What Does a High Theta Value Imply for an Option’s Value?
Theta measures the rate at which an option's value decays as the time to expiration decreases. A high negative Theta value implies that the option is losing a significant portion of its value each day due0 to time decay.
This effect is most pronounced for at-the-money options close to expiration.
Glossar
Negative Theta Value
Exposure ⎊ Negative Theta Value signifies that the option position is losing value purely due to the passage of time, a condition inherent to all long option positions that have not yet reached intrinsic value parity.
High Theta Value
Definition ⎊ A high Theta value, typically expressed as a large negative number for a long option, signifies a substantial daily erosion of the option's extrinsic value due to the passage of time.