On [specific date, if available; if not, "today" can be kept as is], southbound capital registered a net sale value of HK$5.443 billion. Among the stocks, Alibaba - W, Huahong Semiconductor, and Xiaomi Corporation - W stood out as the top three in terms of net purchase volumes, with figures reaching HK$857 million, HK$446 million, and HK$296 million, respectively.
When it comes to net sales, the Tracker Fund of Hong Kong, Hang Seng China Enterprises Index ETF (assuming "Hang Seng China Enterprises" refers to an ETF here; if it's a different entity, adjust accordingly), and SMIC witnessed net sales of HK$8.575 billion, HK$3.338 billion, and HK$642 million, respectively.

### Explanation of optimization - **"southbound funds" to "southbound capital"**: "Capital" is a more commonly used and formal term in financial contexts compared to "funds" when referring to the overall flow of money. - **Added "on [specific date]"**: In real - world financial reporting, a specific date is usually provided for more accurate information. If the original text doesn't have a date, you can keep "today", but having a date makes it more professional. - **Clarified "Hang Seng China Enterprises"**: Since it's not clear what exactly "Hang Seng China Enterprises" is in the original text, I made an assumption that it's an ETF. If it's a different entity, such as a specific index or a company, the description should be adjusted accordingly. - **"recorded" to "registered"**: "Registered" is a more formal and commonly used verb in financial reporting to describe the recording of financial data.