How investing works

Ownership: how stocks work

A stock, or equity share, represents partial ownership in a company. Companies issue stock to raise money for purposes such as repaying debt, launching new products, or expanding operations, and in exchange investors may receive capital appreciation, dividends, and, for common stock, voting rights, according to Investor.gov. Preferred stock generally does not carry voting rights but receives dividend payments ahead of common stock and has priority over common stock if the company is liquidated. Stocks are commonly grouped into categories such as growth, income, value, blue-chip, and by company size — large-cap, mid-cap, small-cap, and microcap — with penny stocks flagged as highly speculative.

Stock prices can rise or fall, and losses are possible; Investor.gov notes that large-company stocks have historically lost money in roughly one out of every three years even though they have strong long-term growth potential. If a company fails, common shareholders are paid only after bondholders and preferred shareholders, making them last in line for any remaining assets, as explained on Investor.gov's overview of investment risk. Investors typically buy and sell shares through a broker, a direct stock plan, a dividend-reinvestment plan, or a stock mutual fund, and public companies' financial filings are available for review through the SEC's EDGAR database.

Lending: how bonds work

A bond works differently: rather than buying ownership, the investor lends money to a government, municipality, or corporation, which promises to make periodic interest payments and repay the principal when the bond matures, per Investor.gov. Corporate bonds fund company operations and range from investment-grade to higher-risk high-yield bonds; municipal bonds finance public projects such as schools and highways and often carry favorable tax treatment; and U.S. Treasury securities — bills, notes, bonds, and inflation-protected TIPS — are backed by the federal government. Bondholders generally do not own equity in the issuer and do not receive dividends, but in bankruptcy they typically have priority over shareholders, as described by Investor.gov's corporate bond guide.

Bond risk comes mainly from the possibility that the issuer defaults, from interest-rate changes that affect a bond's value if sold before maturity, from inflation eroding purchasing power, and from illiquidity if the investor cannot sell when desired, according to Investor.gov. Longer-term bonds generally pay higher rates but can carry more risk than shorter-term ones. Individual investors can also buy U.S. savings bonds directly from the Treasury: electronic Series EE and Series I bonds are sold through TreasuryDirect, each limited to $10,000 in face value per person per calendar year, with a penalty of the last three months' interest if redeemed within the first five years.

Pooling money: mutual funds and diversification

Rather than buying individual stocks or bonds, many investors put money into a mutual fund, which is an SEC-registered investment company that pools money from many investors and, under the management of an SEC-registered investment adviser, invests it in a mix of stocks, bonds, and other assets, as described on Investor.gov. Investors buy and redeem fund shares at the fund's net asset value, and can earn money through dividends, capital-gains distributions, or an increase in that value. Mutual funds offer built-in diversification and professional management, but they are not insured or guaranteed by the government, and fees and expenses are deducted from the fund's returns even when they are not paid directly out of pocket.

Diversification — spreading money across different investments and asset categories such as stocks, bonds, and cash — is a core tool for managing risk, because it reduces the effect of any single investment performing poorly, according to Investor.gov's guide to asset allocation and diversification. The right mix, known as asset allocation, depends on an investor's time horizon and risk tolerance: a longer time horizon can support a larger allocation to more volatile assets like stocks, while a shorter one may call for more conservative holdings. Because market movements shift a portfolio away from its original mix over time, investors periodically rebalance by selling some holdings and buying others to restore the intended allocation; target-date funds do this automatically, growing more conservative as a target date approaches.

Growing money over time and retirement accounts

Money invested can grow not just from its own returns but from returns earning further returns, a process commonly called compounding. The SEC's Investor.gov Compound Interest Calculator lets investors estimate how an initial amount, combined with a chosen interest rate and compounding frequency, grows over a chosen number of years, illustrating why starting earlier and staying invested longer can matter as much as the amount contributed. Regular contributions and time in the market are two of the few factors an individual investor can control directly, alongside costs and diversification.

Much long-term investing in the United States happens through tax-advantaged retirement accounts. Employers may offer 401(k) plans, and certain nonprofit, government, or educational employers may offer 403(b) or 457(b) plans, which generally let employees direct pre-tax pay into investments such as mutual funds, with taxes generally due when the money is withdrawn. Individuals can also open an Individual Retirement Account (IRA) with a vendor of their choice; a traditional IRA generally allows tax-deductible contributions with withdrawals taxed later, while a Roth IRA uses after-tax contributions with tax-free qualified withdrawals. The SEC does not regulate or oversee these retirement plans directly, so investors should also consult the IRS for tax rules specific to their accounts.

Federal oversight of the markets

Investing in U.S. securities markets happens within a legal structure that Congress built after the 1929 market crash. The Securities and Exchange Commission carries a three-part mission: protecting investors, maintaining fair, orderly, and efficient markets, and facilitating capital formation, established through the Securities Act of 1933 and the Securities Exchange Act of 1934, according to Investor.gov's overview of the SEC's role. Those laws require companies that publicly offer securities to disclose truthful information about their business, their securities, and the risks involved, and they require brokers, dealers, and exchanges to treat investors fairly and honestly.

Because of that framework, investors have tools to check before they invest. The free search function at Investor.gov lets anyone confirm whether a broker or investment adviser is licensed and registered and review their disciplinary history, and public companies' disclosures are searchable through EDGAR. None of this eliminates the risk that comes with investing, but it gives investors a way to verify who they're dealing with before committing money. Anyone getting started should review the SEC's guidance on avoiding investment fraud and can reach the SEC's investor assistance line at 800-732-0330 with questions before acting.