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Market Structure
Updated 2025-06-04·Editorial policy·Trading system

What is Sensex?

S&P BSE Sensex is 30-stock index — India’s widely cited benchmark with long history.

Formula

Sensex Calculation: Index = (Free-Float Market Cap / Base Market Cap) × 100 Free-Float Methodology: - Counts only publicly tradable shares - Excludes promoter holdings - Larger companies have more weight Historical Milestones: 1979: Base of 100 1992: Crossed 4,000 2006: Crossed 10,000 2014: Crossed 25,000 2021: Crossed 50,000 2024: ~75,000

Indian market context (NSE)

Reference levels: Nifty 50 at 24,300, Reliance Industries at ₹1,300, Bank Nifty futures at 55,000 (lot size 30). Examples below show how Sensex shows up on Indian index, equity, and futures books — update to live quotes in your journal.

Nifty 50 perspective

Sensex in Indian context at Nifty 24,300: apply SEBI/regulatory framing where relevant and tag index trades separately in weekly review.

Reliance Industries perspective

Sensex using Reliance at ₹1,300 as a liquid large-cap example — adjust numbers to your live quote and contract note.

Bank Nifty futures perspective

Sensex with Bank Nifty futures at 55,000 — respect lot size 30 and quarterly vs monthly contract rules on NSE.

How to validate

  • Validate Sensex readings by session tag — open hour stats differ from midday.
  • Check behaviour on gap-up/gap-down days separately on Nifty tags.
  • Correlate with India VIX buckets (calm vs elevated) before changing rules.
  • Confirm liquidity notes were filled on fast-market days.

How to track in TradeLyser

  • Tag session phase and liquidity state on each trade influenced by Sensex.
  • Daily journal: one line on market structure context (gap, range, trend).
  • Filter analytics by session tag during monthly review.
  • Note India VIX at session open when structure rules depend on volatility.

Best practices

  • Pre-define how Sensex maps to session tags each quarter.
  • Reduce size on expiry and event sessions when structure breaks.
  • Journal gap days explicitly — averages hide gap risk.
  • Align structure tags with India cash session hours (9:15–15:30).

Common pitfalls

  • Applying midday rules to the opening 15 minutes without adjustment.
  • Trading illiquid names with the same Sensex assumptions as Nifty.
  • Forgetting overnight gap risk on “intraday” tags.
  • Over-tagging — so many structure labels that review becomes noise.

How to use this in TradeLyser

Daily journal optional Sensex % alongside Nifty for macro context.

Related terms

FAQ

Trade Sensex futures?

BSE index products exist — tag instrument explicitly.

Sensex vs Nifty beta?

Usually high correlation — note divergences.

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