Investing · General financial education

Themes and concentration

Many names in a fund do not automatically mean diversification. If they share the same supply chain, they can move together.

In more detail

Theme, sector or country funds bundle a shared risk behind a label. Eighty names in a climate theme can share the same commodities, customers and rules. The word ETF or index does not change that shared dependence.

Background

You measure concentration by shared drivers, not by the headcount. Several funds with the same heavyweights are not extra diversification. In stress, thematic baskets can move more alike. Finmon does not rate a theme as “the future”.

An example

A theme fund lists 80 companies. Three quarters hang on the same chip-and-battery supply chain. The name list looks long. The economic risk is narrower than the count.

A common misconception

Many names = broadly diversified.

Diversification depends on shared drivers, not on the length of the list.

Source: Investor.gov · Asset allocation. Last reviewed: 2026-11-09. Editorially reviewed on 2026-11-09. Next review 2027-11-09. Version 0.2.0. Finmon explains. It does not advise. Not investment, tax or legal advice.