assignment

Assignment in options trading is the obligation of an options seller to fulfill the terms of the option contract when an options buyer chooses to exercise their right.

Assignment is a fundamental concept in options trading, representing the moment an option seller (writer) is legally bound to deliver or take delivery of the underlying asset at the strike price. It's the counterparty event to an options buyer's decision to exercise their contract. For call options, assignment means the seller must deliver the underlying shares. For put options, it means the seller must buy the underlying shares.

Understanding assignment is crucial for anyone involved in selling options, as it directly impacts their portfolio and capital. While buyers have the right to exercise, sellers bear the obligation. This obligation can arise at various times depending on the option type; American-style options can be exercised and thus assigned at any time before expiration, while European-style options can only be exercised at expiration. The potential for early assignment in American-style options introduces a unique layer of assignment risk that traders must manage.

Being assigned doesn't always imply a negative outcome, but it always means a change in position – from an option contract to the underlying asset, or to a cash settlement. Effective options trading strategies often involve calculating the probabilities of assignment and having plans in place to address it, whether through rolling positions, closing options before assignment, or being prepared to manage the underlying asset. It's a key mechanism that ensures the integrity and fulfillment of options contracts.

Why it matters

- Assignment converts an options position into a position in the underlying asset, impacting your portfolio.
It's a critical concept for options sellers, as it represents their primary obligation.
The timing of assignment varies by option style (American vs. European), affecting risk management.
Understanding assignment helps in managing risk and formulating effective options strategies.

Common mistakes

- Forgetting that selling options creates an obligation, not just potential premium income.
Underestimating the possibility of early assignment for American-style options.
Not having a plan for managing the underlying shares or cash required upon assignment.
Ignoring the potential tax implications of being assigned shares or cash.

FAQs

Who decides if an option is assigned?

The buyer of an option decides whether to exercise their option. If they do, the Options Clearing Corporation (OCC) then randomly assigns the obligation to an options seller.

Can I avoid assignment?

The most common way to avoid assignment is to close your short option position (buy back the option) before the buyer exercises it. For American-style options, this means before expiration; for European-style options, typically before expiration if they are in-the-money.

What happens if I'm assigned on a call option?

If you are assigned on a short call option, you are obligated to sell 100 shares of the underlying stock at the strike price. If you don't own the shares, you'll incur a short position.

What happens if I'm assigned on a put option?

If you are assigned on a short put option, you are obligated to buy 100 shares of the underlying stock at the strike price. This will result in you owning shares of the underlying company.