About the author

ExpiryGyan is written and maintained by Bulan Sarkar, an options educator who built this resource to fix a specific gap: clear, rigorous, India-specific teaching on option and futures expiry and settlement — the part of the lifecycle where the rules are most confusing and the risks are highest.

Editorial approach

Every explainer is drafted from first principles, checked against exchange documentation and the Black-Scholes framework, and grounded in realistic Nifty and Bank Nifty examples. Where a rule is an exchange convention that has changed (like the expiry weekday), it is labelled as current-and-revisable. Corrections are welcome — see Contact.

Part of a network

ExpiryGyan is one of the bulansarkar.com educational sites, alongside GreeksGyan (the Greeks), VolatilityGyan and others. Read our Editorial Policy and Methodology.

Last updated 11 July 2026.