Most Indian investors think of their "portfolio" as their direct stock holdings — the demat account. But if you also hold equity mutual funds, large-cap ETFs, or NPS equity funds, those funds own stocks too. Many of those stocks overlap with your direct holdings. The result is that your actual exposure to top Indian companies — HDFC Bank, Reliance, Infosys, TCS — may be significantly higher than your direct stock allocation suggests, because the same names appear repeatedly across your mutual fund holdings.
How Overlap Creates Hidden Concentration
Consider a common Indian retail portfolio: ₹15 lakh in direct stocks (including HDFC Bank at 8%, Reliance at 7%, Infosys at 6%) and ₹10 lakh in three mutual funds — a large-cap fund, a flexi-cap fund, and an ELSS fund. Each of these funds likely holds HDFC Bank as their top or second-largest holding (typically 8–12% of the fund). So your total HDFC Bank exposure across the combined ₹25 lakh portfolio might look like this:
- Direct stocks: 8% × ₹15 lakh = ₹1.2 lakh
- Large-cap fund (40% of MF corpus, 10% HDFC Bank): 10% × ₹4 lakh = ₹40,000
- Flexi-cap fund (35% of MF corpus, 9% HDFC Bank): 9% × ₹3.5 lakh = ₹31,500
- ELSS fund (25% of MF corpus, 8% HDFC Bank): 8% × ₹2.5 lakh = ₹20,000
- Total HDFC Bank: ₹1,71,500 — 6.9% of total ₹25 lakh portfolio
But your perceived direct exposure was 8% of ₹15 lakh = ₹1.2 lakh (4.8% of total). The overlap adds another 2.1 percentage points of effective HDFC Bank exposure — 40% more than you thought. Across multiple large-cap names, this effect compounds significantly.
Why This Matters: SEBI's 10-Stock Overlap Insight
The top 10 stocks in NIFTY 50 (HDFC Bank, Reliance, Infosys, ICICI Bank, TCS, Bharti Airtel, Kotak Bank, Axis Bank, L&T, HUL) represent roughly 55–60% of the NIFTY 50 index weight. Every large-cap or index fund tracks these names heavily. If you hold direct stock positions in any of these 10 AND hold large-cap mutual funds, you almost certainly have concentrated overlap — often without realising it. When HDFC Bank or Reliance corrects sharply, the hit affects your direct portfolio AND your mutual fund NAVs simultaneously.
This is not a reason to avoid large-caps or mutual funds. It is a reason to measure the overlap before assuming your combined portfolio is more diversified than it actually is. LaHaie analyses your uploaded portfolio holdings to compute Effective Holdings and Concentration Risk across your combined exposure. Read our guide on portfolio size for how Effective Holdings relates to true diversification, and our concentration risk analysis for how to interpret your concentration score.
How to Check and Fix Portfolio Overlap
Step 1 — Get MF portfolio data: Download your mutual fund holdings from CAMS or KFintech (both provide consolidated holdings statements with individual stock-level data). This shows you the top 10 holdings of each fund you own.
Step 2 — Combine with direct stocks: Add up your direct stock allocation plus the weighted MF exposure to each company. Any single company above 8% of combined portfolio value is a concentration flag.
Step 3 — Fix through fund selection: If your direct portfolio is already heavily large-cap, consider replacing one large-cap mutual fund with a mid-cap or small-cap fund to reduce overlap. The fund categories with the lowest large-cap overlap are: small-cap funds, sector/thematic funds (non-banking), and international funds.
🔍 BBS Insight
The most common portfolio overlap pattern in Indian retail investors: direct holdings in HDFC Bank, Reliance, Infosys, and ICICI Bank — all at 6–10% weight — combined with 3 large-cap mutual funds that each hold these same names as their top positions. The investor believes they are "diversified" across stocks and mutual funds, but the combined portfolio behaves like a highly concentrated large-cap bet on 4–6 names. The solution is not to abandon mutual funds — it is to use fund categories that genuinely diversify: mid-cap funds, small-cap funds, international equity funds, or sector-specific funds that do not replicate the direct large-cap holdings. Check your overlap before your next SIP investment, not after your next correction.