BSE 100 TRI (Total Returns Index)

The BSE 100 Total Returns Index (BSE 100 TRI) is the dividend-reinvested variant of the BSE 100 index, a free-float market capitalisation-weighted index of the 100 largest and most liquid companies listed on the Bombay Stock Exchange (BSE). Published by BSE Limited, India’s oldest stock exchange, the BSE 100 TRI provides a broader large-cap benchmark than the NIFTY 50 TRI, extending coverage from 50 to 100 companies while retaining a large-cap orientation. It is widely used as the primary benchmark for SEBI-categorised large-cap equity mutual fund schemes that prefer the BSE family of indices, as well as for large-and-midcap funds seeking a broader top-tier universe.

The BSE 100 index dates its origins to 1984, predating the formation of the NIFTY 50 by more than a decade, and carries with it a long tradition as the broad large-cap barometer of the Indian equity market. Its longer history also provides a richer dataset for long-run return analysis. When SEBI mandated TRI benchmarks for all equity mutual funds in 2018, the BSE 100 TRI became the second most widely used large-cap benchmark after the NIFTY 50 TRI.

Publisher and governance

The BSE 100 TRI is published and administered by BSE Limited (formerly the Bombay Stock Exchange), established in 1875 as Asia’s oldest stock exchange. BSE Limited’s index services division maintains the methodology, oversees constituent selection, and handles all corporate action adjustments. Index calculation occurs in real time during trading hours, and the index level is disseminated through BSE’s data feeds and licensed data vendors.

BSE Limited also maintains the SENSEX (the 30-stock flagship index), the BSE 500 TRI (broad market), BSE MidCap, BSE SmallCap, and a comprehensive family of sectoral and thematic indices. The BSE 100 sits within this family as the standard large-cap reference covering the top 100 companies.

BSE Limited licenses the BSE 100 TRI to AMCs, ETF sponsors, data vendors (Bloomberg, Refinitiv, Morningstar), and institutional investors. As with the NIFTY 50 TRI, the licensing terms require accurate attribution, methodology disclosure, and compliance with BSE’s index governance standards.

History and base date

The BSE 100 index was introduced with a base date of 3 April 1984 and a base value of 100. The index was historically known as the BSE National Index, reflecting its origins as an index designed to represent the Indian equity market at the national level, beyond the BSE-centric SENSEX. It was rebranded as the BSE 100 in the early 2000s to align with the international naming convention for large-cap indices.

The total returns variant was introduced and back-calculated to the base date of 3 April 1984, enabling consistent long-run analysis. The near-four-decade history of the BSE 100 TRI encompasses:

• The liberalisation era of the early 1990s.
• The 1992 Harshad Mehta securities scam and subsequent regulatory reforms.
• The technology bubble of 1999-2000 and the subsequent crash.
• The global commodities boom of 2003-07.
• The global financial crisis of 2008-09.
• India’s domestic growth acceleration in 2014-18.
• The Covid-19 pandemic shock and recovery in 2020-21.
• The post-pandemic normalisation and rate tightening cycle of 2022-24.

As with the NIFTY 50 TRI, the mandatory shift to TRI benchmarking for Indian mutual funds came through SEBI’s circular of 4 January 2018, which required all equity scheme benchmarks to be expressed in total return terms from 1 February 2018.

Index construction and methodology

Constituent universe

The BSE 100 index covers the 100 largest companies listed on BSE, selected through a multi-criteria process:

Free-float market capitalisation rank: companies are ranked by their free-float adjusted market capitalisation. The top 100 eligible companies constitute the index. Free-float adjustment means that only shares genuinely available for trading – excluding promoter holdings, government shareholdings above defined thresholds, strategic investor locks, and cross-holdings – are counted.

Liquidity screening: constituents must satisfy minimum trading frequency and impact cost thresholds over the preceding review period. Companies with very thin trading volumes, even if their market capitalisation is large, may be excluded on liquidity grounds.

Listing history: a minimum of three months of trading history on BSE is generally required.

Financial health screens: companies under insolvency proceedings, with regulatory restrictions on trading, or with suspended trading are excluded regardless of market capitalisation.

Sector restrictions: BSE Limited’s methodology does not impose sector quotas on the BSE 100, but reserves the right to exclude specific categories of companies based on broader governance decisions.

Weighting methodology

The BSE 100 uses free-float market capitalisation weighting. Each company’s weight is proportional to its free-float adjusted market capitalisation relative to the total free-float market capitalisation of all 100 constituents. BSE Limited applies a capping rule to prevent excessive concentration at the time of rebalancing: no single stock may exceed a specified weight cap.

In practice, the top five companies in the BSE 100 (typically Reliance Industries, HDFC Bank, ICICI Bank, TCS, and Infosys) account for approximately 30-40% of the total index weight. The 51st to 100th ranked companies carry much smaller individual weights (often 0.2-0.8% each), but collectively their inclusion affects the index’s sectoral composition relative to a 50-stock index.

Rebalancing

The BSE 100 is reconstituted semi-annually, typically in June and December. BSE’s Index Maintenance Sub-Committee reviews eligible companies against the selection criteria and announces changes with approximately three to four weeks’ advance notice for market participants. Intra-period changes may occur due to delistings, mergers, or other corporate events that affect eligibility.

Corporate action adjustments

The TRI adjusts for all standard corporate actions:

TRI versus PRI distinction

The price return index (PRI) version of BSE 100 captures only the capital gain component of total equity return. The total returns index (TRI) adds dividend income.

Historically, the dividend yield of the BSE 100 has averaged in the range of 1.0-1.6% per annum. The precise yield depends on the payout policies of the 100 constituent companies at any given time. Large FMCG companies (HUL, ITC), IT services exporters (TCS, Infosys), and established industrial conglomerates tend to be consistent dividend payers. Younger, high-growth technology companies, private sector banks reinvesting for loan book growth, and infrastructure companies with high capital expenditure needs tend to pay lower or no dividends.

Over a ten-year horizon, a 1.0-1.6% annual dividend yield implies a compounded differential of approximately 11-17 percentage points between the TRI and PRI levels. This is not trivial: a fund that matched the BSE 100 PRI over 10 years but is compared against the TRI would appear to have underperformed by 11-17 percentage points in total, or roughly 1.0-1.5% per year annualised.

For mutual fund regulation purposes, SEBI’s 2018 mandate means that schemes benchmarked to the BSE 100 must use the BSE 100 TRI exclusively in all offer documents, scheme information documents (SIDs), key information memoranda (KIMs), and fact sheets. Comparisons using the PRI are no longer permissible in investor-facing documents.

Sectoral composition

The BSE 100’s sectoral weights are broadly similar to those of the NIFTY 50 but reflect slightly higher exposure to sectors where companies ranking 51-100 by market capitalisation are concentrated. These tend to be sectors with a deeper mid-to-large cap population: capital goods (where the 51-100 band includes significant engineering companies), specialty chemicals, healthcare services, and consumer durables.

Approximate sectoral breakdown as of 2024-25:

The broader coverage compared to the NIFTY 50 means the BSE 100 has slightly higher weight in sectors like capital goods, specialty chemicals, and consumer durables, where several companies rank in the 51-100 size band.

Historical returns

Approximate CAGR of the BSE 100 TRI over various periods:

The BSE 100 TRI and NIFTY 50 TRI are highly correlated given their overlapping constituent bases; the top 50 BSE companies by market capitalisation overlap substantially with the NIFTY 50 universe (the sets are not identical because NSE and BSE maintain separate eligibility criteria and free-float estimates, but the overlap is large). Short-term divergences reflect the incremental performance of companies ranked 51-100 relative to the top 50.

Over long periods (10+ years), the BSE 100 TRI has marginally outperformed the NIFTY 50 TRI because the 51-100 band contains faster-growing companies that have progressively increased their market capitalisation. However, this margin is typically small – 20-50 basis points per year – and is swamped by short-term tracking deviations.

Mutual fund schemes using BSE 100 TRI as benchmark

SEBI’s categorisation framework defines large-cap companies as those in the top 100 by full market capitalisation on a combined NSE-BSE ranking, updated by AMFI every six months. Both the NIFTY 50 TRI and BSE 100 TRI are therefore approved benchmarks for the SEBI-defined large-cap category; the choice between them is made by each AMC based on commercial preference, data infrastructure, and historical practice.

AMCs that have historically used BSE benchmarks (either the SENSEX or BSE 100) include Kotak Mahindra AMC, Mirae Asset, Franklin Templeton India, Tata Mutual Fund, and others.

Specific scheme categories using BSE 100 TRI:

• Large-cap equity funds: the BSE 100 TRI is used as the benchmark by large-cap funds that prefer the BSE universe. Examples include Mirae Asset Large Cap Fund, Franklin India Bluechip Fund, Kotak Bluechip Fund, and Tata Large Cap Fund.
• Large-and-midcap equity funds: SEBI’s large-and-midcap category requires investment across the top 250 companies. Some AMCs use the BSE 100 TRI as one benchmark and a midcap index as a secondary benchmark, or use a blended composite.
• BSE 100 index funds and ETFs: dedicated passive products. Examples include Nippon India BSE 100 ETF, Kotak BSE Midcap Select Index Fund variants.

Index fund and ETF ecosystem

While the NIFTY 50 has a larger passive replication ecosystem, several fund houses offer BSE 100-tracking products:

• BSE 100 Index Funds: mutual fund schemes that track the BSE 100 TRI, typically with TERs of 0.10-0.30% for direct plans.
• BSE 100 ETFs: exchange-traded products for investors who prefer intraday liquidity.
• BSE-based target maturity structures: some AMCs use BSE-family equity indices in structured products.

The BSE 100 index fund/ETF ecosystem is smaller than the NIFTY 50 equivalent in terms of AUM and liquidity, but provides an alternative for investors who seek slightly broader large-cap exposure.

Comparison with related indices

The BSE 100 TRI sits between the SENSEX TRI and BSE 500 TRI in terms of breadth, offering a middle ground between the narrow blue-chip focus of the 30-stock SENSEX and the comprehensive market coverage of the 500-stock index.

BSE versus NSE: index family differences

A common question for investors is whether the BSE 100 TRI and NIFTY 50 TRI are interchangeable. The key differences are:

1. Constituent count: BSE 100 (100 companies) versus NIFTY 50 (50 companies). The extra 50 companies in the BSE 100 provide marginally greater diversification.
2. Exchange affiliation: BSE 100 reflects BSE-listed companies; NIFTY 50 reflects NSE-listed companies. In practice, most large-cap Indian companies are listed on both exchanges, so the overlap is high.
3. Free-float estimates: NSE Indices and BSE Limited may produce slightly different free-float estimates for the same company, leading to small weighting differences.
4. Methodology details: the impact cost threshold, eligibility criteria, and capping rules differ slightly between the two index families.
5. History: BSE 100 (base 1984) has a longer documented history than NIFTY 50 (base 1995).

For most practical investment purposes, the choice between a BSE 100 TRI-benchmarked fund and a NIFTY 50 TRI-benchmarked fund is not materially significant – both provide large-cap India equity exposure at similar cost and with high mutual correlation.

Licensing

BSE Limited licenses the BSE 100 TRI under its standard index licensing framework to AMCs, index fund managers, ETF sponsors, data vendors, and financial institutions. The licensing framework is governed by BSE’s standard index licensing agreements, which include provisions for attribution, calculation agent confirmation, and replication accuracy standards.

See also

• Bombay Stock Exchange
• SENSEX
• BSE 500 TRI
• NIFTY 50 TRI
• NIFTY 500 TRI
• NIFTY Midcap 150 TRI
• Equity ETF (India)
• Mutual fund
• AMFI
• National Stock Exchange of India

References

1. BSE Limited. “BSE 100 Index Methodology.” bseindia.com. Accessed 2026.
2. SEBI. Circular SEBI/HO/IMD/DF3/CIR/P/2018/04, dated 4 January 2018, on total return indices as mutual fund benchmarks.
3. BSE Limited. “BSE 100 Fact Sheet.” bseindia.com. 2025.
4. AMFI. “Category-wise benchmark mapping for equity mutual funds.” amfiindia.com. 2025.
5. SEBI. Circular SEBI/HO/IMD/DF3/CIR/P/2017/114 on mutual fund scheme categorisation, dated 6 October 2017.
6. NSE Indices Limited. “NIFTY 50 vs BSE 100 comparative analysis.” niftyindices.com. 2024.