Option Value - Understanding Premium
When you look at an option chain it can be confusing to know what the option bid/ask prices really mean and how they relate to the strike and stock price.
Before going deep into the mathematics of option pricing, I'm going to help you understand the bigger pieces that make up an option price.
The price of an option can be represented by two components; Intrinsic Value and Extrinsic Value. These values combined make up the option's price. Take a look at these two example diagrams, I will reference these below.
Intrinsic Value
Intrinsic value is the amount of the option price that can be realized if the option is exercised. Only in-the-money options have intrinsic value.
Consider a $25 strike call option on a stock that is trading at $27.
Now, imagine that this particular call option is currently trading at $2.50. How can we better understand the meaning of this price?
Well, the first part we can look at is the option's exercise value; that is, if the option were exercised now, what would be the resulting profit.
If this option were exercised, the buyer of the option would take delivery of the shares with a purchase price of $25. The shares, however, are actually trading at $27, which means an immediate profit of $2.
This $2 is what is referred to as the Intrinsic Value; the value able to be realized if the option is exercised.
With the option priced at $2.50, we have $2 of Intrinsic Value. The remaining $0.50 is called Extrinsic Value.
Extrinsic Value
When the price of an option is trading at more than it's Intrinsic Value, the difference in price is what is called Extrinsic Value, or more commonly known as Time Value.
In our example, we determined that the option is intrinsically worth $2, but given that it is trading at a price of $2.50 means the $0.50 difference is the option's Extrinsic Value.
This $0.50 in time value represents the opportunity that the option still has remaining before it expires. More time means there is more chance that the stock will move in favor of the option buyer.
Options that are in-the-money or at-the-money will have premiums comprised of both intrinsic and extrinsic value. The amount of extrinsic value present in the price will depend on the time remaining until expiration and the implied volatility of the option.
Deep in-the-money options will have close to zero extrinsic value. And an out-of-the-money option price will 100% extrinsic value and 0 intrinsic value.
How to calculate Extrinsic Value?
Calculating the time value present in an option isn't as simple as calculating the intrinsic value; you will need the help of an option pricing model for that. If the option has a European exercise style then a Black and Scholes model will do and if the option has an American Style then you can look at a Binomial Model.
56 Comments
Joe May 11th, 2009 at 1:28pm
Hi, I dont understand with the example given in the intrinsic value, it is said that if your were long (bought) this call option and you exercised it, you would lose money by being assigned Microsoft shares at the exercise price $37, which are actually worth only $36 on the open market.
My question is whether the exercise price of $37 is from the Microsoft share which is $30 and $7 from trading value. if yes, how about $36? where the sum ($36) comes from? thanks. I hope you understand what i am trying to ask :)
lincoln March 22nd, 2009 at 11:36am
Excellent!!! using simple examples to explain difficult market situation,its is very helpful. thanks
David March 17th, 2009 at 12:52pm
Thank you, Very helpfull. Big eye opener actually.
Abdul Raoof March 4th, 2009 at 10:05am
The explanation given is highly useful and very simple to understand
Admin December 9th, 2008 at 3:40am
Hi HH,
It depends. You can download my spreadsheet:
https://www.optiontradingtips.com/pricing/free-spreadsheet.html
or view an online calculator like:
http://www.option-price.com
HH December 8th, 2008 at 1:55pm
Hello,
what is the fair value of a call option? is it what you refered to above?
Thanks
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