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Options 101
What Is Put-Call Parity?
Put-call parity is the invisible law that keeps calls and puts in line with each other. Break it, and arbitrageurs pounce.
NoVo Options Trading · 2026
Put-call parity is the fundamental relationship linking the prices of a call, a put, the underlying, and a bond at the same strike — enforced by arbitrage. It keeps option prices consistent.
What it says
Put-call parity states that a call and put at the same strike and expiration are related by a fixed formula involving the underlying price and the strike (discounted). In essence: owning a call and shorting a put (same strike) synthetically equals owning the stock (financed). If prices deviate from this relationship, a risk-free arbitrage exists.
Why it matters
Arbitrageurs enforce parity — if a call is too cheap relative to the put (and stock), they’ll buy the cheap side and sell the rich side risk-free, pushing prices back in line. So parity keeps calls, puts, and the underlying consistent. Deviations usually signal something real (like dividends, hard-to-borrow costs, or rates), not free money.
Put-call parity is the leash that keeps calls and puts tied to the stock. Stray from it and arbitrage yanks prices back — which is why it holds.
The takeaway
Put-call parity is the arbitrage-enforced relationship keeping call, put, and underlying prices consistent. It underpins synthetic positions and conversion/reversal arbitrage. For a scalper it’s deep background — but it’s why option prices “make sense” across calls and puts.
More on this: Calculating Break-Even on a Long Call or Put · Call and Put Walls on 0DTE vs Monthly Expiration
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NoVo is a software tool for market analysis and for executing trades you initiate, not financial advice. This article is general education, not investment advice. Options trading involves substantial risk of loss, up to and including your entire capital. NoVo makes no guarantee of profit, win rate, or performance, and past results do not predict future outcomes. You are responsible for your own broker account, configuration, and trading decisions.