Investing basics
Diversification reduces concentration; it does not remove risk
Diversification means spreading exposure across holdings whose risks are not identical. The relevant question is not simply how many line items an account contains, but whether the underlying businesses, sectors, regions, currencies and risk factors behave differently.
Explainer Reviewed 08-21-2026
What it is for
A diversification check can reveal when several funds own many of the same securities or when one position drives most of a portfolio’s movement. Looking through to underlying holdings is more informative than counting account rows.
What it cannot tell you
Diversification cannot guarantee a gain or prevent loss. Correlations can rise during stress, broad markets can fall together and a diversified portfolio can still carry inflation, rate, currency or liquidity risk. This guide does not prescribe an allocation.
How to verify the object
List each holding and its weight, then inspect fund holdings and sector or geographic concentration using current sponsor documents. Note duplicated exposures. Recheck after material portfolio or index changes.