NIFTY gamma blast today: what the 22,900 options did after 15:00 on the 19 October 2026 expiry
Next NIFTY expiry: Tuesday 27 October 2026; the one after: Tuesday 3 November 2026. From the exchange's F&O contract list.
On Monday 19 October 2026 the NIFTY strike nearest the index at 15:00 was 22,900. The index went from 22,890 at 15:00 to 22,889 at 15:30, down 1 points across the settle walk.
Shown: the latest NIFTY expiry, Monday 19 October 2026. NIFTY weekly options expire on Tuesdays (a day earlier when that day is a market holiday); this page switches to the new expiry from 15:00 IST that day. Permanent page for this expiry: NIFTY 19 October 2026. SENSEX: SENSEX gamma blast today.
The at-the-money legs, 15:00 to 15:30
| Leg | 15:00 | High | Low | 15:30 | End vs 15:00 | Open interest |
|---|---|---|---|---|---|---|
| 22,900 CE | ₹22.0 | ₹46.2 15:25 | ₹0.1 15:30 | ₹0.1 | worthless | 36.6M → 26.8M |
| 22,900 PE | ₹35.9 | ₹61.6 15:08 | ₹1.4 15:26 | ₹11.1 | 0.3× | 19.8M → 18.0M |
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.
What happened
The 22,900 call was ₹22.0 at 15:00. It reached ₹46.2 at 15:25, 2.1× its 15:00 price. Its low was ₹0.1 at 15:30, less than half of where it started the half hour. It ended at ₹0.1, worthless. Open interest at the strike went from 36.6 million to 26.8 million, so positions were closed through the window.
The 22,900 put was ₹35.9 at 15:00. Its high was ₹61.6 at 15:08. Its low was ₹1.4 at 15:26, less than half of where it started the half hour. It ended at ₹11.1, 0.3× the 15:00 price.
Gamma Terrain's pin-book read flipped: at 15:30 the resting depth read the put strikes below the pin thinning (puts 23 %, calls 15812 % of their baseline). A flip names the side whose book is emptying. Across 45 sessions it has not been a direction tell, it is a vacuum tell.
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.
Earlier NIFTY expiries
- Tuesday 13 October 2026 · ATM 22,70022700 CE: ₹26.5 at 15:00 → high ₹35.1 (15:11) → ₹21.9 at the end (0.8×) · 22700 PE: ₹32.1 at 15:00 → high ₹41.0 (15:02) → ₹0.1 at the end (worthless)
- Tuesday 6 October 2026 · ATM 22,70022700 CE: ₹25.9 at 15:00 → high ₹76.0 (15:30) → ₹76.0 at the end (2.9×) · 22700 PE: ₹27.4 at 15:00 → high ₹27.4 (15:00) → ₹0.1 at the end (worthless)
- Tuesday 29 September 2026 · ATM 22,65022650 CE: ₹44.9 at 15:00 → high ₹72.5 (15:10) → ₹66.2 at the end (1.5×) · 22650 PE: ₹26.3 at 15:00 → high ₹42.5 (15:22) → ₹0.1 at the end (worthless)
- Tuesday 22 September 2026 · ATM 23,35023350 CE: ₹38.4 at 15:00 → high ₹45.0 (15:11) → ₹0.1 at the end (worthless) · 23350 PE: ₹31.2 at 15:00 → high ₹40.6 (15:20) → ₹20.9 at the end (0.7×)
- Tuesday 15 September 2026 · ATM 23,15023150 CE: ₹66.0 at 15:00 → high ₹113 (15:20) → ₹0.1 at the end (worthless) · 23150 PE: ₹33.6 at 15:00 → high ₹55.8 (15:21) → ₹31.4 at the end (0.9×)
Side by side: NIFTY expiry analysis, the last five · every expiry: expiry recaps.
Quick questions
Did gamma blast happen today in NIFTY?
What is a gamma blast?
What time does gamma blast happen in NIFTY?
Is gamma blast predictable?
Gamma Terrain shows the pin, the walls, the book read and every large print, tick by tick, on NIFTY and SENSEX.
This page is the after-photo. The terrain is the window while it happens.
These pages describe market activity. They are not investment advice and not a recommendation to buy or sell any option. TBTflow is not registered with SEBI.
Read every panel behind these numbers, chapter by chapter.
Trading by the Numbers walks through the quantitative reads behind a modern F&O dashboard — order-flow imbalance, footprints, VWAP bands, OI flow, gamma structure and the expiry endgame — in plain trader-to-trader language.