At-the-Money(ATM)
An at-the-money option has a strike price approximately equal to the current spot price of the underlying.
What At-the-Money Means
An option is at-the-money (ATM) when its strike price is closest to the current spot price of the underlying. Since exact equality is rare, the ATM strike is the listed strike nearest to spot. An ATM option has essentially zero intrinsic value — its premium is almost entirely time value.
ATM options sit at a balance point: Delta is near ±0.50, meaning roughly a coin-flip chance of finishing in-the-money.
Why ATM Options Are Special
ATM strikes carry the highest time value, the highest Gamma, and the largest Theta of any strike. That makes them the most actively traded and the most reactive to volatility. Sellers collect the most premium at the ATM but also take the most Gamma risk; buyers get the most responsive option but pay the steepest decay.
ATM in the Indian Market
With Nifty at 24,500 and 50-point strike spacing, the 24,500 strike is ATM. A short straddle is built by selling the ATM call and ATM put together, harvesting the peak time value. Near Thursday expiry, ATM Nifty and BankNifty options have explosive Gamma, so their premiums swing wildly on tiny index moves. Quintal Mind marks the live ATM strike across the chain in real time.
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