Portfolio diversification: a practical checklist

Owning many things is not the same as being diversified. Here is what to actually check.

Vitta-Kosh team · Updated 25 September 2026 · 7 min read

Diversification means that no single company, sector, fund manager or currency can badly damage your overall wealth. The hard part is that most investors hold money across several brokers and fund houses, so the full picture is hidden. Twenty holdings spread across three apps can still be a concentrated bet.

This is educational content, not a recommendation. Suitable allocation depends on your goals, time horizon and risk tolerance. Consider speaking to a SEBI-registered investment adviser.

1. Single-stock concentration

Add up each company across every account, including the shares hidden inside your mutual funds if you can. A common rule of thumb is that no single stock should be more than about 10% of your equity portfolio, unless you have a strong reason and accept the risk.

Watch for: employer stock (your salary and savings both depend on one company), and the same large-cap stock bought in two different demat accounts.

2. Sector exposure

Indian portfolios often lean heavily on banks and financial services, because they are the largest weight in NIFTY 50. Add IT and energy, and three sectors can easily be over 60% of your equity. Group your holdings by sector and ask: if this one sector fell 30%, how much would my net worth fall?

3. Mutual fund overlap

Five large-cap or flexi-cap funds often hold the same top 20 stocks. You pay five expense ratios and get roughly one index. Before adding a new fund, compare its top holdings with the funds you already own. Fewer, clearly different funds are usually better than many similar ones.

4. Asset mix

Diversification across asset classes matters more than within one. Look at the split between:

• Equity (Indian and international)
• Debt: fixed deposits, bonds, debt funds, EPF, PPF
• Retirement: NPS
• Gold and other assets

A fixed rule such as "100 minus age in equity" is too crude for most people, but writing down a target mix and checking it once a year is a good habit. When one asset has grown far above target, rebalancing brings risk back to where you intended.

5. Currency and geography

All-India portfolios depend on one economy and one currency. A modest allocation to US or global equity has historically reduced overall volatility for Indian investors, and the rupee's long-run depreciation against the dollar has added to rupee returns. Note the tax treatment is different; see our capital gains guide.

6. Platform and counterparty risk

Your demat holdings are held with NSDL or CDSL, not by your broker, so a broker failure does not wipe out your shares. Still, spreading across two brokers makes it easier to keep trading if one app has an outage, and keeping your CAS statements gives you an independent record.

Over-diversification is a problem too

The opposite mistake is common as well. Forty stocks and twelve mutual funds become impossible to follow, and the result often behaves like an expensive index fund. Signs you may have gone too far:

• Many positions are under 1% of your portfolio, too small to matter even if they double.
• You cannot say why you own a holding, or when you would sell it.
• Your returns closely track NIFTY 50, but you pay active fund fees and spend hours on research.

If that sounds familiar, a low-cost index fund for the core, with a small number of high-conviction holdings around it, is often simpler and cheaper.

A 15-minute annual review

1. Pull everything into one view: all brokers, funds, bonds and NPS.
2. Check the top five holdings as a percentage of net worth.
3. Check sector weights across all equity.
4. Compare your asset mix with your written target.
5. List changes, and consider the tax cost before selling anything.