Portfolio Overlap Explained
What is it?
Portfolio overlap measures how much two or more of your mutual funds hold the same underlying stocks. High overlap means you're effectively paying for multiple funds while getting exposure to largely the same companies.
Why should you care?
It's easy to believe you're diversified because you own several funds, when in reality those funds may hold 60-70% of the same stocks. Checking overlap reveals whether your funds are truly complementary or just duplicates with different names.
Real-life example
An investor holds two large-cap funds from different AMCs, believing this spreads risk. A stock-level overlap check shows the two funds share about 70% of their holdings by weight — meaning most of the money is really riding on the same set of companies, not two genuinely different strategies.
Common mistakes
- Assuming funds from different AMCs (fund houses) automatically hold different stocks.
- Adding a new fund in the same category as an existing one without checking overlap first.
- Ignoring overlap because 'both funds are top-rated' — high ratings don't mean low overlap.
Illustrative overlap between two large-cap funds
| Fund pair | Approx. holdings overlap |
|---|---|
| Two large-cap funds, different AMCs | ~60-75% |
| Large-cap fund + flexi-cap fund | ~30-45% |
| Large-cap fund + sector fund | ~5-15% |
FAQ
How can I check overlap between my funds?
This is category-level and stock-level data published by fund houses and analytics platforms — FundSageAI's portfolio analytics can show this once you've mapped your portfolio.
Is some overlap always bad?
Not necessarily — a little overlap is normal since popular large companies appear in many funds. The concern is when overlap is so high that two funds behave almost identically.
Does overlap only happen within the same category?
It's most common within the same category (e.g., two large-cap funds), but can also happen across categories if both hold similar large, popular stocks.
What should I do if I find high overlap?
Consider whether you need both funds, or whether replacing one with a fund from a different category would improve actual diversification.
See this concept applied to your own portfolio
Get Started - It's FreeFundSageAI is an analytics platform. Academy lessons are for educational purposes only and do not constitute financial advice. Always consult a SEBI-registered investment advisor for personalised recommendations.