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Market Intelligence › Basic Terminologies
The strike where most contracts are open.
Published by The Retail Trader · JUL 31, 2026 · Derivatives (F&O)
Highest OI Strike — The strike where the most contracts are open. On Call side it is often seen as resistance and on Put side it is often seen as support.
This term comes under Derivatives (F&O), in the section "Reading OPTION CHAIN". The option chain is not just a table of premiums — it tells the whole story of positioning:
Other terms in this group — understanding them together is more useful:
• Change in OI
• OI Concentration
• PCR (Put-Call Ratio)
• Max Pain
• Expected Move
• IV Skew / Smile
• Far Strike Liquidity
• Theoretical vs Market Price
• Open Interest Buildup Table
To read the entire group and all its examples in one place, see the journal "DERIVATIVES: DICTIONARY OF FUTURES & OPTIONS" - this term has been taken from there.
This entry is for educational purposes only and is not a recommendation to buy or sell. Exchanges change charges, margins, lot sizes and expiry rules from time to time, so verify any figures with your broker or exchange.