Definition
Equal-Weight Index
An equal-weight index assigns the same weight to every constituent regardless of company size, in contrast to cap-weighting where the largest firms dominate.
An Indian equal-weight index, such as Nifty50 Equal Weight, gives each of the 50 stocks the same 2% target weight at rebalancing. This reduces concentration in mega-caps and gives small constituents more influence, producing a built-in size tilt and a contrarian rebalancing discipline.
Equal weighting forces the index, and any tracking fund, to periodically sell winners and buy laggards to restore equal weights, raising turnover versus cap-weighted indices. It can outperform when smaller constituents lead and underperform when a few mega-caps dominate, making it a popular smart-beta approach.
Related terms
- Smart BetaSmart beta refers to rules-based index strategies that weight securities by factors or alternative metrics rather than by market capitalisation, aiming to improve returns or reduce risk versus a plain cap-weighted index.
- Size FactorThe size factor reflects the historical tendency for smaller-capitalisation stocks to outperform larger ones over the long run, compensating investors for their higher risk and lower liquidity.
- Index RebalancingIndex rebalancing is the periodic adjustment of constituent weights back to their methodology-defined levels, accounting for price moves, capping limits and corporate actions, without necessarily changing the membership.
- Capping (Index)Capping is an index rule that limits the maximum weight any single constituent, or group such as a sector, can have, preventing excessive concentration and ensuring diversification.
Plain-English explainer from The Dispatch Investors Encyclopedia. General information, not financial advice.