Buying vs Selling Options: The Two Sides of Every Trade

You have bought a lot of options by now. A house deal in Lesson 1, a soda voucher in Lesson 2, a championship ticket in Lesson 3, a phone buyback in Lesson 4. Every time, you paid a small premium and walked away with a right.

But there is a question we have quietly skipped four times: who took your money?

Someone always did. Every promise you locked in had a person on the other side of the counter, pocketing your fee and agreeing to deliver if you ever came back. That person is the seller. This lesson, you walk around the counter and stand where they stand.

Let us go back to the box office from Lesson 3.

You paid $10 for the right to buy a championship ticket at $100. Simple. But picture the worker who sold you that promise. They just collected $10 from you, and in return they agreed to hand you a ticket for $100 if you ask, anytime in the next month. They have your cash already. Now they wait.

That worker is the option seller. And their side of the deal works nothing like yours.

So Who Took Your Money?

Every option has exactly two people: the one who buys it and the one who sells it. For every right that gets bought, someone else sold that right. They are two ends of the same handshake.

You already know the buyer cold, because you have been the buyer this whole time. So we only have one new character to meet: the seller.

The seller is the box office. They take your premium up front, and in exchange they make you a promise they are now stuck with. (Quick definition: selling an option to open a trade is also called writing it, so a seller is sometimes called the writer. Same person, two names.)

That is the whole new idea. Now let us see what it costs them and what it earns them.

The Buyer Has a Right. The Seller Has an Obligation.

Here is the one sentence that separates the two sides, so read it twice.

The buyer gets a right. The seller takes on an obligation.

A right means you choose. As the buyer, you look at the ticket later and decide: use it, or walk away. Nobody can force you.

An obligation means you must. As the seller, you do not get to choose. You collected the fee, so now you wait and do whatever the buyer decides. If they want their ticket at $100, you hand it over. You gave up control the moment you took the cash.

So the trade is a swap of cash for control. The seller gets money today. The buyer gets the power to decide later. That swap is the heart of every option, and it points the buyer and the seller in opposite directions: the buyer wants the option to come alive, and the seller wants it to fade to nothing.

Watch the Seller Make Money

Let us run the exact championship ticket from Lesson 3, but this time stand at the box office instead of in line. You collected $10 from the buyer for the right to buy a ticket at $100.

The team collapses. Tickets drop to $50. Why would the buyer pay $100 to you when they can grab one for $50 anywhere? They would not. They walk away and let the promise expire. And you, the box office, keep their $10 free and clear. You delivered nothing, and you are up $10.

That is how a seller wins. Not with a big payday, but by collecting the fee and watching the buyer's right quietly expire worthless. When nothing happens, the seller still gets paid.

And here is the part that makes selling tempting: most options expire worthless. Most of the time, the stock does not move far enough, fast enough, for the buyer's option to pay off. So sellers collect a lot of small fees and keep most of them.

The Risk Flips

Now the other outcome, the one that matters most.

The team makes the final. Tickets soar to $400. The buyer happily uses their right and buys from you at $100. But you are the box office. You must hand over a ticket now worth $400, and all you get is $100 for it. You lose $300 on the ticket. Even after the $10 you pocketed earlier, you are down $290.

Look at that number against the buyer's. When the team won, the buyer made $290. You, the seller, lost $290. When the team collapsed, the buyer lost $10 and you kept $10. The two sides are a perfect mirror. One person's gain is the other's loss, dollar for dollar.

And that mirror exposes the catch in selling. Stack the two sides up:

• The buyer risked $10 and could make $290, or far more if the ticket soared even higher. Small fixed risk, large reward.
• The seller could make $10 and might lose $290, or far more if the ticket soared even higher. Small fixed reward, large risk.

That is the trade-off at the center of this lesson. A buyer's loss is capped at the premium. A seller's reward is capped at the premium, while the loss is not capped the same way. The higher the ticket climbs, the more the box office bleeds.

So selling is not simply the easy money it looks like when options keep expiring worthless. It pays you small and often, and then asks you to cover a loss that can run much larger than your fee. Worth doing, but only with your eyes open.

So Why Would Anyone Sell?

If the reward is small and the risk is large, why would anyone take that side on purpose?

Because it is exactly what an insurance company does, and insurance companies do fine.

Think about car insurance. The company collects a premium from millions of drivers every month. Most of those drivers never crash, so most of those premiums are pure profit. Yes, a few drivers wreck and the company pays out big. But across everyone, the steady stream of small premiums more than covers the rare large payout. The odds are on the seller's side.

An option seller plays the same game. They collect premium after premium, knowing most options expire worthless, accepting that once in a while one moves against them and stings. There is even a second tailwind: options lose value as expiration gets closer, and that decay works for the seller. (We give that effect its own lesson later, called theta.)

When I was advising clients, the ones itching to sell options were almost never the brand-new ones, and that was the right instinct. Selling has a real place, and there are careful versions where you already own the shares or set the cash aside, which cap the danger and which later lessons walk through. But the plain version asks you to accept a small, sure reward in front of a risk that can run much larger. That is a fine trade once you understand it, and a trap before you do. So for now, simply knowing the seller exists, and seeing how their side mirrors yours, is exactly enough.

Bottom Line

Every option trade is a handshake between two people. The buyer pays a premium for the right to choose. The seller collects that premium and accepts the obligation to deliver. When the option expires worthless, which is often, the seller keeps the cash. When it pays off big, the seller is the one who covers it.

You have spent four lessons as the buyer, risking a little to maybe make a lot. Now you can see the other hand in the handshake: the seller, making a little to risk a lot, betting that most of the time, nothing much happens.

Next up: Strike Price Explained. You have used the strike in every example so far without choosing it. Next we slow down on that one number and learn how to pick it.