At the Money
An option whose strike is at or nearest to the current price of the underlying.
How it is identified
Test: Strike is equal to, or the listed strike closest to, the current Spot price
Unit
qualitative
In depth
At-the-money options carry the most time value in absolute terms and the highest gamma, which means their delta changes fastest as the underlying moves. They also decay fastest in the final days before expiry, since all their value is time value and there is a shrinking amount of time left. This combination makes them the most responsive contracts to both movement and the passage of time. The strict definition uses the forward price rather than the spot, which is why the true at-the-money strike sits slightly above spot for a non-dividend-paying underlying.
Worked example
With the index at 24,018, the 24,000 strike is the at-the-money contract. Its entire premium of 300 is time value, all of which is guaranteed to be zero by expiry unless the index moves.
Illustrative figures, chosen so the arithmetic is easy to follow. Not a live price and not a valuation of any company.
Educational reference only
This entry explains what “At the Money” means. It is not investment advice and not a recommendation to buy or sell any security. Any numbers above are illustrative, not live prices, and nothing here predicts price direction or rates a stock. Consider your own circumstances and consult a SEBI-registered investment adviser before acting.