5.0% (percentile: 27.0%)[13] - ETF tracking The report ranks ETFs based on the 5-day average proportions of large buy order transaction amounts and net active buy transaction amounts. For example, the top-ranked ETF for large buy order transaction amount proportion is "国泰上证 10 年期国债 ETF" with a value of 93.7% and a time-series percentile of 100.0%. Similarly, the top-ranked ETF for net active buy transaction amount proportion is "国泰上证 10 年期国债 ETF" with a value of 24.7% and a time-series percentile of 84.4%[15][16]