What is Concentration Risk?
Concentration Risk is the risk that too large a portion of a fund's portfolio is tied to a single stock, sector, theme, or business group. When that concentrated position goes wrong — a profit warning, a regulatory action, a management scandal — the entire fund suffers a large, disproportionate loss.
In small cap investing, concentration risk is especially dangerous because small cap stocks are less liquid and the news can move them 15–25% in a single session. A 7% position in a single stock that falls 25% immediately drags the fund NAV down by 1.75% in one day — a significant hit.
Forms of Concentration Risk
Stock Concentration: A single stock making up 7–10% of the portfolio. In a large cap fund this is aggressive; in a small cap fund it is very high risk.
Sector Concentration: Heavy exposure to one sector — say 35% in manufacturing or 28% in financial services. When the sector faces regulatory headwinds or a cyclical downturn, a large portion of the portfolio is impacted simultaneously.
Theme Concentration: Multiple stocks in the same thematic story — say six different EV component manufacturers, or four defence equipment companies. Even though they are different stocks, they share the same underlying risk factor.
Promoter Group Concentration: Hidden concentration where the fund holds multiple listed companies from the same business group. If the promoter group faces issues, all holdings may be impacted.
The Manufacturing Theme Concentration Risk (2024–25)
By late 2024, several small cap funds had accumulated 28–35% of their portfolios in capital goods, manufacturing, and defence-related stocks — driven by the government's PLI (Production Linked Incentive) and infrastructure spending theme. When growth in government capex spending showed signs of slowing in late 2024, these funds saw disproportionate corrections of 20–28% vs the broader small cap index decline of 18–20%. Investors who checked sector concentration would have spotted this risk in advance.
| Fund | Top 10 Holdings % | Largest Sector % | Concentration Assessment |
|---|---|---|---|
| Nippon India Small Cap | ~32% | ~18% | Well diversified |
| SBI Small Cap | ~38% | ~22% | Moderate, controlled |
| Motilal Oswal Small Cap | ~58% | ~32% | High concentration |
How to Check Concentration Risk
Every AMC publishes a monthly factsheet with the fund's top 10 holdings and sector allocation. Check: Is any single stock above 5%? Is the top 10 above 50%? Is any one sector above 25%? SEBI mandates a minimum of 65% in small cap stocks, but within that the fund manager has discretion — and that discretion is where concentration risk lives.