ITM, ATM & OTM explained

An option is a contract with a fixed strike price — the price at which its owner has the right to buy (a call) or sell (a put) the underlying. Compare that strike to where the underlying actually trades right now, the spot price, and you get the contract's moneyness: ITM, ATM or OTM.

In the money (ITM)

The option would be worth something if it expired today. A call is ITM when spot is above the strike; a put is ITM when spot is below it. With BTC at $68,000, a $60,000 call is ITM by $8,000 — that gap is its intrinsic value, the blue ramp in the chart above. ITM options cost more, move almost one-for-one with the underlying and carry little time value.

At the money (ATM)

The strike sits closest to spot. Intrinsic value is roughly zero, so the premium is almost entirely time value — and the contract is a coin flip between expiring worthless and expiring in the money. That uncertainty is why ATM strikes are the most actively traded, the most sensitive to time and volatility, and where gamma peaks.

Out of the money (OTM)

The option would expire worthless today: a call with a strike above spot, or a put with a strike below it. Intrinsic value is zero — the flat stretch on the left of the chart — and the premium is pure time value. OTM contracts are cheap, which is exactly why they trade in size, and why big walls of OTM calls can matter so much.

Moneyness isn't just labelling. It sets an option's delta — near 1 deep ITM, around 0.5 ATM, near 0 far OTM — and therefore how much the underlying a dealer must hold to hedge it. That is where the next chapter picks up.