Options Rho measures the sensitivity of a stock option's price to a change in interest rates.
Options Rho - Introduction
Options Rho is definitely the least important of the
Options Greeks and have the least impact on stock options pricing. In fact, this is the
options greek that is most often ignored by options traders because interest rates rarely change dramatically and the impact of such changes affect
options
price quite insignificantly. Options Rho measures the estimated change in the theoretical options price
with a 1% change in Interest Rate and is often fairly low. This results in the price of a call option rising only about $0.01 or $0.02 with a
1% rise in interest rate, which is very insignificant.
Why Is Options Rho Unimportant?
Changes in interest rates dramatically affect the stock market and the economy. This makes it interesting to know how much the price of your
options change with a change in interest rates through the Options Rho. However, changes in interest rates moves stocks more than is compensated by an increase
or decrease in options price due to Options Rho. At the end of the day,
Options Delta and
Options Vega rule the day when interest rates
changes or is expected to change soon. The impact of Options Rho could only be felt if all else remain stagnant in the face of something as
important as a change in interest rates, which is nearly impossible. Even if you expect a change in interest rates and put on a position that
is delta, vega,
theta and
gamma neutral (again, nearly impossible) in order to benefit from that $0.02 change, the transaction costs involved
in such a complex
hedge would have eradicated any possibility of real profits. On top of that, Options Rho is not usually needed for the
calculation of any of the options trading strategies as there are currently no interest rates specific options trading strategies.
Options Rho come in positive or negative polarity. Long call options produces positive Options Rho and long put options produces negative
Options Rho. This means that call options rise in value and put options drop in value with a rise in interest rates.
Options Rho & Time
Options Rho increases as time to expiration becomes longer.
Options Rho is usually in the 0.10 range for long expiration options and about the $0.010 range for near term options. This means that
options with long expiration
(LEAPS)are expected to rise by only $0.10 and near term options by only $0.01 with a 1% rise in interest rates. Both
of which are fairly insignificant.
Options Rho - Why Does Put Options Have Negative Rho Value?
Stock Options buying are substitutions for the actual buying or
shorting of the underlying stock. When you use all your cash to purchase shares,
those cash no longer earn interest in your bank account. However, when you choose to control the same amount of shares using a much lower amount
of money through the purchase of call options, the remaining cash continues to earn interest in your bank account. When interest rates rise,
there is more incentive to keep more cash in bank accounts, making the purchase of
call options more attractive than the purchase of shares.
More attractive means more demand and more demand justifies a slightly higher price as measured by the options rho value. On the contrary,
shorting shares put money into your bank account, earning interest. Put options as an alternative to shorting shares removed that
benefit of having extra cash in your bank account in order to take advantage of rising interest rates. Thus in times of rising interest rates,
investors move away from put options and into shorting the actual shares, thus creating a slight drop in demand for
put options and hence the
put options price. This creates the negative options rho value for put options while call options have positive rho values.
Options Rho Formula
The formula for calculation of option rho is:
Where...
d1 = Please refer to Delta Calculation T = Option life as a percentage of year
C = Value of Call Option
X = Strike Price
N(d2) = Probability of option being in the money
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