Establishing a connection
Establishing a connection
FORTIS · Open Interest
FORTIS currently carries 16,39,900 contracts of call open interest against 13,84,925 of put open interest on the 29 Sep 2026 expiry, with spot at 905. The heaviest call strike is 950 and the heaviest put strike 900.
| Strike | Call OI | Put OI | Put minus call | Side |
|---|---|---|---|---|
| 860 | 775 | 1,25,550 | +1,24,775 | Put-heavy |
| 870 | 0 | 66,650 | +66,650 | Put-heavy |
| 880 | 11,625 | 1,64,300 | +1,52,675 | Put-heavy |
| 890 | 5,425 | 52,700 | +47,275 | Put-heavy |
| 900 | 1,96,850 | 3,18,525 | +1,21,675 | Put-heavy |
| 910 ATM | 1,69,725 | 93,000 | −76,725 | Call-heavy |
| 920 | 2,59,625 | 1,52,675 | −1,06,950 | Call-heavy |
| 930 | 1,58,100 | 41,075 | −1,17,025 | Call-heavy |
| 940 | 1,16,250 | 33,325 | −82,925 | Call-heavy |
| 950 | 2,65,825 | 88,350 | −1,77,475 | Call-heavy |
| 960 | 91,450 | 14,725 | −76,725 | Call-heavy |
FORTIS carries 16,39,900 contracts of call open interest and 13,84,925 of put open interest across the 29 Sep 2026 expiry, 2,54,975 more on the call side. That works out to a put-call ratio of 0.84, which on open interest alone reads as broadly balanced positioning. Figures are market close, 8 Sep 2026.
The heaviest put open interest sits at 900 with 3,18,525 contracts, and the heaviest call open interest at 950 with 2,65,825 contracts. With spot at 905, 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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