Strike Price, ITM, ATM, and OTM

The strike price is the fixed price in an option contract where the holder may buy (call) or sell (put) shares if they exercise. Moneyness is shorthand for how the current stock price compares to that strike.

Brokers color rows on the chain (ITM, ATM, OTM) because moneyness affects premium, delta, and how much of your payment is intrinsic versus extrinsic. None of these labels tell you whether a trade will win. They describe structure.

Calls: ITM, ATM, OTM

Assume the stock is $100.

Label	Call strike	Stock vs strike	Intrinsic at $100 spot
ITM	$95	Stock above strike	$5
ATM	$100	Near strike	$0
OTM	$105	Stock below strike	$0

• In the money (ITM) call: Stock price above strike. Has intrinsic value.
• At the money (ATM) call: Stock price near strike (often the closest strike).
• Out of the money (OTM) call: Stock price below strike. No intrinsic at expiry if still there.

Puts: ITM, ATM, OTM

Same $100 stock:

Label	Put strike	Stock vs strike	Intrinsic at $100 spot
ITM	$105	Stock below strike	$5
ATM	$100	Near strike	$0
OTM	$95	Stock above strike	$0

• ITM put: Stock below strike.
• ATM put: Stock near strike.
• OTM put: Stock above strike.

Calls and puts use opposite ITM/OTM rules. A $105 call is OTM at $100. A $105 put is ITM at $100.

Why moneyness matters for traders

Premium level: ITM options cost more because intrinsic is built in. OTM options look cheap but need a larger move.

Delta: ITM options usually have larger absolute delta (calls closer to +1, puts closer to −1). OTM options have smaller delta. Delta explained connects moneyness to directional sensitivity.

Theta as a percent: OTM options are often mostly extrinsic. A $0.50 tick down on a $1.00 OTM option is a 50% move. ITM options with large intrinsic can show slower percentage decay on the option price, though extrinsic still goes to zero at expiry.

Liquidity: ATM and near-ATM strikes often have tighter bid-ask spreads and more volume on popular names.

Intrinsic and extrinsic by moneyness

Premium = intrinsic + extrinsic.

At $100 stock, a $95 call priced at $7 might hold $5 intrinsic and $2 extrinsic. A $115 call at $1 might be all extrinsic. See Intrinsic vs extrinsic value.

Worked example 1: picking call strikes on a $100 stock

You are mildly bullish on XYZ at $100 for the next month.

• $100 call for $5: ATM, delta maybe 0.52, breakeven $105 at expiry.
• $105 call for $3: OTM, delta maybe 0.38, breakeven $108, needs a bigger rally.
• $95 call for $8: ITM, delta maybe 0.75, breakeven $103, more stock-like.

If XYZ finishes at $107:

• $100 call intrinsic $7, profit about $2 per share after $5 premium.
• $105 call intrinsic $2, loss of about $1 per share after $3 premium.
• $95 call intrinsic $12, profit about $4 per share after $8 premium.

Higher delta helped the ITM call when the move was moderate but not huge.

Worked example 2: put hedge strikes on $100 stock

You own shares at $100 and want a floor.

• $95 put for $2: OTM insurance, cheap, does not pay until stock below $93 breakeven at expiry (strike minus premium).
• $100 put for $4: ATM, more expensive, protection starts near $96 breakeven.
• $105 put for $7: ITM, costly, stronger protection now with $5 intrinsic at $100 spot.

A slow drift to $98 might barely help the $95 put before expiry but can help the $105 put because it starts ITM.

Reading moneyness on the chain

Open How to read an options chain. Strikes cluster around the stock. ITM calls sit below spot on many U.S. equity chains (lower strikes), ITM puts sit above spot (higher strikes). Layout varies by broker; focus on the definitions above, not screen position.

Tie-in to Greeks in ThetaViz

In Greeks in the builder, load a long call. Slide spot from $90 to $110 without changing strikes. Watch delta rise on the fixed $100 call as it moves from OTM to ITM.

Theta explained shows faster extrinsic burn on ATM options near expiry. Vega explained still applies: IV changes move all strikes, but OTM options can show wild percentage swings because premium is thin.

Parity intuition (same expiration)

At the same expiry, put-call parity ties calls and puts to the same stock price, strike, rates, and dividends. You do not need the formula to trade, but it explains why $100 call and $100 put at the same date rarely have identical premiums unless the stock sits exactly at $100 with symmetric inputs. Deep ITM call versus deep ITM put on opposite sides still follow the ITM/OTM labels above.

Rolling strikes without changing thesis

If the stock rallies through your call strike, your OTM call can become ATM or ITM. You are not locked into the old label. Some traders roll up strikes (sell old call, buy higher strike) to reset delta and breakeven. Any roll has new premium, theta, and vega; model the new legs in the builder before you execute.

Common mistakes

• Calling an OTM option "cheap" without comparing breakeven distance.
• Assuming ITM means "safe" (ITM long options can still lose if the stock moves the wrong way fast enough).
• Mixing up call vs put ITM rules on the chain.

Related guides

• Call options explained
• Put options explained
• Implied volatility basics

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ThetaViz provides educational tools only. This guide is not investment, tax, or legal advice. Prices, margin requirements, and tax rules change. Confirm details with your broker and qualified professionals before trading.