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Market · Higher risk

Stocks

Ownership shares in public companies — the core growth engine of most portfolios.

By ROIStreet EditorialReviewed by ROIStreet PublisherLast reviewed: 2026-09-06Editorial process

What stock ownership actually gives you

A stock represents an ownership interest in a business. That makes the long-term economics different from simply betting on whether a ticker moves up or down. Revenue growth, margins, reinvestment, competition, debt and the price paid for those earnings all affect what shareholders ultimately earn.

Individual stocks also create company-specific risk. A business can lose customers, overpay for an acquisition, take on too much debt or simply disappoint investors even when the broader market performs well. Diversification reduces the damage one company can do to a portfolio, but it does not eliminate market-wide losses.

What to compare

The important comparison is not simply one stock versus another. Decide whether the exposure should come from individual companies or a diversified fund, how large any single-company position should become, and whether the portfolio already owns the same companies indirectly through ETFs or index funds.

Common mistakes

  • ×Concentrating in employer stock alongside employer income
  • ×Trading on headlines rather than a documented thesis
  • ×Judging a company by share price rather than the earnings behind it
  • ×Selling a broad position during a drawdown with no plan to re-enter