What Is a Strike Price? The Number That Defines Your Option
Every option has a strike price, and it's the first number you need to understand, because it defines exactly what the option lets you do and when it has value.
The strike price is the fixed price at which an option lets you buy (for a call) or sell (for a put) the underlying. It's the single most defining number on an option — it sets the reference point everything else is measured against.
How the strike works
A call with a $500 strike gives you the right to buy SPY at $500; a put with a $500 strike gives you the right to sell at $500. If SPY is above the call's strike (or below the put's), the option has real (“intrinsic”) value — it's in the money. If not, its value is all time and probability — out of the money. The strike is the line that divides those two states.
Why the strike choice matters
Which strike you pick shapes the trade entirely: strikes near the current price (higher delta) move closely with SPY and cost more; strikes far away (low delta) are cheap but need a big move to pay off (too far OTM is a common beginner trap). For scalping, strike selection is a real decision, and knowing which strikes dealers are positioned around is a large part of making it well.
The strike is the price your option is built around. Everything about what it's worth — and how it moves — starts from that one number.
The quick takeaway
The strike price defines what price your option is tied to. Combined with whether it's a call or put and the expiration, it fully specifies the contract. Understanding the strike is step one to reading an options quote and picking a trade — and it's the foundation for everything else in options.
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