Are you also often confused by words like "close position," "unclosed position," "liquidation," and "rollover"? I used to be too, until I realized they're not that complicated. Today, I want to talk to you about what these trading terms actually mean.

Let's start with the basics. "Closing a position" actually means ending your trading position, selling all the stocks, futures, or other assets you hold. Conversely, "opening a position" means starting a trade, buying or selling something. Simply put, opening a position is entering the market, closing a position is exiting, and the two are opposite concepts.

Let me give you an example. Suppose you are bullish on Apple stock AAPL and decide to buy some shares. As long as you hold these stocks, your position is in an "unclosed" state. At this point, you haven't yet determined whether you're making a profit or a loss; on paper, you might have unrealized gains or losses. But when Apple stock rises to a price you're satisfied with, and you decide to sell everything, that’s when you close the position, and your actual profit or loss is realized.

Regarding "unclosed position," this term is especially important in futures or options markets. The open interest is the total number of contracts that haven't been offset or settled. You can think of it as a market thermometer. An increase in open interest usually indicates that new funds are flowing in, and the current upward or downward trend may continue; conversely, a decrease in open interest suggests traders are closing their positions, and the trend might reverse soon. A detail worth noting: if the Taiwan index futures price rises but open interest declines, it could be a warning sign, because the rally might be driven by short covering rather than new long positions, indicating a weak foundation.

Next, let's talk about liquidation, which is the most dreaded event in futures trading. Liquidation often occurs when leverage is used. You only need to put up a small margin to trade a larger position, but if the market moves against you, losses can exceed your initial capital. When your account's losses reduce your margin below the maintenance margin, the broker will issue a margin call. If you cannot top up the margin within the deadline, the broker will forcibly liquidate your position at market price, which is liquidation. For example, if you go long on a small Taiwan futures contract with an initial margin of NT$46,000, but the market moves against you causing your account to lose and fall below the maintenance margin (say NT$35,000), you will be margin called. If you can't make up the difference, the broker will close your position at market, and the loss can be substantial. Therefore, leverage traders must set stop-loss points and manage risks carefully, or they might lose not only their principal but also incur debt.

Rollover is a concept unique to futures trading. Since futures contracts have fixed expiration dates (for example, Taiwan index futures expire on the third Wednesday of each month), if you are bullish on the long-term trend and don't want to exit, you need to roll over the expiring contract into the next month's contract. For example, if you bought December gold futures but later find that demand in December is weak, you can roll over into January futures to maintain your position. Rollover involves costs: if the longer-dated futures price is higher than the nearby month (contango), rolling over incurs a cost; if it's lower (backwardation), you might even gain. Many brokers offer automatic rollover services, but you should understand the rules. If you're only trading stocks or forex, rollover isn't relevant.

Now, let's discuss the most practical aspect: when to open a position and when to close it.

Before opening a position, check the overall environment. Confirm whether the weighted index is above its moving average or in an uptrend (higher highs and higher lows). When the market is bullish, the success rate of individual stock entries is higher. Also, examine the fundamentals of the stock—whether earnings are growing or supported by industry trends—to avoid stocks with declining performance. On the technical side, look for breakouts from consolidation patterns with increased volume, indicating buying interest. Supporting indicators like MACD bullish crossovers or RSI moving out of oversold zones can validate your judgment. Most importantly, set a stop-loss before entering, to define how much loss you're willing to tolerate, and avoid full position entry; diversify to manage risk.

The core principle for closing a position is "go with the trend, protect capital with stop-loss, and take profits without greed." When your predetermined profit target is reached, consider taking partial profits—e.g., sell 10% of your position to lock in gains and avoid giving back profits. If the price falls below your stop-loss level, exit decisively; Taiwanese investors often say "stop-loss is a basic skill," and don't rely on hope. If a stock reports worse-than-expected earnings or major negative news, close the position even if your stop-loss hasn't been hit. Technical reversal signals like long black candlesticks, breaking important moving averages, or volume spikes are also warning signs to exit.

Honestly, the idea of closing a position sounds simple, but executing it tests your psychological discipline and consistency. Many traders are easily swayed by greed or hesitation, holding on when they should exit, and ending up trapped. You need to set clear rules based on your strategy and risk tolerance, then strictly follow them. Only then can you preserve profits and control risks in your trading. Remember, the Taiwanese market favors a "steady entry, quick stop-loss" approach—it's better to miss some opportunities than to buy recklessly.