Theta Risk

Theta risk is the exposure a trader faces due to the passage of time and its negative impact on the value of an option position. This risk is most pronounced for long option holders, who lose money as the option approaches maturity if the underlying asset price does not move in their favor.

Conversely, it represents the primary profit driver for short option sellers who collect premiums as time passes. Managing theta risk requires a deep understanding of the option's Greeks and the relationship between volatility and time.

In high-volatility environments like crypto, theta risk can be masked by rapid price swings, but it remains a constant force working against the buyer. Traders often hedge theta risk by using delta-neutral strategies or by adjusting their portfolio exposure based on the remaining days to expiration.

It is a critical metric for any quantitative finance model.