Think of open interest like a bet. You go down to the race track and put $10 on the 6 horse, Trample Me Slowly, in the fourth race. Until the winning horse crosses the finish line, you've got an open interest in that horse.
Now transfer that concept to a derivatives exchange, in the context of options and futures trading. You purchase an option to buy 100 shares of GOOG at $1,100, expiring in August. Until you close out the position, exercise the option, or let the option expire in August, that counts as open contract. Add up all the open contracts for GOOG with an August expiration...that equals the open interest for that type of option.
Related or Semi-related Video
Finance: What Is a Call Option?25 Views
finance a la shmoop. what is a call option? option? option, where are you? okay
yeah yeah. not phone options, call options. and a close but no cigar. a call option [man smokes in a tub of cash]
is the right to call or buy a security. the concept is easy the math is hard.
you think Coca Cola's poised for a breakout as they go into the new low
calorie beverage business. their stock is at 50 bucks a share and you can buy a [man stands on a stage as crowd cheers]
call option for $1. well that call option buys you the right
to then buy coke stock at 55 bucks a share anytime you want in the next
hundred and 20 days. so let's say Coke announces its new sugarless drink flavor
zero it's two weeks later and the stock skyrockets to fifty eight dollars a
share. you've already paid the dollar for the option now you have to exercise it. [man lifts weights]
so you buy the stock and you're all in now for fifty five dollars plus one or
fifty six bucks a share and your total value is now fifty eight bucks. well you
could turn around today and sell the bundle that moment, and you'll have
turned your dollar into two dollars of profit really fast. and obviously had the [equation on screen]
stock not skyrocketed so quickly well you would have lost everything. still you
lucked out and now you're sitting on some serious cash, courtesy of your call [two men in a tub of cash]
options. as for Coke flavor zero turned out to be nothing more than canned water.
Up Next
A derivative of a security is a "something" which derives its value based on the performance of that security... either a put option or a call option.
What is a put option? A put option is a type of contract that lets the investor sell shares of a stock at a certain price and within a window of ti...