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    What option Greek is most used on Expiry days?

    Theta is widely used by traders on expiry days. It measures time decay in an option premium. It shows how much value an option may lose each day as it approaches expiry. Theta is usually negative for option buyers because option premiums reduce with time, even if the market does not move.

    - ATM Options: Highest Theta decay  

    - ITM Options: Lower Theta impact  

    - OTM Options: Premium may erode quickly near expiry  

    What are different option Greeks? What are the benefits of Option Greeks? Which option Greek is most important for beginners? Why does Gamma increase near expiry? Why do Option Greeks change frequently? Why do Option Greeks slightly differ across different broker platforms? How can I access Option Greeks on ICICI Direct? What are Option Greeks?