What is a put option?
- A put gives you the right to sell at a fixed strike price.
- Puts rise in value as the underlying price falls.
- Your maximum loss is the premium paid.
- Puts act as insurance against portfolio declines.
- Time decay erodes put value as expiration approaches.
What is a put option?
A put option is a derivative that gives you the right, not the obligation, to sell an asset at a fixed strike before expiration. You pay a premium for that right. A put profits when the underlying price falls.
Puts are built for a falling market. If the asset drops below your strike, your put gains value. If it stays above, yours is worthless at expiration. They are the market's tool for profiting from a decline.
How does a put option work?
Say a stock trades at $50. You buy a put with a $45 strike for $2 per share. One contract covers 100 shares, so you pay $200. If the stock falls to $40, your put is worth $500.
If the stock stays above $45 through expiration, your put is worthless and you lose the $200 premium. Your entire risk is the premium. The stock can soar and you still lose only what you paid.
What does in the money mean for a put?
A put is in the money when the stock trades below your strike price. That means it has intrinsic value. It is at the money when prices meet, and out of the money when the stock sits above your strike.
Strike price and premium define everything about a put. Exercise is the act of selling at the strike. The deeper in the money, the more intrinsic value, and the less time value matters.
When can you exercise a put?
An American put lets you exercise any time before expiration. A European put locks exercise to the expiration day. US stock puts are mostly American style. Your right to sell at the strike lives the whole life of the contract.
Choosing the wrong style costs you control. An American put bails you out on any crash, any day. A European put forces you to ride until the end. Know which one you hold before you buy it.
How do puts protect your portfolio?
You own stock; you buy a put on it. If the price falls, your holdings lose value but your put gains. The gains offset losses, capping the decline. That is a hedge, insurance in contract form.
The premium is the price of peace of mind. It's a defined cost for protection sized to a portfolio you cannot afford to crash. In good markets it drags returns. In a crash it caps your loss.
What does a put cost you?
The premium is your total cost and your maximum loss. A bought put can lose that entire premium, no more. The expense is the price of the right you hold and the protection it provides.
Time decay makes puts a wasting asset. Every day closer to expiration, time value shrinks. A put kept too long bleeds away even if the market doesn't cooperate. Buy protection for the window you need.
When does a put pay off?
A put pays off when the asset falls below your strike by more than the premium you paid. The bigger the drop, the larger the gain. Your break-even is the strike minus the premium, and the deep, violent drops reward you most.
What are the Greeks for a put?
Delta measures how much a put's price moves for each dollar the underlying moves. Vega tracks its sensitivity to volatility, and volatility is a key driver of a put's value. Rising expected swings lift time value; higher interest rates shift put pricing too.
How is a put related to a call?
Put call parity ties a put, a call, and the underlying together. A European put is equivalent to a call plus a short forward, so you can build one position from the others. Puts and calls are two faces of the same price, not separate worlds.
What are the risks of buying puts?
The first risk is a market that does not fall. If the asset rises or drifts sideways, your put decays to zero and you lose the premium. The second is cost, because volatile markets price puts high and crash insurance gets dear exactly when worry is highest.
Shorting the stock carries the same bearish bet but no loss cap. If the asset soars, a short bleeds without limit. A put gives up only its premium. That floor is exactly why a put beats shorting for a bounded bet.
How do you close a put position?
You can sell a put before expiration. If it gained value, pocket the difference. If it lost value, cut your loss. Most traders sell to close rather than exercise, which banks the gain without waiting for expiration.
What about writing puts?
Writing a put sells the right to sell. You collect the premium. If the stock stays above the strike, you keep it. If it falls, you buy at the strike. Your risk is the strike price minus the premium.
A naked put backs itself with no shares and demands margin. If the asset falls to zero, you buy at the strike and hold the whole gap. That is a tail blowup, not a hobby. Cap your risk or cover the sale.