What Is a Short Position in Options?

A short position in options means you sold the contract rather than bought it — you opened the position with a Sell to Open order. Selling puts you on the obligation side of the trade: if the buyer of that contract decides to exercise, you must fulfil it, which means selling the underlying at the strike price on a short call, or buying it at the strike price on a short put. In exchange for taking on that obligation you receive the premium immediately, and it is yours to keep whatever happens next. That premium is also the ceiling on what you can make — the maximum profit on a short position is the premium collected, while the potential loss is far larger and, on a short call, not capped at all. Because Pluang's options are American-style, the buyer can exercise at any point before expiry, so a short position carries early assignment risk for as long as you leave it open.

What defines a short options position:

• You sold to open: a short position is created with a Sell to Open order. If you bought to open instead, you hold a long position and the mechanics below don't apply to you.
• Obligation, not right: the buyer holds the right to exercise; you hold the duty to perform. You have no say in whether or when the contract is exercised against you.
• Premium is received upfront and is the maximum profit: you collect it when the position opens, keep it regardless of outcome, and cannot earn more than it on the position.
• Losses can far exceed the premium: on a short put the loss is bounded by the strike falling to zero; on a naked short call there is no theoretical ceiling, because the underlying can keep rising.
• Early assignment risk: Pluang's options are American-style, so assignment can occur any time before expiry — not only on expiry day.
• How to exit: close a short position with a Buy to Close order. Once it is closed you can no longer be assigned on it.

Related questions:

Q: What is the difference between a short and a long position in options?
It comes down to which side of the contract you took. A long position means you bought the contract: you paid the premium and you hold the right to exercise, with your loss capped at the premium you paid. A short position means you sold the contract: you received the premium and you carry the obligation to perform if the buyer exercises, with profit capped at that premium and losses potentially much larger. Long is a right you can walk away from; short is a duty you cannot.

Q: How much can I lose on a short options position?
Considerably more than you received in premium, which is what makes short positions higher-risk than long ones. On a short put, your worst case is the underlying falling to zero while you are obliged to buy at the strike price. On a naked short call the exposure is theoretically unlimited, because the underlying's price can keep climbing while you are obliged to sell at the fixed strike. Only the premium you collected offsets that, and it is usually small relative to the potential loss.

Q: Do I keep the premium on a short position even if I'm assigned?
Yes. The premium is credited when you open the position and is never returned, whatever the outcome. But keeping it does not mean the trade made money — if you are assigned, you also have to fulfil the contract at the strike price, and that cost can be much greater than the premium. Treat the premium as a partial offset against your obligation, not as a profit you have already locked in.

Q: Can I close a short position before expiry?
Yes, and it is generally the way to control the risk. Submitting a Buy to Close order buys back the same contract you sold, ending the position and with it your obligation and any further assignment exposure. You can do this at any time while the market for that contract is open. If you leave the position open through expiry day, Pluang force-closes anything still outstanding roughly one hour before market close.