In this series we examine investment products and strategies, from the mundane to the highly complex, explaining how they work and why we do or do not use these particular products or strategies in our portfolios.
As the name implies, an equity option gives the holder the right to buy (or sell, depending on the type of option) a particular common stock at a given “strike” price at some point in the future.
Due to the inherent uncertainty of asset prices in the distant future, options tend to be constructed to expire in nine months or less, though there are exceptions to this convention 1. The price of an option is a function of the price of the underlying asset relative to the strike price of the option (the option value) and the time to expiration (the time value). In general, an investor would choose to buy a call option on a particular stock if they believed the price of that stock was going to rise during the term of the contract, or buy a put if they thought the stock price would fall. Options can also offer the opportunity to use large amounts of leverage for a speculative investor.
While Empirical does not believe in using options to speculate on asset prices, we feel that it can be prudent to hedge equity exposure with options, and are willing to assist our clients if they would like to purchase this type of portfolio protection.
Equity option contracts are for 100 shares of the underlying stock, although the premiums are listed on a per share basis. However, unlike forwards or futures, some options can be exercised before their expiration date. Along these same lines, investors could use options to hedge against adverse movements in a position they already held. Using the example of a $5 call option on a $100 stock, an investor would be able to purchase 20 options for the price of one share of stock.


While European and American options are by far the most common type, there are numerous other types of options, such as Asian, Bermudan, and down-and-in options.
This post focuses on option contracts, which allow investors to buy or sell an asset in the future as well, but does not require them to do so. For example, an option on ABC stock might have a listed premium of $5, which would mean that an investor would purchase an option contract for 100 shares of ABC at the total price of $500. This type of option is known as an “American” option, in contrast to a “European” option, which can only be exercised at expiration 2. If the price of the underlying asset is above the strike price of a call option (or below the strike price of a put option), the option is said to be “in the money”, meaning it has a positive value if it were to be exercised instantly.
The most an investor who purchases an option can lose is the initial premium, meaning the minimum payoff (assuming the option expires worthless) is nothing. Returning to our earlier example, an investor who held a portfolio with ABC stock could purchase a put option on ABC to protect against a drop in the price of the stock. However, this additional leverage adds a large amount of risk, if the options expire worthless, then the investor will have lost 100% of their investment. However, unlike forward and futures contracts which are costless at initiation, an option purchaser must pay a premium to hold the contract. If the option allowed an investor to buy the stock at the pre-specified strike price, it would be a “call” option. Options where the asset price is below the strike on a call (or above the strike on a put) are said to be “out of the money”, and would be worthless if exercised at that point.


However, as long as the option still has time until expiration, there is always a chance that the underlying asset price could recover, giving the option some value at expiration.
Because the cost of an option is only the premium (which tends to be a small percentage of the price of the underlying stock), purchasing options can be a relatively cheap way to hedge a portfolio. Additionally, profits can be generated by “writing” (selling) options, though this can be a risky strategy. Conversely, the option to sell the stock at the strike price would be known as a “put” option. If the asset price is equal to the strike price, the option is referred to as “at the money”. Naturally, this time value is largest at the initiation of the contract, and gradually deteriorates as the time frame of the option shrinks, eventually going to zero at the actual expiration of the contract. The writer of the option receives the option premium, but they will be obligated to fulfill the other end of the contract if the option purchaser exercises the option. Thus, at any given point, the premium of an option will be some combination of the option value and the time value.




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Comments

  1. spychool

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    25.02.2014

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    25.02.2014