A Systematic Investment Plan (SIP) is widely regarded as one of the most effective ways to build long-term wealth through mutual funds. Regular investing, disciplined contributions, and the power of compounding can help investors achieve financial goals over time. However, simply investing in multiple mutual funds does not automatically create a well-diversified portfolio.
Financial experts say one of the most common mistakes SIP investors make is fund overlap—a situation where multiple mutual funds hold many of the same underlying stocks. While the portfolio may appear diversified on paper, excessive overlap can increase concentration risk and reduce the benefits of investing across different funds.
What Is Fund Overlap?
Fund overlap occurs when two or more mutual fund schemes invest in a significant number of the same companies. Even though an investor owns multiple mutual funds, a large portion of the investment may ultimately be exposed to identical stocks.
This can create the illusion of diversification while actually concentrating investments in a limited set of companies.
For long-term investors, avoiding excessive overlap is an important part of building a balanced portfolio.
A Portfolio Review Reveals the Issue
Consider the example of a 42-year-old investor who contributes ₹50,000 every month through SIPs and increases the investment by 10% annually using the step-up SIP feature.
The investor had allocated money across seven mutual fund schemes, including:
- Nippon India Mutual Fund
- Parag Parikh Mutual Fund
- ICICI Prudential Equity & Debt Fund
- HDFC Mid-Cap Fund
- Invesco India Mid Cap Fund
- Bandhan Small Cap Fund
- Invesco Small Cap Fund
At first glance, the portfolio appeared to be well diversified because it included funds from different categories and asset classes.
However, a detailed portfolio analysis revealed that the Invesco India Mid Cap Fund and the Invesco Small Cap Fund had an estimated 49% portfolio overlap.
This meant that nearly half of the investments in those two funds were exposed to many of the same underlying companies.
Why Fund Overlap Can Be Risky
A high level of overlap reduces the primary advantage of owning multiple mutual funds—diversification.
Some of the potential drawbacks include:
- Higher concentration in the same stocks.
- Reduced portfolio diversification.
- Increased exposure to sector-specific risks.
- Similar performance across multiple funds.
- Greater downside if the common holdings perform poorly.
If the overlapping companies face market pressure or underperform, several mutual funds in the portfolio may decline simultaneously, increasing overall investment risk.
Diversification Should Be Meaningful
Financial planners generally recommend selecting mutual funds that complement one another rather than investing in several schemes with similar portfolios.
For example, investors may consider combining funds from different categories such as:
- Large-cap funds
- Flexi-cap funds
- Mid-cap funds
- Small-cap funds
- Hybrid funds
- International funds (where suitable)
However, simply choosing different fund categories does not guarantee diversification. Reviewing the actual portfolio holdings remains equally important.
How Investors Can Check Fund Overlap
Before investing in a new mutual fund, investors can:
- Compare the top stock holdings of different funds.
- Review monthly portfolio disclosures published by asset management companies.
- Use mutual fund research platforms that provide fund overlap analysis.
- Periodically review their SIP portfolio with a qualified financial adviser.
Regular portfolio reviews can help identify unnecessary duplication and improve overall asset allocation.
Review Your SIP Portfolio Regularly
Starting an SIP is only the first step toward long-term investing. Experts recommend reviewing your portfolio at least once or twice a year to ensure your investments continue to align with your financial goals, risk tolerance, and market conditions.
If multiple funds are delivering similar exposure, consolidating the portfolio may improve diversification without increasing the number of investments.
The Bottom Line
SIPs remain one of the most effective tools for long-term wealth creation, but building a successful portfolio requires more than investing in several mutual funds. Excessive fund overlap can reduce diversification and expose investors to unnecessary concentration risk.
Before adding another mutual fund to your SIP portfolio, review its underlying holdings and compare them with your existing investments. A thoughtfully diversified portfolio can help balance risk while improving the potential for consistent long-term returns. Investors should consider consulting a qualified financial adviser before making changes to their investment strategy.
