Put Option
There are basically only two types of options—calls and puts.
A put option gives the holder the right but not the obligation to sell a certain stock (underlying security) at a certain price (strike price) by a certain date (expiration date).
Example: Suppose you own 100 shares of The XYZ Zipper Company and it's trading at $40/share. If you believe the stock to be at risk of falling in the near term, you could purchase a put to give yourself some protection.
Let’s suppose that you decide to purchase a put option expiring in one month at the $35 strike price for $1 (multiplied by 100 shares = $100). You now have the right, but not the obligation, to sell your stock for $35/share between now and expiration.
If the stock stays above $35/share, your put expires worthless and you keep your stock. If, however, the stock does take a dive, your purchase of the put guarantees that you’ll still be able to get out at the strike price of $35/share no matter how low the stock itself trades.
The above is an example of a protective put, a hedging strategy designed to protect your holdings from big declines. But there is no requirement that you own the underlying stock in order to purchase a put, and, in fact, most purchasers of puts don't own the stock.
Most buyers of puts are simply betting that a stock will fall in price because, all else being equal, when a stock tumbles, the value of its corresponding puts will increase (see table below).
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