Diversification: What It Does and Does Not Do

Owning several funds does not guarantee diversification. Different funds may hold many of the same securities or respond to the same economic risks.

Review underlying holdings, geographic exposure, sectors, credit quality, and duration where relevant.

Diversification can occur within an asset class and across asset classes. A broad stock fund diversifies company-specific risk, while adding bonds may diversify the source of portfolio risk.

In broad market stress, many assets can fall together. Diversification manages risk; it does not guarantee profit or eliminate loss.

Two funds can own many of the same companies. A broad-market fund and a technology fund may create more technology concentration, not an independent return source. Look through to issuers, sectors, countries, currencies, credit quality, and duration.

Diversification works best on risks that are genuinely distinct. Owning more securities can reduce company-specific risk, while mixing asset classes can address broader sources of risk. Neither guarantees a positive result.

Employer stock, deferred compensation, a pension, real estate, and future income can create exposures that a fund list misses. If income and investments depend on the same company or industry, a single event can damage both.

A concentrated position may be intentional. Document why it exists, its maximum acceptable size, tax constraints, and a method for reducing it instead of allowing drift to make the decision.