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Options 101
Put-Call Parity
The invisible equation that keeps options priced honestly. You don't trade it — but it explains why prices behave.
NoVo Options Trading · 2026
Put-call parity is a fundamental relationship in options pricing: for the same strike and expiration, a call and a put are linked to the underlying and cash by a fixed equation. In plain terms — owning a call plus cash equals owning a put plus the stock. The two sides must cost the same.
Why it must hold
If the relationship broke — if a synthetic position built from puts and stock cost less than the equivalent call plus cash — arbitrageurs would instantly buy the cheap side and sell the expensive side for a risk-free profit, forcing the prices back into line. Parity holds because any deviation is free money that gets arbitraged away in seconds.
Synthetics
Parity is why "synthetic positions" exist: you can replicate a call using a put plus stock, or a put using a call plus a short stock position. This is how market makers hedge and how complex structures get decomposed. The building blocks are interchangeable because parity ties them together.
Put-call parity is the no-free-lunch rule of options — break it and the arbitrageurs eat the difference.
Why it matters to you
You won't trade parity directly, but it explains a lot: why calls and puts at the same strike move in lockstep, why skew is about implied volatility rather than a pricing error, and how market makers hedge exposure. Understanding parity turns options from a set of disconnected instruments into one coherent system.
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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.