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Sensex

Also written BSE Sensex · S&P BSE Sensex

BSE's benchmark index of 30 large companies, the oldest and best-known bellwether of Indian equity markets, based at a value of 100 in 1979.

In plain language

When Indian financial news says "the market" moved, it usually means the Sensex.

The Sensex is BSE's benchmark index. It tracks 30 large, established companies. People call it a bellwether — a general sign of what Indian equity markets are doing. It is not a precise measure of every listed company's fortunes. It just shows the broad direction.

How it works

The Sensex was set at a base value of 100 in 1979. By 30 January 2026 it had grown to a level of 82,269 — an appreciation of roughly 15.4% a year, compounded annually, before adding back dividends investors received along the way.

As an index used across the paper, the Sensex appears repeatedly: as an equity benchmark for scheme performance disclosures, as one input in synthetic (blended) indices built for hybrid and international funds, and as one of the reference indices for a market capitalisation weighted approach, though the workbook notes that major Indian indices, including the Sensex, have since moved to a free-float weighting basis.

A worked example

An investor who put Rs 1,00,000 notionally into the Sensex in 1979, when it stood at 100, would — purely on the index's price appreciation to 82,269 by 30 January 2026, ignoring dividends and any real-world costs of tracking the index — see that notional value grow to roughly:

Rs 1,00,000 × (82,269 ÷ 100) = Rs 8,22,69,000

That is a 15.4% annually compounded price return over the period, before dividends are added — the workbook's own figures for illustrating how a long-run equity benchmark compounds, and why equity scheme performance is so often measured against it.

Why NISM asks about it

Chapter 1 (Investment Landscape) introduces the Sensex's base value, current level and long-run compounded return as the illustration of equity's long-term return potential. Chapter 11 uses it as a standard equity benchmark for scheme performance disclosures, and Chapter 2 references it in hybrid-fund synthetic index construction. Expect a question on the base year and base value, or on the compounded annual growth figure.

Common exam traps

  • The 15.4% figure is before dividends — total returns including dividends would be higher, which is exactly why a Total Return Index variant is used for formal scheme benchmarking rather than the plain price index.
  • The Sensex tracks 30 large companies, not the whole market — it is a bellwether, not a complete picture.
  • The base value of 100 dates to 1979 — do not confuse this with the base year or value of other, more recently constructed indices.
  • Major Indian indices, the Sensex included, are now free-float weighted, not the older market-capitalisation-weighted method some workbook passages describe historically.

Check yourself

  1. 1.Why are the S&P BSE Sensex and Nifty 50 inappropriate as benchmarks for a mid-cap fund?

    1. a)They are Price Return Indices and so cannot be used at all
    2. b)They are calculated on 30 and 50 large companies respectively, so midcap indices such as Nifty Midcap 50 or S&P BSE Midcap are better benchmarks
    3. c)They are not published regularly enough
    4. d)They are only permitted for debt schemes
    Show the answer

    Answer: (b) They are calculated on 30 and 50 large companies respectively, so midcap indices such as Nifty Midcap 50 or S&P BSE Midcap are better benchmarks

    "S&P BSE Sensex and Nifty 50 indices are calculated based on 30 (in the case of Sensex) / 50 (in the case of Nifty) LARGE COMPANIES. Thus, these indices are APPROPRIATE BENCHMARKS FOR THOSE EQUITY FUNDS THAT INVEST IN LARGE COMPANIES. For MIDCAP FUNDS midcap indices such as NIFTY MIDCAP 50 or S&P BSE MIDCAP are considered as BETTER BENCHMARKS." The chapter names four drivers of the choice in equity schemes — scheme type, choice of investment universe, portfolio concentration and underlying exposure. On type, "sectoral/thematic funds select SECTORAL/THEMATIC indices such as S&P BSE Bankex, S&P BSE FMCG Index, Nifty Infrastructure Index and Nifty Energy Index." On concentration, funds holding fewer stocks suit narrow indices like the Sensex and Nifty 50, while funds holding more suit broader ones — "S&P BSE 100/Nifty 100 (based on 100 stocks), S&P BSE 200/Nifty 200 (200 stocks) and S&P BSE 500/Nifty 500 (500 stocks)." Option (a) confuses the point: Sensex and Nifty do have TRI variants, and every benchmark must now be a TRI.

  2. 2.Which statement about passive funds is correct?

    1. a)They aim to outperform the index they track
    2. b)They invest on the basis of a specified index, hold only its constituents in the index weights, and have low running costs because the manager has no role in deciding investments
    3. c)They are actively managed within the parameters of an index
    4. d)They have higher expenses than actively managed funds
    Show the answer

    Answer: (b) They invest on the basis of a specified index, hold only its constituents in the index weights, and have low running costs because the manager has no role in deciding investments

    "Passive funds invest on the basis of a SPECIFIED INDEX, whose performance it seeks to track. Thus, a passive fund tracking the S&P BSE Sensex would buy ONLY the shares that are part of the composition of the S&P BSE Sensex. The proportion of each share in the scheme's portfolio would also be THE SAME as the weightage assigned to the share in the index... They are NOT DESIGNED TO PERFORM BETTER THAN THE MARKET... Since the portfolio is determined by the index itself, THE FUND MANAGER HAS NO ROLE in deciding on investments. Therefore, these schemes have LOW RUNNING COSTS." Options (a) and (d) both describe active funds, where "the fund manager has the FLEXIBILITY to choose the investment portfolio", expenses are higher, and "investors expect actively managed funds to perform better than the market." Note SEBI's MF Lite framework, introduced as on 31 December 2024, covering funds holding only index funds, ETFs, fund of funds or other specified schemes.

  3. 3.What do the three I-Bex sub-indices cover?

    1. a)Si-Bex 1–5 years, Mi-Bex 5–10 years, Li-Bex above 10 years
    2. b)Si-Bex 1–3 years, Mi-Bex 3–7 years, Li-Bex more than 7 years
    3. c)Si-Bex corporate bonds, Mi-Bex money market, Li-Bex gilts
    4. d)Si-Bex 91 days, Mi-Bex 1 year, Li-Bex 10 years
    Show the answer

    Answer: (b) Si-Bex 1–3 years, Mi-Bex 3–7 years, Li-Bex more than 7 years

    "ICICI Securities' SOVEREIGN BOND INDEX (I-Bex) is BASED ON GOVERNMENT SECURITIES. It consists of an UMBRELLA INDEX covering the entire market, and SUB-INDICES catering to THREE CONTIGUOUS MATURITY BUCKETS. The three sub-indices are — Si-Bex (1 TO 3 YEARS), Mi-Bex (3 TO 7 YEARS) and Li-Bex (MORE THAN 7 YEARS)." All three are built on government securities, which is why option (c) fails. The prefixes are a memory aid — Short, Medium, Long. The I-Bex family matters beyond gilt funds: the chapter's hybrid example uses "65 percent of S&P BSE Sensex and 35 percent of I-Bex." Remember the related rule from the same section: "the benchmark for DEBT (and BALANCED schemes) SHOULD BE DEVELOPED BY RESEARCH AND RATING AGENCIES RECOMMENDED BY AMFI. CRISIL, ICICI SECURITIES AND NSE have developed various such indices."

Where this is taught

Free preparation for NISM Series V-D

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