Opening a Position
Opening a position means entering a new trade, either buy to open or sell to open. Learn the four ways to open and what each one commits you to.
Opening a position means entering a new trade that creates exposure you did not have before. With options you open in one of two ways: buy to open, when you are becoming a buyer, or sell to open, when you are becoming a seller. The choice sets everything that follows.
The order ticket asks you to pick, and knowing the difference is the first step to trading options cleanly. Let me lay it out.
Buy to Open vs Sell to Open
Every options trade starts by deciding which side you are taking. That is what "to open" makes explicit.
Buy to open means you are purchasing an option to start a new long position. You pay the premium and gain the right the option carries, becoming its owner. Your risk is capped at what you paid.
Sell to open means you are selling an option to start a new short position. You collect the premium and take on the obligation the option carries, becoming responsible for delivering if you are assigned. Your risk depends on whether the position is covered.
The Four Ways to Open
Combine the two actions with calls and puts, and there are four ways to open a single-option position, each expressing a different view.
Buy to open a call. A bullish bet with capped risk; this is a long call.
Buy to open a put. A bearish bet with capped risk; a long put.
Sell to open a call. An obligation to deliver shares if assigned; a short call, safe when covered, dangerous when naked.
Sell to open a put. An obligation to buy shares if assigned; a short put, the basis of a cash-secured put.
Multi-leg trades like spreads simply open several of these at once, some bought and some sold, combined into one position.
What Opening Commits You To
Opening a position is a commitment, and knowing what you signed up for matters before you click.
If you bought to open, you paid premium and now hold the right. You can later sell to close for whatever the option is worth, and your loss is capped at the premium. Time decay works against you.
If you sold to open, you collected premium and now carry the obligation. You may face assignment while the position is open, you may need margin as collateral, and your risk can be large if the trade is uncovered. Time decay works for you.
The habit to build is thinking one step ahead: every position you open is one you will eventually need to close or let expire. Opening is only the first half of the round trip.
- Opening a position creates new exposure, buy to open or sell to open.
- Buy to open makes you the owner; sell to open makes you the seller.
- There are four ways to open with a single call or put.
- Sellers take on obligation and margin; buyers pay premium with capped risk.
Pop Quiz
Three quick questions to see what stuck. Pick an answer and the explanation shows up right away.
What does "buy to open" mean?
Buy to open makes you the owner of a new option, paying the premium to gain its right.
What do you take on when you sell to open?
Selling to open collects premium but takes on the obligation and usually ties up margin as collateral.
How many ways are there to open a single-option position?
Two actions (buy or sell to open) times two option types (call or put) give four ways to open.
Bottom Line
Opening a position is stepping into a new trade, and the first decision is which side you take. Buy to open makes you the owner, paying premium for a right with capped risk. Sell to open makes you the seller, collecting premium but shouldering an obligation and margin.
Four combinations cover every single-option trade, and spreads just stack several at once. Whatever you open, remember it is half a round trip: every position opened is one you will later close or let expire.
Keep going: the other half is closing a position, and the tools you use to do both are order types.