How to Tell If Your Active Fund Is Truly Active or Closet Indexing
To tell if your active fund is really active, compute its active share against the benchmark and check the tracking error over 3 to 5 years. An active share above 70 percent and tracking error above 4 percent suggest a genuinely active strategy.
Roughly one in three actively managed equity funds is closer to an expensive index fund than a real active strategy. That is what serious academic studies of fund holdings have found across global markets. The technical name is closet indexing, and it is one of the quiet ways investors lose money without ever seeing a single bad headline. If you have spent any time reading about what is passive investing, you already know that fees matter. The closet index problem is worse than fees alone, because you are paying active fees while getting passive performance.
The good news is that you can check this yourself. The data is public. The math is simple. Here is the full walk-through.
What closet indexing actually means
A truly active equity fund tries to beat its benchmark by holding a different mix of stocks. Different weights, different names, sometimes different sectors. A closet indexing fund hugs the benchmark. It holds many of the same stocks at almost the same weights, then charges 1 to 2 percent a year for the privilege.
Why it happens
Asset managers are paid on the assets they manage. Underperforming the index by a lot is a quick way to lose those assets. So some managers quietly stay close to the benchmark to avoid being fired. The investor pays for active management but receives an index in disguise.
Why it matters
If you hold a closet index fund for 20 years, the gap between its expense ratio and an honest index fund can compound to a 15 to 25 percent loss in final corpus. That is silent damage. Nobody calls you to apologise for it.
The two main numbers that expose closet indexing
Two simple measures, used together, do most of the work.
1. Active share
Active share measures how much your fund's holdings differ from the benchmark. The maximum is 100 percent, which means no overlap at all. The minimum is 0 percent, which means an exact replica.
- Below 60 percent: very likely closet indexing.
- 60 to 80 percent: moderately active, fees should be moderate too.
- Above 80 percent: genuinely active, and worth a higher fee if performance justifies it.
2. Tracking error
Tracking error measures how much the fund's returns wobble around the benchmark over time. A very low tracking error, say under 2 percent, suggests the fund is shadowing the index.
Step by step: how to do the closet index check yourself
You do not need to be an analyst. The process takes 30 to 45 minutes per fund.
Step 1: pull the latest holdings disclosure
Indian mutual funds disclose their full portfolios monthly. Look on the AMC website under fact sheets or portfolio disclosures.
Step 2: pull the benchmark constituents
The Nifty 50 and Nifty 500 constituents and weights are available on the NSE website. Visit nseindia.com and search the index page.
Step 3: line up the top 50 holdings
Place the fund's top 50 holdings and weights next to the benchmark's. A closet indexer will share 30 to 40 of those names, often within a percentage point or two on weight.
Step 4: compute the active share
For each stock in the fund or benchmark, take the absolute difference in weight. Sum all differences. Divide by 2. The result is the active share. A simple spreadsheet does this in a minute.
Step 5: check tracking error over 3 to 5 years
Most fund fact sheets disclose tracking error directly. If not, you can compute the standard deviation of monthly returns of the fund minus the benchmark over 36 to 60 months. Anything below 2 percent in a large-cap fund is suspicious for an active strategy.
What good active funds look like in numbers
| Signal | Genuine active | Closet index |
|---|---|---|
| Active share | Above 70 to 80 percent | Below 60 percent |
| Top 10 overlap with benchmark | Often less than 6 of 10 | Usually 8 to 10 of 10 |
| Sector allocation gap | Visible differences from benchmark | Mirrors benchmark sectors closely |
| Tracking error (3 to 5 years) | Above 4 percent | Below 2 percent |
| Expense ratio | Justifies active work | Same as active funds, but not earned |
Other signals to back up the headline numbers
The two main metrics tell most of the story, but a few extra checks help.
- Fund size: very large funds, especially those approaching the benchmark size, struggle to stay active by design.
- Manager tenure: a long tenure with a consistent style is positive. Frequent manager changes often coincide with style drift.
- Style box stability: a fund that calls itself focused but holds 70 stocks is a warning.
- Turnover ratio: extremely low turnover in a fund that markets itself as active can indicate hugging the benchmark.
Real example to make this concrete
Imagine a popular large-cap equity fund. It charges 1.7 percent in expenses for the regular plan. Its top 10 holdings overlap 9 out of 10 with the Nifty 50. Sector weights match the index within a percentage point. Active share works out to 35 percent. Three-year tracking error is 1.6 percent. The performance is index minus the expense ratio over five years.
That is a textbook closet index fund. The investor pays active fees and effectively buys an expensive Nifty 50 tracker. A direct-plan index fund or ETF with a 0.1 to 0.3 percent expense ratio would deliver the same exposure for far less.
What to do if your fund is a closet indexer
Discovering a closet indexer is not an emergency, but it does call for action.
- Switch to a low-cost index fund or ETF tracking the same benchmark, ideally in the direct plan.
- If you genuinely want active exposure, replace it with a fund that has high active share and strong long-term outperformance after fees.
- Be aware of capital gains tax on the switch. For equity funds in India, gains above 1.25 lakh a year are taxed at 12.5 percent.
- Use the cleanup as a chance to review your full portfolio. Most investors discover two or three quiet closet indexers when they start looking.
The bottom line
Knowing what is passive investing is half the battle. The other half is making sure your so-called active funds are actually active. Run the two-step check once a year. A small spreadsheet protects you from one of the most expensive silent costs in personal finance.
Frequently Asked Questions
- What is closet indexing?
- Closet indexing is when an actively managed fund holds a portfolio very similar to its benchmark while charging full active fees. The investor pays for active management but receives index-like performance.
- What is a good active share for a true active fund?
- An active share above 70 to 80 percent is considered genuinely active. Below 60 percent suggests the fund is closely tracking its benchmark and may be closet indexing.
- How is tracking error different from active share?
- Active share measures how different the holdings are from the benchmark. Tracking error measures how much the returns differ from the benchmark over time. Together, they give a complete picture of how active a fund truly is.
- Are all large funds closet indexers?
- Not all, but the larger a fund grows relative to its benchmark, the harder it is to stay genuinely active. Manager skill and conviction can still help, but the structural pressure to hug the index is real.
- What should I do if I find a closet index fund in my portfolio?
- Consider switching to a low-cost index fund or ETF tracking the same benchmark, or replace it with a genuinely active fund that has high active share and strong after-fee performance. Be aware of capital gains tax when switching.