Equal Weight Index Funds: Mechanics, Costs and Risks
An equal weight index fund gives every stock in the index the same weight instead of sizing positions by market capitalisation. In the Nifty50 Equal Weight index each of the 50 companies gets 2 percent of the portfolio, and in the Nifty 100 Equal Weight index each of the 100 gets 1 percent, reset at every scheduled rebalance.
That single change matters more than it sounds. In the standard free float market cap version of the Nifty 50, the ten largest names can account for more than half the index, so your return is mostly decided by a handful of companies. Equal weighting breaks that concentration and quietly raises your exposure to the smaller, more volatile members of the same list.
How equal weighting changes the portfolio
Start with the arithmetic. If a stock is 11 percent of the cap weighted Nifty 50 and you move to equal weight, its weight drops to 2 percent. A stock sitting at 0.4 percent gets multiplied five times over. The index still owns exactly the same 50 companies, but the return drivers are completely different.
Because the smaller members of a large cap index behave a bit like mid caps, the equal weight version usually shows higher volatility and a higher beta than the parent index. It is not a lower risk product. It is a different risk mix.
Sector effects nobody plans for
Cap weighting concentrates the Nifty 50 in financials, IT and energy. Equal weighting flattens that and mechanically lifts sectors that have many mid sized constituents, such as autos, cement, metals and consumer names. You inherit that sector bet as a side effect of the weighting rule.
The rebalance is the strategy
Both the Nifty50 Equal Weight and the Nifty 100 Equal Weight indices are rebalanced quarterly. Between reviews, weights drift with prices. At the review, everything is pushed back to the target.
That reset is systematic profit taking. A stock that doubled over the quarter is trimmed back to 2 percent, and a stock that fell is topped up. Over full cycles this contrarian trade has helped in broad markets where leadership rotates. It hurts badly when one or two mega caps trend for years, because the rule keeps selling exactly the winner you needed to hold.
Turnover, cost and tracking
Resetting 50 or 100 positions four times a year generates far more trading than a cap weighted index, which mostly needs adjusting only when constituents change. Every rebalance trade pays brokerage, securities transaction tax on delivery, exchange and clearing charges, and impact cost.
- Expense ratio: equal weight schemes usually cost more than the cheapest Nifty 50 index funds. Direct plans are materially cheaper than regular plans, and the current number is in the scheme information document.
- Impact cost: buying the same rupee amount of a small constituent as of a giant one means trading a much larger share of that stock’s daily volume.
- Tracking difference: the sum of expenses and trading friction, which is why the fund lands below the published index return.
None of this rules out the category. It is a reason to compare tracking difference between two equal weight funds rather than headline returns.
Comparing the three weighting rules
| Feature | Nifty 50 | Nifty50 Equal Weight | Nifty 100 Equal Weight |
|---|---|---|---|
| Constituents | 50 | Same 50 | 100 |
| Weight per stock | Free float market cap | 2 percent at reset | 1 percent at reset |
| Rebalance | Weights drift with price | Quarterly reset | Quarterly reset |
| Concentration | High, top 10 dominate | Low by design | Lowest of the three |
| Typical volatility | Base case | Higher than base | Higher, with a mid cap flavour |
When equal weight underperforms
Indian markets go through long narrow phases where a few very large companies carry the index. In those phases a cap weighted Nifty 50 fund wins and the equal weight version looks broken. Nothing is broken. The rule is doing what it promised, which is refusing to hold an oversized position in whatever is working.
Drawdowns are the second issue. In a sharp correction the smaller constituents usually fall harder, so equal weight portfolios tend to lose more from peak to trough than the parent index. If you plan to hold one, assume the ride is bumpier.
The misconception to kill is the idea that equal weight equals diversified equals safer. Spreading money evenly across 50 stocks removes single stock concentration, and at the same time adds weight to the least stable members of the list. Those two effects do not cancel out in your favour automatically.
Frequently Asked Questions
Does an equal weight fund beat the Nifty 50 over the long run?
Sometimes over long windows and not over others, and the result is very sensitive to the start and end dates you pick. Treat it as a different exposure to the same universe, not as an upgrade.
Is the Nifty 100 Equal Weight fund a large cap or mid cap product?
The universe is large cap by SEBI market cap ranking, since the Nifty 100 covers the top 100 companies. The behaviour sits somewhere between large and mid cap because the smaller names get the same 1 percent as the giants.
Why is the fund return lower than the index return on the AMC website?
The index is a theoretical number with no costs. The fund pays expense ratio, transaction taxes and impact cost, especially at each quarterly reset. That gap is the tracking difference, and it should be small and stable rather than erratic.
Should I hold both a Nifty 50 fund and an equal weight fund?
Many investors do, because the two overlap in holdings but not in return pattern. If you do, decide the split in advance and stick to it, since chasing whichever one led last year defeats the purpose.
Key Takeaways
- Equal weight indices give every constituent the same weight and reset it quarterly.
- The reset is a contrarian trade that trims winners and adds to laggards.
- Higher turnover means higher cost, so compare tracking difference between funds.
- Expect deeper drawdowns and underperformance when a few mega caps lead the market.
- Diversified by count does not mean lower risk, because smaller members get outsized weight.
