Monday observations — NIFTY enters May at 24,043 with vol regime in 94th percentile

5-second read. NIFTY closed Thursday at 24,043 after a 3-day weekend (Maharashtra Day Friday). 30-day realized vol now stands at 23.3% — 94th percentile of the trailing year vs a 1Y average of 13.4%. The last NIFTY weekly expiry was Tuesday 28-Apr (flat: −0.14%, range 0.84%). The week's intraday low was 23,800 on Thursday (a non-expiry session) — recovered 244 points to close. This post describes what the tape printed, nothing about what it should do next.

What the dataset shows

The last weekly expiry (Tue 28-Apr) was a quiet print — open 24,050, close 24,017, range 0.84%. In the table below, 6 of the last 8 NSE weekly expiries closed within ±0.5% of the open. Expiry days have been compressed.

The non-expiry sessions inside the same window were not. Last Thursday alone moved 275 points open-to-low (24,000 → 23,800) before recovering to close at 24,044. Wednesday 22-April reversed 250+ points off the highs. Realized vol has been clustering between expiries, not on them — that is the pattern in the trailing two weeks, observed in the data.

Levels printed in the recent tape

These are descriptive references — historical points the index has touched. They are not trade levels and Quantcents does not publish trade plans.

Lows of the trailing 5 sessions:

• 23,800 — Thursday's intraday low. Touched once, closed above.
• 23,500 — round number sitting near the 50-day moving average.

Highs of the trailing 5 sessions:

• 24,075 — Thursday's intraday high.
• 24,328 — last Tuesday's intraday high.
• 24,581 — 21-April peak (a Tuesday weekly-expiry close).

The index closed Thursday in the middle of its 5-day band.

Cross-reference notes for readers

The next Tuesday is the standing NIFTY weekly expiry day under SEBI's post-2025-09-01 framework. Readers running their own analysis may want to track:

1. The first-hour range against the 5-day band — the data shows compressed-range sessions have historically resolved in either direction; we are not forecasting which.
2. The 9:30 AM open-interest snapshot — historically a reference point for where weekly-expiry positioning is concentrated.
3. Sectoral breadth — last week's drawdown was concentrated in financials and IT; whether that pattern persists or breaks is observable in real time.

What the dataset is not

This brief is a description of historical prints and a snapshot of realized-vol regime. It is not a forecast, not a trade plan, not a position recommendation, and not investment advice. We do not publish entry, exit, target, or stop levels. Readers should call all expiry dates against the live NSE chain and consult a SEBI-registered investment adviser before any trade.

The next dataset post lands tomorrow at 8:30 AM IST.

Sources & methodology

• NIFTY 5-minute spot bars: ICICI Direct Breeze API → historical_market_data (DynamoDB), through 2026-04-30 close.
• NIFTY weekly expiry calendar: Breeze get_nse_expiry_dates('NIFTY', year, 'OPTIDX') — sourced from NSE's meta/foCPV/expireDts API, cached in DynamoDB. Last verified expiry: 2026-04-28. May weekly schedule beyond the monthly settlement (26-May) is not present in our cached NSE response and weeklies typically follow the standing Tuesday rule under SEBI's 2025-09-01 framework — call the dates against the live NSE chain before trading.
• Realized vol: log-returns × √252, 30/90/252-day rolling windows.
• Pipeline: backend/scripts/build_monday_brief.py (uses authoritative NSE expiry calendar — no calendar guesses).
• Dataset: frontend/data/article-monday-brief.json (25.6 KB).

Numbers and methodology open. Educational analysis only.