I am building selling portfolio for option trading.

I can find buying call and put scenario but no scenario for selling and losing side.

For e.g. If buyer exercised put option, what happened on selling side of it? How much loss writer suffer ( including purchasing share and selling it to buyer).

Can anyone give me simple example.

3 Answers 3


The question you are asking concerns the exercise of a short option position. The other replies do not appear to address this situation.

Suppose that Apple is trading at $96 and you sell a put option with a strike price of $95 for some future delivery date - say August 2016. The option contract is for 100 shares and you sell the contract for a premium of $3.20.

When you sell the option your account will be credited with the premium and debited with the broker commission. The premium you receive will be $320 = 100 x $3.20. The commission you pay will depend on you broker.

Now suppose that the price of Apple drops to $90 and your option is exercised, either on expiry or prior to expiry. Then you would be obliged to take delivery of 100 Apple shares at the contracted option strike price of $95 costing you $9,500 plus broker commission. If you immediately sell the Apple shares you have purchased under your contract obligations, then assuming you sell the shares at the current market price of $90 you would realise a loss of $500 ( = 100x($95-$90) )plus commission. Since you received a premium of $320 when you sold the put option, your net loss would be $500-$320 = $180 plus any commissions paid to your broker.

Now let's look at the case of selling a call option. Again assume that the price of Apple is $96 and you sell a call option for 100 shares with a strike price of $97 for a premium of $3.60. The premium you receive would be $360 = 100 x $3.60. You would also be debited for commission by your broker.

Now suppose that the price of Apple shares rises to $101 and your option is exercised. Then you would be obliged to deliver 100 Apple shares to the party exercising the option at the contracted strike price of $97. If you did not own the shares to effect delivery, then you would need to purchase those shares in the market at the current market price of $101, and then sell them to the party exercising the option at the strike price of $97. This would realise an immediate loss of $400 = 100 x ($101-$97) plus any commission payable. If you did own the shares, then you would simply deliver them and possibly pay some commission or a delivery fee to your broker. Since you received $360 when you sold the option, your net loss would be $40 = $400-$360 plus any commission and fees payable to the broker.

It is important to understand that in addition to these accounting items, short option positions carry with them a "margin" requirement. You will need to maintain a margin deposit to show "good faith" so long as the short option position is open. If the option you have sold moves against you, then you will be called upon to put up extra margin to cover any potential losses.

  • Excellent this is the scenario I was looking for. Thank you @ NIck R
    – k31453
    Jul 5, 2016 at 22:34

Here's a simple example for a put, from both sides.

Assume XYZ stock trades at $200 right now. Let's say John writes a $190 out of the money put on XYZ stock and sells this put to Abby for the premium, which is say $5. Assume the strike date, or date of settlement, is 6 months from now.

Thus Abby is long one put option and John is short one put option (the writer of the option is short the option).

On settlement date, let's assume two different scenarios:

  1. The price of the stock dropped from $200 to $150
  2. The price of the stock rose from $200 to $250

(1) If the price of the stock decreases by $50, then the put that Abby bought is 'in the money'. Abby's profit can be calculated as being strike price 190 - current stock price 150 - premium paid 5 = $35 So not including any transaction fees, that is a $35 dollar return on a $5 investment.

(2) If the price of the stock increases by $50, then the put that Abby bought is worthless and her loss was 100%, or her entire $5 premium. For John, he made $5 in 6 months (in reality you need collateral and good credit to be able to write sizable option positions).

  • I was looking for answer which is below your post. But thank you
    – k31453
    Jul 5, 2016 at 22:36

To Illustrate the point.

See how you can only make the premium amount but your risk is the same as holding the stock when writing a put option.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.