Are you also getting dizzy from all those trading terms? Closing a position, positions that are still open, liquidation, rollover… These words may sound complicated, but understanding them isn’t actually that hard. Today I’ll break everything down for you so you can understand it all at once.

First, let’s talk about the two most core concepts: opening a position and closing a position. Simply put, opening a position means you start a trade—buying or selling an asset—hoping the price will move in your favor. But at this point, you haven’t truly made a profit or a loss yet—you’ve only established a position. Only when you close the position, meaning you fully exit that position, can you be sure whether you’re winning or losing.

Let’s take an example. I’m bullish on Apple stock, so I buy some AAPL. I can hold it, or increase or decrease my position when the price fluctuates. But as long as I’m still holding the stock, the position hasn’t been closed. When I’m satisfied with the price increase, or I no longer want to bear the risk of a drop, I sell all the stock—that’s called closing the position. Closing the position is the real moment when your profit and loss are confirmed. By the way, Taiwan stocks follow a T+2 settlement system. If you close your position by selling stocks today, the funds will only be credited two business days later, so you need to be especially careful when planning your cash.

So what is an open position? This mainly shows up in the futures and options markets. Open interest refers to the total number of contracts that haven’t yet been settled or offset through opposite transactions. It’s an important indicator for observing market depth and bullish/bearish momentum. An increase in open interest usually means new capital is continuously entering the market, suggesting the current trend may continue; a decrease in open interest indicates investors are closing positions, and the trend may be nearing its end. One thing to pay special attention to is this: if the Taiwan index futures price rises but open interest declines, it could be a warning sign—meaning this rally is mainly driven by short covering rather than new long positions entering, and the foundation of the rise may be unstable.

Liquidation is a risk unique to futures and leveraged trading. Because these trades require borrowing funds to amplify gains, you only need a small amount of margin to open a position. But if the market moves against you, losses can exceed your principal. At that point, the exchange will require you to add more margin. If you can’t cover it, the platform will forcibly close your position—this is liquidation. For example, if you go long on one small Taiwan index futures contract with an initial margin of 46,000 yuan, and the price moves downward in the opposite direction, causing your maintenance margin to fall below 35,000 yuan, you’ll receive a notice from your broker demanding additional funds. If you can’t top up the margin, the broker will liquidate your position at market price. Liquidation is extremely painful for investors—it can not only wipe out your principal, but also potentially leave you owing debts. So anyone using leverage must have risk management skills: set your stop-loss and take-profit points.

Rollover is a concept that exists only in futures trading. It means converting the contracts you hold into another contract with a different expiration date. Futures have fixed expiration dates—for example, the Taiwan index futures expire on the third Wednesday of every month. If you’re bullish on the long-term trend and don’t want to exit, you must roll over. Rollover involves costs, depending on whether there is contango or backwardation. In contango, the far-month price is higher than the near-month price, and rollover will incur costs. In backwardation, the far-month price is lower than the near-month price, and rollover may even be profitable. Many brokers offer automatic rollover services, but you need to understand their rules and costs. Manual rollover lets you choose the best timing yourself.

Now let’s get to the key point: when should you open a position? When should you close it?

Timing for opening a position is crucial. First, look at the overall market trend and confirm whether the weighted index is above the moving averages or in an upward structure. When the market is bullish, the chances of individual stocks yielding profits are higher; in a bearish market, try to open positions as little as possible. Second, look at the fundamentals of individual stocks. Watch for whether there is profit growth, revenue improvement, and industry support, and avoid stocks whose performance is deteriorating. Next, consider the technical side. Breakout-style opening (share price breaking above the consolidation range and previous highs, accompanied by a surge in trading volume) indicates buying interest, and you may consider following up. Most importantly, control risk. Before opening, set a stop-loss point in advance, confirm the range of losses you can tolerate, and then decide on your position size—don’t go all-in at once. In short, the key to opening a position is: “follow the bigger trend, choose individual stocks with support, have clear signals, and control risk first.”

The core principles for judging when to close a position are: follow the trend, protect your capital with stop-losses, and take profits without greed. When you reach your preset target, close in batches to avoid turning gains into losses. If the price breaks below your stop-loss line, close decisively—whether it’s a fixed-point stop-loss or a technical stop-loss. If fundamentals deteriorate, even if you haven’t hit your stop-loss point, you should prioritize closing the position to avoid a sharp drop in the stock price. When technical reversal signals appear—such as long black candlesticks, breaking below key moving averages, selloff days with a volume spike, or bearish divergence in indicators—these are warnings to close. If you find better investment targets or need to redeploy funds, you can also choose to close the weaker positions preferentially.

The biggest taboos when closing a position are greed and hesitation. You need to set rules based on your strategy, your risk tolerance, and market conditions, and then strictly follow them. Only then can you protect your profits and control your risk in investing. Taiwanese investors often say, “Stop-loss is the basic credit of investing,” and that’s absolutely true. Rather than getting stuck on the perfect entry price, it’s better to enter steadily, cut losses quickly, and even if it means missing opportunities, don’t buy impulsively. That’s the key to surviving in the market long-term.