Term · Portfolio & Execution
Concentration Risk
In briefConcentration risk refers to a portfolio's excessive dependence on a few individual positions, sectors or regions. When too much capital is concentrated in one point, its failure hits the overall result disproportionately hard and noticeably raises the risk of loss.
Definition
Concentration risk arises when a large part of a portfolio or a business depends on a few individual positions, securities, sectors or regions. If one of these concentrated positions fails, it has a disproportionate effect on the overall result. Diversification aims to reduce such concentrations.
How it is calculated
Formula. Concentration share = largest single position ÷ portfolio value × 100 %
Why it matters for small caps
In nano and micro caps, limited liquidity easily leads to individual stocks acquiring a heavy weight in the portfolio. A concentrated position cannot readily be sold in the event of a price slump.
Common misreadings
- Concentration risk is often related only to individual stocks, even though sector, theme or factor concentrations can also form a cluster.
In the process
Frequently asked
When does one speak of a concentrated position?
There is no fixed threshold; it is common to regard individual positions from around ten percent of the portfolio as worth watching. The specific threshold depends on the risk profile and investment strategy.
Does concentration risk affect only individual stocks?
No. Several stocks from the same sector, the same region or with the same risk factor can together form a concentration, even if each individual position looks small.
Why is this especially relevant for micro caps?
Low trading liquidity makes it harder to reduce a heavy single weight without a larger price move. In stress, such a concentration often cannot be unwound quickly there.
Related terms
Education only, not investment advice. Ranges and thresholds are didactic orientation values, not an official standard.