The meaning of assignment

Lesson in Course: Derivatives and options (beginner, 5min)

We know options are contracts. What do we need to know when we're selling them?


What it's about: Assignment is the obligation that every buyer and seller of options agrees to.

Why it's important: Assignment can result in a loss or gain of money.

Key takeaway: Option sellers are assigned when the option buyers or holders choose to exercise.

The use of our credit card hinges on a contractual agreement that Visa or Mastercard will allow us to buy now and pay later. The agreement is that our creditors will pay for us when we make a purchase, and we promise to pay the creditors back within 30 days. 

Payment is bound by contractual terms

What if, instead of waiting the expected 30-days, the credit card company demands money from us at any time? This scenario describes how assignment works in the world of options trading.

Two sides of a contract

Exercising an option

The owner of the contract agreement can choose to force the agreement to be fulfilled at any time by exercising the option.

Exercising fulfills the contractual rights of an option

The biggest difference between a stock and an option is that the option represents the agreement or promise between two investors. For call options, the agreement is for one investor to buy stock from another. And for put options, the agreement is for an investor to sell stocks to another investor. 

The contract owner is the one that can choose to buy or sell the stock that the contract is converting. By doing so, that investor is exercising his or her rights to the contract and the other party is assigned.

What is Assignment ?

Assignment is the obligation to fulfill the full terms of an options contract.


 Let's walk through a quick example of how options can lead to an assignment. 

Options assignment between two friends

Tom wants to speculate on Tesla stock. The current price is $700 per share and he thinks that the stock price will increase over the next month. On the other hand, Valentina already owns Tesla stock ($TSLA) and doesn't think it will. In fact, she's been thinking about selling it.

Rather than selling her share outright, Valentina decides to sell a call option contract which gives the holder of the option the right to buy her share of $TSLA for $705 at any time over the next 30 days. Since Tom believes $TSLA will be worth more than that, he buys the contract from Valentina for $10 today. (An option contract typically covers 100 shares of the underlying. To keep this example simple, we're going to assume the contract between Valentina and Tom only covers 1 share.)

Now Tom has the right to buy Valentina's share of $TSLA for $705 at any time over the next 30 days. He thinks $TSLA will end up being at least $740 per share by the end of the month. If he's right, he would have spent $715 = $705 (for the share) + $10 (for the option) to own a share worth $740. That's a profit of $25 for him. If he's wrong, Valentina still gets to pocket the $10. They both shake on the deal.

  Tom buys a call option from Valentina

By buying the call option, Tom is taking a bet that the stock price will go up. He needs Tesla stock to be above $715 to make money.

  Valentina sells a call option to Tom

By selling the call option Valentina is taking a bet that the stock price won't move too much, or might go down. She gets paid $10 today and has to sell her shares to Tom for $705 if he decides to exercise the option.

Valentina sells a Tesla call contract to Tom
Example of assignment

Over the next two weeks, $TSLA jumps to $730 per share. 

Now, Tom would make $15 in profit if he were to exercise his right to buy Valentina's share of $TSLA for $705. By exercising, Valentina becomes assigned and will be required to sell her share, and then cancel the contract afterward.

Example of non-assignment

Let's say Tom gets greedy and decides to wait. He thinks $TSLA will continue upwards to $750 per share. 

Suddenly, a major investor in Tesla sells a big portion of their shares and the stock price drops down to $690. At this price, Tom would now lose money exercising the option. He would be spending a total of $715 to buy the share from Valentina when it's only worth $690. Tom chooses not to exercise in this case. The contract expires, and Valentina is not assigned.

Actionable ideas

In this lesson, we've broken down how assignment works on a very simple call option. In practice, options can have various terms and are rarely actually between two individual investors. Instead, market makers and clearinghouses often sit in the middle. Regardless of who is on the other end of our trade, as an investor selling options contracts, if we are assigned, we need to be prepared to fulfill our end of the bargain. If we don't understand what we're doing, we can quickly end up owing a lot of money.



What is Assignment ?

Assignment is the obligation for the counterparty to fulfill the full terms of an options contract when the holder chooses to exercise.