The Nifty Midcap 100 is a broad-market stock market index designed to track the performance of the midcap segment of companies listed on the National Stock Exchange (NSE). It consists of 100 tradable stocks and uses the free-float market capitalisation method to calculate its index value. Because companies can move up or down the market-capitalisation and liquidity rankings over time, the index requires periodic review and rebalancing to maintain its intended representation of the midcap segment.
Factors in Play for Index Review
The Nifty Midcap 100 constituents are reviewed and rebalanced semi-annually, meaning the index is generally reconstituted twice a year. According to NSE Indices, the reconstitution is effective on the last working day of March and September.
1] Examining the Process:
The review process helps NSE Indices assess whether existing companies continue to satisfy the applicable eligibility requirements and whether other companies should be included. NSE Indices explains that regular index reviews are necessary because capital markets are dynamic and the relative position of companies can change. For broad-market indices, the eligibility pool is prepared using data for periods ending January 31 and July 31, which supports the semi-annual review process.
2] Understanding the Channels:
For the Nifty Midcap 100, constituent selection also involves the Nifty Midcap 50 and Nifty Midcap 150 frameworks. The index methodology states that companies from the Nifty Midcap 50 are included, while additional securities can qualify based on average daily turnover rankings among constituents of the Nifty Midcap 150. Existing constituents can be removed if their liquidity ranking falls below the specified threshold or if they are excluded from the Nifty Midcap 150.
3] Merging Stocks with Real Prices:
Rebalancing therefore does not simply mean replacing stocks based on their share price performance. Factors such as market classification, liquidity, eligibility and changes in the underlying index universe can influence constituent changes. The process is designed to keep the index aligned with its objective of representing the midcap segment rather than tracking a fixed list of companies indefinitely.
4] Hitting Target Investors:
Investors should also understand that a scheduled semi-annual review does not mean changes can never occur between review dates. NSE Indices may conduct additional reviews when required, including situations involving events such as schemes of arrangement, suspension or delisting.
Conclusion
For investors tracking the Nifty Midcap 100, the semi-annual review schedule is therefore an important part of understanding changes in the index. A company that enters or exits the index may also affect index funds, exchange-traded funds and other investment products that use the index as a benchmark. However, constituent changes should be viewed as part of the index-maintenance process rather than as an independent indication of future stock performance.
