Theta Quant Interview Guide
Theta quant interview guide for option time decay, extrinsic value, expiry behavior, moneyness, examples, and options risk tradeoffs.
Candidates discussing option value, expiry, and market-making risk.
Theta measures time sensitivity
Theta describes how option value changes as time passes, holding other inputs fixed. It is often discussed as time decay for long option positions.
Extrinsic value decays
Options contain value from possible future movement. As expiry approaches, there is less time for favorable movement, so extrinsic value can shrink.
Concrete example
An out-of-the-money option with no intrinsic value may lose value as expiry approaches if the underlying and volatility do not move enough to offset time decay.
Theta interacts with gamma
Long gamma positions often pay theta, while short gamma positions may collect theta but face move risk. This tradeoff appears in market-making discussions.
Common mistakes
Candidates often say theta is always bad. It depends on whether the position is long or short options and what risk is being exchanged for time decay.
Practice the pattern
Use the LeetQuidity curriculum and calibration to turn this topic into a focused practice plan.