How Many Stocks Should You Hold in Your Portfolio? — The India Investor's Answer

The most common portfolio construction question from Indian retail investors: "How many stocks should I hold?" The most common answers — 10, 20, 30, as many as possible — are all oversimplifications. The right answer depends on what diversification is actually trying to achieve, and why the raw stock count is almost irrelevant to achieving it.

What Diversification Actually Does

Diversification reduces idiosyncratic (stock-specific) risk — the risk that one company's bad news wipes out a large portion of your portfolio. The key insight from portfolio theory is that diversification benefits are front-loaded: the jump from 1 stock to 5 stocks eliminates roughly 60% of idiosyncratic risk. From 5 to 10 stocks, another 20%. From 10 to 20, another 10%. Beyond 20–25 well-chosen stocks, each additional stock adds diminishing marginal diversification benefit while adding monitoring complexity.

This means that a 40-stock portfolio and a 25-stock portfolio provide nearly identical diversification benefits — assuming the positions are genuinely independent. The critical qualifier is "genuinely independent." A 40-stock portfolio with 18 stocks in the same sector provides less actual diversification than a 15-stock portfolio spread across 8 sectors.

The Effective Holdings Number — What Actually Matters

Effective Holdings (derived from the Herfindahl-Hirschman Index) measures how many truly independent bets your portfolio actually represents, accounting for position weighting. A portfolio with 40 stocks but 45% concentrated in 4 names has an Effective Holdings of approximately 8–10 — it behaves like 8–10 independent positions, not 40.

This is the number that matters for diversification — not the raw stock count. LaHaie calculates your portfolio's Effective Holdings as part of its Portfolio Intelligence Report. Most investors who discover their Effective Holdings number for the first time are surprised to find it significantly lower than their raw stock count — often by a factor of 3–5x. A portfolio they thought was diversified across 35 stocks actually behaves like 9–12 independent bets.

The Practical Range: 15–25 for Most Indian Retail Investors

For a retail investor managing their own portfolio without a research team, 15–25 stocks in 8–12 sectors is the optimal range in practice. Here is why:

• Below 15: Even a single bad outcome (fraud, regulatory action, sector collapse) can cause a 10–15% portfolio impact. Concentration risk is structurally high.
• 15–25: Meaningful diversification across sectors with position sizes large enough (4–7% each) to meaningfully impact portfolio returns when correct. Manageable to track quarterly.
• 25–40: Still manageable but diminishing returns. Many positions will mirror the index — you are effectively building an expensive index fund with active stock-picking costs.
• Above 40: Difficult to track meaningfully. Risk of owning businesses you no longer understand. Effective Holdings rarely improves proportionally because the additional stocks tend to be smaller positions with lower weight impact.

The Mutual Fund Overlap Problem

Many Indian investors hold both direct stocks and mutual funds — and count only their direct stocks as their "portfolio." But a NIFTY large-cap mutual fund may already own all the large-caps in your direct portfolio. If you hold HDFC Bank directly at 6% of your total investable wealth AND HDFC Bank is 8% of a mutual fund that represents 25% of your wealth, your effective HDFC Bank exposure is roughly 6% + (8% × 25%) = 8% — higher than you intended. Read our portfolio overlap guide for how to account for this. Use our BBS Stock Scorecard to evaluate the quality of your individual stock positions.