Establishing a connection
Establishing a connection
IDEA · Open Interest
IDEA currently carries 1,60,76,15,700 contracts of call open interest against 86,07,73,425 of put open interest on the 29 Sep 2026 expiry, with spot at 15.42. The heaviest call strike is 15 and the heaviest put strike 14.
| Strike | Call OI | Put OI | Put minus call | Side |
|---|---|---|---|---|
| 10 | 1,30,79,925 | 69,33,075 | −61,46,850 | Call-heavy |
| 11 | 14,29,500 | 1,07,92,725 | +93,63,225 | Put-heavy |
| 12 | 72,18,975 | 4,03,83,375 | +3,31,64,400 | Put-heavy |
| 13 | 3,60,94,875 | 15,38,14,200 | +11,77,19,325 | Put-heavy |
| 14 | 19,46,26,425 | 27,33,20,400 | +7,86,93,975 | Put-heavy |
| 15 ATM | 47,43,79,575 | 20,67,05,700 | −26,76,73,875 | Call-heavy |
| 16 | 37,28,85,075 | 15,18,84,375 | −22,10,00,700 | Call-heavy |
| 17 | 21,43,53,525 | 1,13,64,525 | −20,29,89,000 | Call-heavy |
| 18 | 21,62,83,350 | 33,59,325 | −21,29,24,025 | Call-heavy |
| 19 | 60,03,900 | 0 | −60,03,900 | Call-heavy |
| 20 | 7,12,60,575 | 0 | −7,12,60,575 | Call-heavy |
IDEA carries 1,60,76,15,700 contracts of call open interest and 86,07,73,425 of put open interest across the 29 Sep 2026 expiry, 74,68,42,275 more on the call side. That works out to a put-call ratio of 0.54, which on open interest alone reads as call-heavy positioning. Figures are market close, 8 Sep 2026.
The heaviest put open interest sits at 14 with 27,33,20,400 contracts, and the heaviest call open interest at 15 with 47,43,79,575 contracts. With spot at 15.42, those strikes bracket the range the option market is positioned around. They are crowding observations rather than levels that must hold — they break regularly, usually when the open interest behind them unwinds rather than defends.
Open interest is the total number of option contracts in a strike that are still open and not yet squared off or settled. It counts positions, not trades. Rising open interest means fresh contracts are being created and new money is entering that strike; falling open interest means existing positions are being closed out.
Writers are the sellers of an option contract, taking the premium in exchange for the obligation. Because a writer carries open-ended risk, large written positions tend to be defended, and the strikes carrying the heaviest written open interest are the ones price most often stalls around. That is a description of where the crowd sits, not a guarantee about what price will do.
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