An option seller (also called the writer) is a trader or investor who sells an option contract to another party (the option buyer) and receives the premium paid by the buyer. In return, the seller takes on the obligation to fulfil the contract if the buyer chooses to exercise the option before or on the expiry date.
The seller does not have the right to exercise the option but is bound by the obligation if the buyer decides to exercise
The risk for an option seller is potentially unlimited if the market moves significantly in the buyer’s favor
Key Characteristics of an Option Seller
Feature
Description
Receives Premium
Seller receives the premium from the option buyer
Obligation
Has the obligation to fulfil the contract if the option is exercised
Unlimited Risk
Risk can be unlimited (for Call Options) or large (for Put Options)
Limited Profit
Profit is limited to the premium received
Time Decay Advantage
Seller benefits from time decay as options lose value with time
Liquidity Provider
Sellers provide liquidity to the options market, allowing buyers to trade
Example: Option Seller in Action
A trader sells a NIFTY 22500 Call Option and receives a ₹100 premium
Detail
Value
Spot Price
₹22,300
Strike Price
₹22,500
Premium Received
₹100
Expiry
25-Apr-25
Option Type
Call
Break-even Point
₹22,600 (Strike + Premium)
If the market rises above ₹22,600, the seller will face unlimited losses as they must sell the underlying asset at the strike price
If the market stays below ₹22,500, the seller keeps the entire ₹100 premium as profit
Risk and Reward: Option Seller vs Option Buyer
Feature
Option Seller (Writer)
Option Buyer
Premium
Receives premium upfront
Pays premium upfront
Risk
Unlimited (for Calls) or large (for Puts)
Limited to the premium paid
Obligation
Must fulfill contract if exercised
No obligation to exercise
Profit
Limited to the premium received
Unlimited (Call) or limited (Put)
Strategy
Used for income generation via premium collection
Gains from directional market movement
Real-Life Analogy
Renting Out Property
Imagine you rent out your property (the option contract) and collect rent (premium)
If the renter (option buyer) chooses to move in (exercise), you must provide the property (fulfil the contract)
If they decide not to move in, you keep the rent as profit (premium)
Just like renting property, the seller collects the premium upfront, but if exercised, they must deliver the underlying asset.
Advantages for the Option Seller
Premium Income: The seller collects the premium upfront, which they keep regardless of outcome
Benefit from Time Decay: Out-of-the-money options lose value as expiry approaches, benefiting the seller
Liquidity: Sellers provide liquidity, making it easier for buyers to enter and exit positions
Key Takeaways
The option seller receives the premium from the buyer
The seller has the obligation to fulfil the contract if exercised
Seller’s risk is unlimited for Call options and significant for Put options
Profit is limited to the premium received
Seller benefits from time decay as options lose value near expiry