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Buying an individual stock means taking on the risks of the whole market and the risks of one specific company. Its price can fall even if the company remains in business; if the company is liquidated, common shareholders may receive nothing. A large position in one stock can also make a portfolio unusually dependent on that company’s fortunes. Diversification can reduce some of that exposure, but it cannot prevent losses or guarantee a gain.
What can go wrong when you own a stock?
The price can fall without the company failing
A stock price can move because of company news, such as a product problem, or broader economic, political, and market events. Ordinary volatility is different from business failure: a company does not have to be close to bankruptcy for its share price to decline. Investor.gov explains that both company-specific events and external forces can affect stock prices in its guide to what risk means.
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You can lose money, including all of it
If you sell for less than you paid, you realize a loss. A share price may also fall substantially and may not recover. In liquidation, common shareholders are behind creditors and preferred shareholders in the payment order; there may be nothing left for common stockholders. See Investor.gov’s stock FAQs.
Your outcome may depend too heavily on one issuer
When a large share of your investments is in one company, a company-specific setback can have an outsized effect on your portfolio. This is concentration risk. It can be especially consequential when the stock is also your employer’s stock: your investment and your income may both be exposed to the same business. The SEC cautions investors against putting too much into one individual stock, including employer stock, in its Ten Things You Should Know About Investing.
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How the main risks differ
- Business and issuer risk: Products, operations, finances, management, or a company’s competitive position can weaken. A company’s public disclosures can help you assess it, but they do not guarantee success.
- Market risk: Broad market, economic, political, or other external events can push prices down even when the company has no new, company-specific failure.
- Volatility and timing risk: Prices fluctuate. Selling during a downturn can turn a paper decline into a realized loss, and a short holding period may leave little time for a recovery. Recovery is never assured.
- Concentration risk: A portfolio dominated by one issuer is more exposed to that issuer’s outcome than a portfolio spread among different investments.
- Failure and liquidation risk: If the company is liquidated, common shareholders are paid only after creditors and preferred shareholders, and may receive nothing.
- Information and promotion risk: A company with limited public information can be harder to evaluate. Viral stock tips, sudden surges, and promises of high returns with little or no risk deserve careful scrutiny.
Why your time horizon matters
Stocks can be very risky over short periods because prices can fluctuate substantially. If you will need the money soon, a decline may force you to sell at an unfavorable time rather than wait to see whether the price recovers. Investor.gov’s guide to asset allocation, diversification, and rebalancing discusses how time horizon and tolerance for risk relate to investment choices. The right approach depends on your circumstances; no holding period guarantees a positive result.
Individual stock or diversified fund?
| Consideration | Individual stock | Diversified fund |
|---|---|---|
| Issuer exposure | Primarily one company | Many holdings, or a broader asset mix depending on the fund |
| Company-specific risk | Concentrated in that issuer | Spread across holdings, but not eliminated |
| Price declines | Can fall | Can also fall; diversification does not remove market risk |
| What to assess | The company, its disclosures, and how much of your portfolio depends on it | Holdings, diversification, fees, and the fund’s design |
A diversified fund can spread exposure to any one company, but it is not automatically safer or right for every investor. Its holdings and costs matter, and a fund that owns stocks remains exposed to stock-market declines.
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Risks beyond simply holding shares
Buying and holding a stock is not the same as short-term trading, short selling, or using leveraged products. Short selling can expose an investor to theoretically unlimited losses if the stock keeps rising. Leveraged and inverse single-stock exchange-traded funds add leverage or daily-reset exposure, so they are not equivalent to simply owning the stock. These strategies have distinct risks beyond the possibility that an ordinary share price falls.
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- Match the investment to your time horizon. Ask whether you can leave the money invested through a substantial decline and whether you can tolerate the possibility that it will not recover.
- Check your concentration. Consider what portion of your investments would depend on this one company, including any employer stock you already own. Look at whether other holdings are meaningfully diversified.
- Read the company’s filings. Use the SEC’s EDGAR database to review public-company disclosures, and make sure you understand the business, finances, and material risks. Disclosure is information, not a promise of future performance.
- Verify the source of a tip. Be cautious about buying because of a viral post, a sudden price surge, or claims that an investment offers high returns with little or no risk. The SEC’s hot-stock and social-media alert warns about short-term investing in volatile stocks promoted through social media. A stop order cannot guarantee a particular sale price.
- Check any professional you use. Review an investment professional’s registration, background, and disciplinary history through SEC Investment Adviser Public Disclosure and FINRA BrokerCheck. Understand fees and conflicts of interest before proceeding.
What diversification can—and cannot—do
Holding different investments can reduce the effect of one company’s problems on a portfolio, but it cannot eliminate investment risk or guarantee a positive return. In its October 5, 2026 bulletin, the SEC-led World Investor Week put the point this way: “In a well-diversified investment portfolio, if one particular investment suffers a loss, other investments might help balance out the loss.” The bulletin’s wording is deliberately limited: other investments might offset some losses, not erase them.
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