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What is a strike price, for someone selling the option?
The strike price is the price you agree to deal at. Sell a put, and it's the price you'll buy 100 shares for. Sell a call, and it's the price you'll sell them for. Everything else follows from that choice.
The short answer
The Strike price is the fixed price in the contract. For a seller, it's the price of your promise:
- Sold a put at $45? You've agreed to buy 100 shares at $45 if assigned.
- Sold a call at $55? You've agreed to sell 100 shares at $55 if assigned.
The stock can be anywhere. The strike doesn't move. That's what makes it a promise and not a guess.
In, at, or out of the money, from the seller's seat
| Where the stock is | A sold $45 put is… | A sold $55 call is… | What it means for you |
|---|---|---|---|
| $50 | Out of the money | Out of the money | Nothing owed yet; the premium is melting in your favour |
| $45 / $55 | At the money | At the money | A coin flip on assignment |
| $40 | In the money (put) | — | You'd buy at $45 shares worth $40 |
| $60 | — | In the money (call) | You'd sell at $55 shares worth $60 |
Sellers usually start out of the money: a put below the price, a call above it. The stock has to move to make the promise bite.
What picking a strike changes
Three things move together. You can't improve one without paying in another.
| Strike | Premium you collect | Chance you're assigned | Price you'd deal at |
|---|---|---|---|
| Close to the stock price | Bigger | Higher | Close to today's price |
| Further away | Smaller | Lower | A real discount (put) or a real gain (call) |
| Far away | Tiny | Low | Rarely happens |
The chain shows the odds as Delta: a 0.30-delta strike is roughly a 30% chance of finishing in the money. See what delta means in simple terms.
One example (an illustration, not a trade idea)
A made-up stock, XYZ, trades at $50. Two sellers pick different put strikes, both 30 days out.
| Seller A: $48 put | Seller B: $42 put | |
|---|---|---|
| Premium collected | $1.50 = $150 | $0.40 = $40 |
| Cash set aside | $4,800 | $4,200 |
| XYZ ends at $50 | +$150 | +$40 |
| XYZ ends at $45 | Assigned at $48: −$300 + $150 = −$150 | Expires: +$40 |
| XYZ ends at $36 | Assigned at $48: −$1,200 + $150 = −$1,050 | Assigned at $42: −$600 + $40 = −$560 |
Seller A collected almost four times the premium and lost almost twice as much in the bad row. The strike was the whole difference. That is a math example, not a recommendation of either strike.
The one rule for sellers
Pick the strike as a price, not as a premium. Ask: would I buy this stock at $45 today? or would I sell my shares at $55 today? If yes, that's your strike. If you'd only do it for the premium, the strike is wrong.
In the wheel strategy, that rule has a second half: once you own shares, the call strike goes above your cost. A call struck below what you paid can turn a bounce into a locked-in loss.
Questions
Does the strike price change after I sell?
No. The strike is fixed for the life of the contract. The stock price moves around it. (A stock split adjusts contracts, but that's rare and handled by the options clearing house.)
Which strike should a beginner sell?
The one that matches a price you'd happily deal at. Many sellers start out of the money, around a 0.20 to 0.30 delta, but the price test comes first.
What happens if the stock lands exactly on my strike at expiry?
It's a coin flip whether the option is exercised. Some sellers close the position that afternoon to avoid the uncertainty. See pin risk explained.
Is a higher strike better for a put seller?
A higher put strike collects more and gets assigned more often, at a price closer to today's. It's not better or worse; it's a different trade with more share risk.
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