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The Sensex, Explained

beginner5 min read

The 30-stock index that India watches every evening, and how it differs from the Nifty.

The SensexA basket of stocks tracked together to represent a market. is the BSE’s benchmark — 30 large, established companies. It’s India’s oldest indexA basket of stocks tracked together to represent a market. (since 1979) and the number TV anchors quote every evening.

NiftyA basket of stocks tracked together to represent a market. (50 stocks, NSE) and SensexA basket of stocks tracked together to represent a market. (30 stocks, BSE) overlap heavily and move almost in lockstep — both are large-capThe biggest, most established listed companies., free-float-weighted gauges of the same market. The difference is mostly the number of constituents and the exchangeA regulated marketplace where shares are bought and sold..

Don’t agonise over NiftyA basket of stocks tracked together to represent a market. vs SensexA basket of stocks tracked together to represent a market. — they tell virtually the same story. Pick one as your benchmark and stay consistent. Obsessing over the tiny daily gapA jump between one bar’s close and the next bar’s open. between them is noise, not insight.
Key takeawayThe SensexA basket of stocks tracked together to represent a market. is the BSE’s 30-stock large-capThe biggest, most established listed companies. benchmark; it moves almost identically to the NiftyA basket of stocks tracked together to represent a market. 50 — the choice between them barely matters.
FAQs
Why do Sensex and Nifty sometimes move by different percentages?

Different constituent counts (30 vs 50) and weights mean small divergences, but they track the same large-cap universe and rarely disagree on direction. Over time their returns are nearly identical.