What is Mutual Fund Overlap?

Mutual fund overlap is the percentage of shared stock exposure between two funds. If both hold HDFC Bank, Reliance, and Infosys, those common holdings drive the overlap score. High overlap means paying two expense ratios for largely the same portfolio, without the real diversification benefit of holding two.

Some overlap is normal, particularly across large-cap funds that draw from the same restricted universe. The concern begins when overlap crosses 30 to 40%, at which point two funds start behaving as one and the diversification you paid for begins to disappear.

How is Overlap Calculated?

This calculator uses the minimum-weight method:

For each common stock, we take the lower of the two weights and sum them. If HDFC Bank is 8% in Fund A and 5% in Fund B, only 5% is counted toward overlap.

How to Calculate Mutual Fund Overlap Step by Step

Using the Finnovate MF Overlap Calculator takes under a minute:

1. Type the first fund name in the Scheme 1 search box and select it from the dropdown. Both direct and regular plans are listed.
2. Type the second fund name in the Scheme 2 search box and select it the same way.
3. Click Check Overlap. The calculator instantly computes the overlap percentage using live AMFI holdings data.
4. Read the result and zone label. The overlap score is shown alongside a zone: Low (under 15%), Moderate (15–30%), High (30–50%), or Very High (50%+).
5. Switch to the Common tab to see every stock held by both funds, with its exact weight in each scheme side by side.
6. Open Fund Comparison to review AUM, expense ratio, category, and trailing returns for both funds in one view.

Illustrative Example: HDFC Flexi Cap vs Parag Parikh Flexi Cap

Parag Parikh Flexi Cap's international allocation (Alphabet, Meta) and concentrated domestic book keep its overlap with HDFC Flexi Cap well below what two mainstream large-cap funds would show.

Result: Moderate overlap. Holdings are illustrative based on publicly available AMFI quarterly disclosures. Actual figures change each quarter. Use the calculator above for live results.

What Overlap Percentage is Acceptable?

There is no universal rule, but these ranges serve as a practical guide for Indian equity funds:

What Causes Mutual Fund Overlap?

Effects of High Mutual Fund Overlap on Your Portfolio

High overlap has three practical costs:

How to Reduce Mutual Fund Overlap

High overlap is a signal to review, not necessarily act. Start here:

• Diversify across SEBI categories. A large-cap and a mid-cap cover different market segments by mandate. Two large-caps, even from different AMCs, will always share structural overlap.
• Diversify across AMCs. Different AMCs have independent research teams and sector views. Multiple funds within one AMC often reflect the same house-level conviction calls.
• Check before adding, not after. Run this calculator against your existing holdings before committing to a new fund.
• Review annually. Fund portfolios shift each quarter. An overlap check from six months ago may not reflect current holdings.

Please consult a SEBI-registered investment adviser before making portfolio changes based on overlap data alone.

How to Build a Low-Overlap Mutual Fund Portfolio

A few principles help structure a portfolio where funds genuinely complement each other rather than duplicate exposure:

1. Limit your total to 4 to 6 funds. More funds create complexity without adding real diversification. Beyond six, incremental benefit shrinks rapidly while tracking and rebalancing overhead grows.
2. Diversify by market cap and style. Combine funds across distinct SEBI categories: a large-cap or index fund for core stability, a mid-cap or small-cap for growth, and a value or contra fund for style diversity. Each category draws from a different stock universe by regulation.
3. Mix active and passive strategies. Actively managed funds often cluster around the same blue-chip names. Pairing an active fund with a broad index fund dilutes this concentration and lowers overall overlap without sacrificing market coverage.
4. Add an international fund for zero domestic overlap. Any fund investing in overseas equities carries no Indian stock overlap with domestic holdings by definition. Even a modest international allocation meaningfully reduces whole-portfolio overlap.
5. Check overlap before every addition. Holdings shift each quarter as managers rebalance. Use this calculator before adding any new fund and revisit at least annually. Above 30% with any existing holding is a clear signal to look elsewhere.

Overlap Check Before Every SIP Top-Up: A Checklist

Run through this before every SIP increase or new fund addition:

• Is the new fund in a different SEBI category from what I already hold?
• Is it from a different AMC with an independent research team?
• Does the calculator show below 30% overlap with each fund I hold?
• Are the top holdings of the new fund different from my existing funds?
• Has the fund manager changed recently?
• Am I adding this for a specific reason, not just chasing recent returns?