Stocks · Market intelligence desk
Pre-open brief
Event

NIFTY weekly expiry — 19 October 2026

Mon 19 Oct 2026 · IN · Expiry
when
in 3 days
19 Oct 2026
past cases
311
of this class, on NIFTY
typical move
0.51%
on the day, either way
the market is asking
1.0%
to the 19 Oct expiry

What this is

as of Fri 16 Oct 15:30

The last session of a NIFTY weekly option contract. Weekly contracts are listed with a short life, so a series reaches its expiry with far less open interest behind it than a monthly one — the positions in it were mostly opened in the same week and are closed in the same week.

Who decides

The exchange decides it, not the market. NSE publishes the contract calendar well in advance, so the date is known months ahead, and it computes the settlement value from NIFTY's own closing calculation at the end of the session. Every contract in the series is cash settled against that one number: nothing is delivered and no position carries into the next day.

What moves

Time value is what goes. An option at a strike near the close carries almost none of it by the last hour, so premium at the money decays to its intrinsic value over the session while strikes further out go to nothing. Open interest at those strikes is closed out or rolled into the next series, which is why the chain's own open-interest picture is least readable on this day and most readable on the one after.

What it is not

The expiry is not an announcement. Nothing is published on the day and no new information about the economy arrives with it — what changes is that one set of contracts stops existing and the positions held in them have to be closed, rolled or settled. So the figures below are a record of what NIFTY did on these sessions, not a claim that the expiry caused any of it, and they carry their own count so a reader can see how much they rest on.

What is priced, and what has followed

as of Fri 16 Oct 15:30

the option market is asking about 1.0% by the 19 Oct expiry, 4 days away.

going into the last 311 of these, the option market was asking about 0.7% by expiry and the market travelled about 0.5% — the move was the larger of the two about 39 times in 100.

half of them landed between 0.25% and 0.92% either way

What events of this class have done

as of Fri 16 Oct 15:30
indextypical movethe middle halfleanover 1%session afterpast cases
NIFTY0.51%0.25 – 0.92%none21 in 1000.56%
311 cases
311
BANKNIFTY0.63%0.30 – 1.14%none33 in 1000.71%
311 cases
311
SENSEX0.52%0.26 – 0.91%none21 in 1000.56%
311 cases
311

what past events of this class did, per index: a base rate with its n, never a forecast of direction

The cases behind the numbers above

as of Fri 16 Oct 15:30
dateindexclosenext sessionwas askedtravelled
13 Oct 2026BANKNIFTY+1.03%−0.30%2.6%—
13 Oct 2026NIFTY+1.60%−0.44%0.7%1.6%
13 Oct 2026SENSEX+1.54%−0.34%1.2%3.3%
6 Oct 2026BANKNIFTY+0.76%−0.13%3.1%—
6 Oct 2026NIFTY+0.98%−0.76%0.7%1.0%
6 Oct 2026SENSEX+0.95%−0.59%1.3%1.1%
22 Sep 2026BANKNIFTY−0.45%+0.59%1.4%3.9%
22 Sep 2026NIFTY−0.36%+0.50%0.6%0.4%
22 Sep 2026SENSEX−0.44%+0.40%0.9%1.7%
15 Sep 2026BANKNIFTY−1.43%+0.89%2.2%4.1%
15 Sep 2026NIFTY−1.19%+0.43%0.9%1.2%
15 Sep 2026SENSEX−1.04%+0.45%1.3%0.6%
8 Sep 2026BANKNIFTY−0.54%−0.85%2.3%5.0%
8 Sep 2026NIFTY−0.61%−0.86%0.5%0.6%
8 Sep 2026SENSEX−0.73%−1.08%0.9%1.6%
1 Sep 2026BANKNIFTY−1.06%−0.41%2.5%6.5%
1 Sep 2026NIFTY−0.10%−0.59%0.6%0.1%
1 Sep 2026SENSEX−0.02%−0.49%0.9%1.0%
18 Aug 2026BANKNIFTY−0.41%−0.04%1.5%0.0%
18 Aug 2026NIFTY−0.55%−0.32%0.5%0.5%
18 Aug 2026SENSEX−0.63%−0.42%0.9%0.2%
11 Aug 2026BANKNIFTY−0.42%+0.77%2.1%0.3%
11 Aug 2026NIFTY−0.46%−0.15%0.6%0.5%
11 Aug 2026SENSEX−0.49%−0.24%1.0%0.6%
4 Aug 2026BANKNIFTY−0.58%−0.29%2.4%1.3%
4 Aug 2026NIFTY−0.64%+0.04%0.8%0.6%
4 Aug 2026SENSEX−0.27%+0.19%0.9%0.4%
21 Jul 2026BANKNIFTY−0.19%−1.23%1.8%2.1%
21 Jul 2026NIFTY−0.21%−0.79%0.6%0.2%
21 Jul 2026SENSEX−0.31%−0.92%1.1%1.7%
14 Jul 2026BANKNIFTY−1.15%+0.51%2.5%2.4%
14 Jul 2026NIFTY−0.66%+0.11%0.7%0.7%
14 Jul 2026SENSEX−0.72%+0.17%1.2%0.6%

Also on this day

as of Fri 16 Oct 15:30
← every published date