Spreading SIPs Across Multiple Mutual Funds: A Risk of Diversification Overkill

The Dangers of Over-Diversification in Mutual Fund Investing

Many investors start their mutual fund journey with a sensible plan, but over time, their portfolios can become cluttered and confusing. They may begin with a single Systematic Investment Plan (SIP), then add another for tax saving, and another for small-cap or mid-cap investments, often without fully understanding the underlying strategy.

As a result, many investors end up with eight, ten, or even fifteen mutual funds, without realizing that many of these funds hold the same stocks. This is where over-diversification becomes a real issue. For someone investing around Rs 25,000 monthly through SIPs, the goal should not be to accumulate the highest possible amount, but to build a portfolio that is sufficiently diversified to reduce risk while remaining focused and manageable.

Why Over-Diversification Happens

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One major reason for over-diversification is psychological. Every new mutual fund category sounds attractive when markets are performing well, and investors often fear "missing out." Instead of increasing SIP amounts in existing good-quality funds, they keep opening new SIPs in additional schemes. This leads to a cluttered portfolio, where different mutual funds frequently hold overlapping portfolios.

As shown in the table, different mutual funds frequently hold overlapping portfolios, which means the diversification may not be as broad as it appears on paper.

How Many Mutual Funds Are Usually Enough

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There is no perfect universal number, but for most ordinary long-term investors, a relatively compact portfolio is often enough. For a Rs 25,000 monthly SIP, many financial planners believe that somewhere around three to five carefully selected funds are usually sufficient for proper diversification across market segments. A diversified flexi-cap or large-and-mid-cap fund for core stability, a mid-cap or small-cap allocation for growth, and possibly an international or index component, depending on risk appetite and goals, can already create meaningful diversification without becoming difficult to track.

The Problem with Excessive Diversification

One interesting problem with excessive diversification is that it can dilute strong-performing investments. If an investor spreads Rs 25,000 across 10 or 12 funds, the individual allocations become very small. Even when one scheme performs exceptionally well, its contribution to the total portfolio may remain limited because the money is spread too thin elsewhere. Reviewing performance becomes much harder, and many investors eventually stop tracking whether individual funds still fit their goals because the portfolio itself becomes too complicated to manage properly.

Diversification vs. Over-Diversification

Diversification is important because it reduces dependence on a single sector, stock category, or investment style. But over-diversification happens when additional investments no longer meaningfully improve risk management and simply create overlap. It is like having multiple umbrellas in the rain. At some point, extra umbrellas no longer provide real protection.

The Right Portfolio Depends on Simplicity

One thing experienced investors often learn with time is that simplicity itself has value. A clean portfolio is easier to understand, rebalance, and continue during difficult market phases. Investors are also less likely to panic or make impulsive changes when they clearly understand why each fund exists in the portfolio. This becomes especially important during market corrections.