“建仓” means starting or building a position. “满仓” means nearly all available investment capital is already invested. “补仓” means adding to an existing position. These are position-management words, not signals that a stock is safe.
| Term | Definition | Common mistake |
|---|---|---|
| 建仓 | Open a position, often in stages. | Buying before deciding maximum exposure. |
| 满仓 | Using almost all investable cash. | Confusing full position with “only one stock.” You can be full position across several holdings, or dangerously concentrated in one. |
| 补仓 | Add more after the first buy. | Thinking lower average cost means lower risk; total exposure increases. |
Cost averaging example
In this teaching example, transaction fees and taxes are excluded. You buy 100 shares at 10 yuan. Cost is 1,000 yuan. The price falls to 8 yuan, and you buy another 100 shares. Total cost is 1,800 yuan for 200 shares, so the average cost becomes 9 yuan:
Average cost = total cost ÷ total shares = 1,800 ÷ 200 = 9 yuan.
That looks better than 10 yuan, but your exposure rose from 1,000 yuan to 1,800 yuan. If the company’s fundamentals worsened, averaging down increased the size of the mistake.
Full position and concentration are different
Suppose you have 10,000 yuan. If all 10,000 is in one stock, you are both full-position and highly concentrated. If 10,000 is split across four funds, you may still be full-position. Concentration risk depends on their underlying holdings: four funds owning the same companies may provide little additional diversification. The FINRA asset allocation and diversification guide explains diversification and rebalancing as ways to manage risk, while the SEC asset allocation guide emphasizes matching investments to time horizon and risk tolerance.
Before building or adding a position, write three numbers: maximum amount in one stock, cash reserve that will not be used for investing, and the condition that would make you stop adding. Without those numbers, “建仓、满仓、补仓” are just chat-room labels.