NIFTY expiry 11 August 2026: what the 24,450 options did in the last 30 minutes
On Tuesday 11 August 2026 the NIFTY strike nearest the index at 15:00 was 24,450. The index went from 24,471 at 15:00 to 24,472 at 15:30, up 0 points across the settle walk.
The at-the-money legs, 15:00 to 15:30
| Leg | 15:00 | High | Low | 15:30 | End vs 15:00 | Open interest |
|---|---|---|---|---|---|---|
| 24,450 CE | ₹58.9 | ₹58.9 15:00 | ₹12.8 15:21 | ₹21.9 | 0.4× | 20.0M → 15.3M |
| 24,450 PE | ₹14.3 | ₹17.1 15:08 | ₹0.1 15:30 | ₹0.1 | worthless | 26.2M → 26.4M |
Premium of the strike nearest the index at 15:00, sampled every ten seconds from the NSE option chain. Index values are the chain's own quote. Dotted verticals mark a pin-book flip on Gamma Terrain.
What happened
The 24,450 call was ₹58.9 at 15:00. It never traded meaningfully above its 15:00 price. Its low was ₹12.8 at 15:21, less than half of where it started the half hour. It ended at ₹21.9, 0.4× the 15:00 price. Open interest at the strike went from 20.0 million to 15.3 million, so positions were closed through the window.
The 24,450 put was ₹14.3 at 15:00. Its high was ₹17.1 at 15:08. Its low was ₹0.1 at 15:30, less than half of where it started the half hour. It ended at ₹0.1, worthless.
Chain quotes were missing 15:00–15:01, 15:01–15:02, 15:02–15:03, 15:03–15:04, 15:04–15:05, 15:05–15:06, 15:06–15:07, 15:07–15:08, 15:08–15:09, 15:09–15:10, 15:10–15:11, 15:11–15:12, 15:12–15:13, 15:13–15:14, 15:14–15:15, 15:15–15:16, 15:16–15:17, 15:17–15:18, 15:18–15:19, 15:19–15:20, 15:20–15:21, 15:21–15:22, 15:22–15:23, 15:23–15:24, 15:24–15:25, 15:25–15:26, 15:26–15:27, 15:27–15:28, 15:28–15:29, 15:29–15:30: the exchange rate-limited the poll in the endgame, so the chart shows a hole there rather than a line. Highs and lows inside a hole are not known.
For context, across 21 NIFTY and SENSEX expiries measured to 2026-09-08, 15 of 42 at-the-money legs doubled at some point in this window, 26 lost half, and 13 ended at or above their 15:00 price. This page states what the tape did. It is not a recommendation to buy or sell anything.
Gamma Terrain shows the pin, the walls, the book read and every large print, tick by tick, on NIFTY and SENSEX.
The recap is the after-photo. The terrain is the window while it happens.
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