For investors tracking the mid-cap segment, the BSE MidCap and Nifty Midcap 150 are two widely followed benchmark indices. Although both focus on mid-cap companies, they differ in exchange association, stock-selection methodology, index construction and benchmarking usage within the mutual fund industry.
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What is the BSE MidCap index?
The BSE MidCap Index is associated with the Bombay Stock Exchange (BSE) and tracks the performance of mid-cap companies that form part of the broader BSE AllCap universe.
In simple terms, the index focuses on companies that fall between large-cap and small-cap businesses in terms of market capitalisation. It uses a float-adjusted market-capitalisation weighting methodology, which means companies with a larger free-float market value generally have a higher weight in the index.
According to the factsheet dated April 2026, the index had 149 constituents. To keep the index aligned with its methodology, it undergoes annual reconstitution in September and quarterly reviews in December, March and June, during which constituent stocks are assessed against the applicable eligibility criteria.
The index offers a broad view of the mid-cap segment across a range of sectors and is commonly used as a benchmark for tracking and comparing the performance of mid-cap portfolios and investment products linked to this part of the market.
Source: BSE MidCap Factsheet (30 April 2026)
What is the Nifty Midcap 150 index?
The Nifty Midcap 150 is a benchmark index associated with the National Stock Exchange (NSE). It comprises 150 mid-cap companies and is designed to represent the mid-cap segment of the Indian equity market.
The index is derived from the Nifty 500 universe and generally includes companies ranked between 101 and 250 based on full market capitalisation. It follows a free-float market-capitalisation methodology, where constituent weights are based on the market value of shares available for trading.
The Nifty Midcap 150 offers exposure to a diversified set of mid-cap companies across sectors and is reviewed periodically in line with the index provider’s methodology. It is commonly used as a reference point for market analysis, benchmarking investment products and comparing fund performance.
Source: Nifty Midcap 150 Factsheet (29 May 2026)
BSE Midcap vs Nifty Midcap 150: At a glance
At a broad level, both indices aim to represent the mid-cap segment of the Indian equity market. However, they are linked to different exchanges and operate under separate index-construction frameworks. The BSE MidCap is associated with the Bombay Stock Exchange, while the Nifty Midcap 150 is associated with the National Stock Exchange.
Both indices are widely used as reference benchmarks for evaluating the performance of the mid-cap segment. At the same time, differences remain in stock-selection criteria, liquidity filters, weighting methodologies and periodic review mechanisms.
1. Exchange and governing body
One of the primary differences lies in the exchange ecosystem behind each index.
The BSE MidCap Index is associated with the BSE, while the Nifty Midcap 150 is associated with the NSE. As a result, the indices are governed by separate exchange and index-provider frameworks.
Although both indices represent mid-cap companies, they may not contain the same stocks in identical proportions. For mutual fund investors, this distinction is important because benchmark differences may contribute to variations in comparative fund performance across scheme factsheets.
2. Number of constituents and selection criteria
The Nifty Midcap 150 is explicitly structured as a 150-stock benchmark, as indicated by its name. However, the stock-selection frameworks differ.
According to BSE’s published methodology, the BSE MidCap index comprises companies that fall within the 70% to 85% total market-capitalisation coverage band of the eligible universe.
In addition to market-capitalisation criteria, eligible companies are generally required to have a minimum listing history of six months and a trading frequency of at least 80%. The methodology differs from the Nifty Midcap 150 framework, which generally comprises companies ranked 101–250 by full market capitalisation within the Nifty 500 universe.
As a result, although both indices seek to represent the mid-cap segment, the methodology used to select constituent stocks is not identical.
Source: Asia Index Pvt. Ltd. BSE AllCap Index Methodology; NSE Indices – Nifty Midcap 150 Index Methodology.
3. Calculation methodology and rebalancing
The methodology differences may be understood through two aspects: index construction and rebalancing.
On the BSE side, the published framework classifies companies within the BSE AllCap universe based on cumulative average daily total market capitalisation. Companies representing the first 70% of cumulative market capitalisation are classified as large-cap, the next 15% as mid-cap and the final 15% as small-cap. The BSE MidCap index is derived from the companies classified within the mid-cap segment under this framework.
The BSE MidCap index undergoes periodic reviews and annual reconstitution in line with the published methodology. On the NSE side, the Nifty Midcap 150 also undergoes periodic rebalancing and index reconstitution as part of the exchange’s review process.
Therefore, both indices are rule-based and periodically reviewed, although their methodologies and selection frameworks are not fully identical.
Source: BSE AllCap Index Methodology; NSE Indices – Nifty Midcap 150 Index Methodology.
4. Sector composition and diversification
Sector allocation is another area where the two indices may differ. Since the stock universe, weight allocation and selection methodology vary between the BSE and NSE frameworks, sector exposure may also differ across the two indices. Both indices provide exposure across multiple sectors rather than concentrating on a single segment of the market.
This distinction matters because sector composition may influence how an index responds to changing economic conditions, earnings cycles and market sentiment. For example, differences in exposure to financials, healthcare, industrials or consumer-oriented sectors may contribute to performance variation between benchmarks over time.
For investors reviewing mutual fund factsheets, this also explains why two mid-cap funds within the same category may perform differently when benchmarked against different indices.
5. Usage as a mutual fund benchmark
From a mutual fund perspective, benchmark usage is one of the more practical distinctions. While comparing mid-cap mutual funds, investors may review which benchmark a scheme uses for performance comparison. Differences in benchmark methodology may contribute to variations in relative performance outcomes even within the same fund category.
Which index should mutual fund investors review?
There is no universal preference between the BSE MidCap and the Nifty Midcap 150. A more relevant approach may be to review the benchmark used by the mutual fund scheme in its factsheet and regulatory disclosures.
For investors evaluating fund performance, benchmark alignment may be more useful than familiarity with a particular exchange brand. Reviewing the benchmark methodology, portfolio composition and long-term portfolio behaviour may provide additional context when assessing fund performance rather than focusing only on the “mid-cap” label.
Final thoughts on BSE Midcap vs Nifty Midcap 150
The BSE MidCap and Nifty Midcap 150 both track mid-cap companies, but they are not interchangeable benchmarks. They differ in exchange ecosystem, stock-selection methodology, index-construction framework, review process and mutual fund benchmark usage.
For investors, one practical takeaway is to review the benchmark that the mutual fund scheme actually follows rather than relying only on the benchmark name. This may provide additional context when evaluating fund performance and benchmark comparisons.
FAQs
What is the difference between BSE Midcap and Nifty Midcap 150?
The BSE MidCap is associated with the BSE ecosystem, while the Nifty Midcap 150 is associated with the NSE ecosystem. Their stock-selection methodology and periodic review processes also differ.
Which is better: BSE Midcap or Nifty Midcap 150?
There is no universal answer. Investors may review the benchmark used by their mutual fund scheme when comparing fund performance and portfolio characteristics.
How many stocks are in BSE Midcap and Nifty Midcap 150?
According to the April 2026 factsheet, the BSE MidCap index had 149 constituents. The Nifty Midcap 150 comprises 150 constituents.
Can I invest in BSE Midcap or Nifty Midcap 150 through mutual funds?
Both indices are used as reference benchmarks within the mutual fund industry. In addition, passive investment products linked to these indices may be available in the market, subject to prevailing market offerings.
