A call
stock option gives the buyer the right but not the obligation
to buy a specific security at a specific price by a specific
date. Its a way of locking in the purchase price of the stock
option for a period of time.
A put stock option gives the buyer the right but not the obligation
to sell a specific security at a specific price by a specific
date. Its a way of locking in the sales price of a stock
option for a period of time.
The specific date is known as the contracts expiration date.
On or prior to the expiration date the holder of the stock option
contract has the right to exercise the stock option.
The term exercise means the process by which the buyer of an
option converts the stock option into a long stock position
in the case of a call or a short stock position in the case
of a put.
The term assign or assignment means the process by which the
seller of a stock option is notified of the buyers intention
to exercise.
Buyers of options exercise. The seller of a stock option is
assigned.
The strike price or exercise price is defined as the price at
which the holder has the right to buy (for a call) or sell (for
a put), the underlying security. Strike prices are quoted in
dollars, i.e. May 50 calls means May $50.00 strike calls.
There are several other important terms in a stock option contract:
A long position is defined as any position which will theoretically
increase in value should the price of the underlying security
increase. Vice versa, the position will theoretically decrease
in value should the underlying security decrease.
The buying of a stock option, the buying of a call, or the sale
of a put all constitutes a long position.