Establishing a connection
Establishing a connection
FORTIS · Option Chain
The FORTIS option chain below shows every listed strike for the 29 Sep 2026 expiry with call and put open interest, last traded premium, volume and implied volatility side by side. FORTIS was last read at 905, putting the at-the-money strike at 910.
| Strike | Call OI | Call LTP | Put LTP | Put OI |
|---|---|---|---|---|
| 860 | 775 | 60 | 3.65 | 1,25,550 |
| 870 | 0 | — | 4.9 | 66,650 |
| 880 | 11,625 | 39.2 | 6.85 | 1,64,300 |
| 890 | 5,425 | 30.5 | 9.95 | 52,700 |
| 900 | 1,96,850 | 23.55 | 13.45 | 3,18,525 |
| 910 ATM | 1,69,725 | 18.35 | 17.55 | 93,000 |
| 920 | 2,59,625 | 14.4 | 24.7 | 1,52,675 |
| 930 | 1,58,100 | 10.4 | 30 | 41,075 |
| 940 | 1,16,250 | 7.65 | 38.85 | 33,325 |
| 950 | 2,65,825 | 5.6 | 46 | 88,350 |
| 960 | 91,450 | 3.9 | 61.95 | 14,725 |
The at-the-money strike for FORTIS is 910, taken from a spot reading of 905 on the 29 Sep 2026 expiry. The ATM strike rolls as spot moves, so it is re-selected through the session rather than fixed at the open. It carries the highest time value of any strike, which is why decay is felt most sharply there.
The heaviest call open interest sits at 950 with 2,65,825 contracts, and the heaviest put open interest at 900 with 3,18,525 contracts. Those two strikes are commonly read as the working range — calls above spot as resistance, puts below as support. They are crowding observations, not guaranteed barriers.
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.
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The same symbol across every other live workspace.