What is a strike price in options?
In one line: The strike price is the fixed price at which an option lets its owner buy (a call) or sell (a put) the shares.
A simple example
A stock trades at $50. Its options come with a menu of strike prices: $45, $50, $55 and more.
- A $55 Call option lets you buy at $55.
- A $45 Put option lets you sell at $45.
The strike stays the same for the life of the contract. Only the stock price and the option's price move.
In, at and out of the money
These 3 phrases describe where the stock is compared with the strike. With the stock at $50:
| Option | Strike | Status | Why |
|---|---|---|---|
| Call | $45 | In the money | Buying at $45 beats $50 |
| Call | $50 | At the money | Strike equals the price |
| Call | $55 | Out of the money | Buying at $55 is worse than $50 |
| Put | $55 | In the money | Selling at $55 beats $50 |
| Put | $45 | Out of the money | Selling at $45 is worse than $50 |
In-the-money options cost more, because they already have built-in value. Out-of-the-money options are cheaper, because the stock still has to move past the strike.
Why it matters
The strike you pick sets 2 things: how much you pay, and how far the stock must move for the option to be worth anything at expiry.
For a call buyer, break-even at expiry is the strike plus the premium. For a put buyer, it's the strike minus the premium. More in options trading basics.
A common mistake
Picking the cheapest strike because it's cheap. A far out-of-the-money call might cost $0.20, or $20 a contract. It feels like a small risk. But the stock needs a big move, fast, for it to be worth anything at expiry. Many of these expire worthless.
Cheap doesn't mean low risk. It often means a long shot.
Questions
Can the strike price change?
Not in normal trading. It's fixed when the contract is created. It can be adjusted in rare cases, like a stock split.
What is the best strike price for beginners?
There's no single best one. At-the-money strikes cost more than far ones but need a smaller move. Practice with paper trades before using real money.
What happens when the stock hits the strike price?
Nothing automatic. At expiry, an option exactly at the strike usually has no built-in value. Before expiry, it still has time value.
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