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What is Nifty Alpha 50 Index?
The Nifty Alpha 50 Index is a strategy index that comprises 50 stocks with the highest alpha scores among the top 300 NSE-listed stocks ranked on the basis of their free-float market capitalisation. The key aim of this index is to measure and track the performance of National Stock Exchange-listed stocks that have achieved high Alpha scores in the past year.
High alpha stocks or stocks with high Jensen Alpha score can be defined as securities that have significantly outperformed their chosen benchmark. The alpha score of individual stocks is calculated using the Jensen's Alpha formula.
A positive Jensen Alpha score denotes outperformance vs the benchmark. What's more, the weight of individual stocks on this Index is also assigned based on the alpha score of stock. So, the stocks with the highest alpha score are assigned the greatest weight on this index.
What is Stock Selection Methodology for Nifty Alpha 50 Index?
There are a few key criteria that an equity stock needs to fulfill for inclusion into the Nifty Alpha 50 Index:
Once a list of eligible stocks is obtained as per the above-mentioned criteria, the alpha of individual stocks is calculated using the 1-year trailing prices methodology after making adjustments for corporate actions. Next these stocks are ranked in descending order on the basis of their Alpha scores.
The 50 stocks in this list with the highest alpha scores are then selected for inclusion into the Nifty Alpha 50 Index. This is not an equal weight index and the weight of each stock is determined on the basis of the alpha score achieved by the individual stock.
This index undergoes quarterly rebalancing, at which time new stocks can become part of the Nifty Alpha 50 Index at the expense of relatively poorly performing current constituent stocks. This quarterly rebalancing is carried out using data of the previous 6-month period ending in the last trading day of February, May, August and November every year.
What makes Nifty Alpha 50 Special?
The formula based approach of the Nifty Alpha 50 index effectively adapts to changing market conditions, especially during volatile markets. As seen in Q4, FY24, the index reduced its exposure in small cap category, given sharp correction in the segment, delivering FY24 returns of 83%. Historical market cap allocation of the index is shared below.
| Scheme Type | Sep-21 | Dec-21 | Mar-22 | Jun-22 | Sep-22 | Dec-22 | Mar-23 | Jun-23 | Sep-23 | Dec-23 | Mar-24 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Large cap | 37% | 33% | 15% | 12% | 47% | 41% | 37% | 31% | 17% | 27% | 36% |
| Mid cap | 41% | 40% | 33% | 45% | 41% | 40% | 56% | 46% | 50% | 44% | 49% |
| Small cap | 22% | 27% | 52% | 43% | 13% | 19% | 6% | 22% | 34% | 29% | 15% |
What are the Constituent Stocks of the Nifty Alpha 50?
As mentioned earlier, the Nifty Alpha 50 Index consists of 50 stocks which are assigned different weights based on their individual Jensen's Alpha scores. Below is a snapshot of the top 10 stocks included in the index as of 29th August 2025 along with their individual weights:
| Security Name | % Weight in Index |
|---|---|
| One 97 Communications Ltd. | 6.92 |
| BSE Ltd. | 4.74 |
| PG Electroplast Ltd. | 4.31 |
| Firstsource Solutions Ltd. | 3.50 |
| Mazagoan Dock Shipbuilders Ltd. | 3.43 |
| Amber Enterprises India Ltd. | 3.32 |
| Reliance Power Ltd. | 3.17 |
| GE Vernova T&D India Ltd. | 3.05 |
| Coromandel International Ltd. | 2.97 |
| Hitachi Energy India Ltd. | 2.97 |


