Rho

The sensitivity of an option's price to a one-percentage-point change in interest rates — generally the least significant of the primary options Greeks for most retail traders.

Rho measures how much an option's price changes for a 1% change in risk-free interest rates. Call options have positive rho (they become more valuable when rates rise) and put options have negative rho (they become less valuable when rates rise). The rationale involves the "carry cost" of holding stock — higher rates make it more expensive to hold a stock position, which affects the comparative value of synthetic stock positions through options.

For most retail options traders dealing with shorter-dated options, rho is negligible compared to delta, gamma, theta, and vega. A typical short-dated equity option might have a rho of 0.01, meaning a 1% interest rate change causes a $0.01 change in the option's price — a trivial effect. This is why rho is often discussed last and least among the Greeks.

Rho becomes more significant for LEAPS (long-dated options with months or years to expiration) because the interest rate effect accumulates over longer periods. For example, a two-year LEAPS call might have a rho of 0.10 or higher — a meaningful exposure when the Federal Reserve is actively changing rates. In a rapidly rising or falling rate environment, deep-in-the-money LEAPS holders may find rho to be a non-trivial component of their P&L.

This definition is for informational and educational purposes only. Nothing on Finance Compass constitutes financial, investment, or trading advice. Always conduct your own research and consult a qualified professional before making financial decisions.