Short Put
A short put means selling a put to collect premium, a mildly bullish trade. Learn how it works, what you risk, and why it is the engine behind the cash-secured put.
A short put means you sold a put option. "Short" is trader-speak for having sold something you did not own first. When you sell a put, you collect a premium up front, and in return you agree to buy the stock at the strike if it falls to that price.
It is a mildly bullish trade. You are betting the stock stays flat or rises, so the put you sold expires worthless and you keep the cash. Let me show you.
What "Short" Means
In trading, short means you sold it and want it to lose value. The mirror of a long put, which you bought and want to gain. When you are short a put, you profit if that put becomes worthless, which happens when the stock stays above the strike.
So a short put wins in exactly the cases a long put loses. The seller collects the premium the buyer paid, and roots for the option to fade to nothing.
Watch a Short Put Work
Apple is at $200, and you think it will hold steady or climb. You sell one put:
- Strike: $190, where you would agree to buy
- Premium collected: $4 a share, which is $4 times 100, or $400 in your pocket now
Apple stays at $200. The put never reaches $190. It expires worthless, and you keep the full $400. That is your maximum profit, known from the start.
Apple falls to $185. You are assigned. You buy 100 shares at $190. Because you collected $4, your real cost is $186 a share. You now own the stock, a bit below today's price, with income already banked.
Your max profit is the $400 premium. Your risk is the stock falling: if Apple truly crashes, you are on the hook to buy at $190 while the market drops well below. The premium cushions it, but a short put carries real downside.
Cash-Secured vs Naked
Here is the crucial fork. A short put is only prudent if you have the cash to back it.
Cash-secured. You set aside the full $19,000 to buy the shares if assigned. This is the cash-secured put, a calm income trade on a stock you would happily own.
Naked. You sell the put without the cash set aside, leaning on margin. This is a naked put, and it is far riskier, because assignment can demand money you do not have on hand.
Same trade mechanically. Very different risk, depending on whether it is backed.
- A short put is a sold put: "short" means you sold it.
- It is mildly bullish: you profit if the stock stays above the strike.
- Max profit is the premium; the risk is being assigned as the stock falls.
- Back it with cash (cash-secured) rather than leaving it naked.
Pop Quiz
Three quick questions to see what stuck. Pick an answer and the explanation shows up right away.
What does "short put" mean?
"Short" means you sold it. A short put is a sold put, where you collect premium up front.
When does a short put reach its maximum profit?
You keep the full premium when the put expires worthless, which happens if the stock stays above the strike.
What makes a short put much safer to run?
A cash-secured short put has the money ready to buy the shares. Leaving it naked, on margin, is far riskier.
Bottom Line
A short put is a sold put: a mildly bullish income trade where you collect premium and agree to buy the stock if it falls to your strike. You keep the premium if the stock holds up, and you buy shares at a discount if it dips.
The key is to back it with cash and only sell puts on stocks you would be glad to own. Done that way, the short put is one of the steadiest income tools in options.
Keep going: the backed version is the cash-secured put, and the risky unbacked version is the naked put.