Concentration Risk
What is it?
Concentration risk is the danger of having too much of your portfolio exposed to a single stock, sector, or theme — so that a shock to that one thing significantly damages your entire portfolio, even if you technically own multiple funds.
Why should you care?
A portfolio can look diversified by fund count while actually being concentrated, if those funds all lean heavily on the same sector or a handful of large stocks (see Portfolio Overlap Explained). Concentration risk hides inside portfolios that seem diversified on the surface.
Real-life example
An investor holds a banking sector fund alongside two large-cap funds that are themselves heavily weighted toward large private banks. When the banking sector faces a regulatory setback, all three funds fall together — the investor's portfolio was more concentrated in banking than it appeared.
Common mistakes
- Adding a sector or thematic fund on top of diversified funds without checking how much sector exposure already exists.
- Judging diversification purely by fund count instead of by underlying stock and sector exposure.
- Chasing a recently outperforming sector, unintentionally concentrating the portfolio right before a reversal.
Common sources of concentration risk
| Type | Example |
|---|---|
| Single stock | One company appears heavily across multiple funds you own |
| Single sector | Sector fund plus sector-heavy diversified funds |
| Single theme | Multiple thematic funds around the same trend |
FAQ
Are sector or thematic funds always risky?
Not inherently, but they carry higher concentration risk than diversified funds and work best as a small satellite allocation (see Core & Satellite Portfolio Strategy), not the core of a portfolio.
How much sector exposure is too much?
There's no fixed number, but if a single sector makes up a large share of your total equity portfolio's underlying holdings, it's worth reviewing.
Is concentration risk the same as portfolio overlap?
They're related — overlap is one way concentration risk builds up unintentionally, but concentration can also come from deliberately heavy bets on one sector or theme.
Does concentration risk apply to debt funds too?
Yes — a debt fund concentrated in a few issuers carries credit concentration risk, similar in principle to equity sector concentration.
See this concept applied to your own portfolio
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