A US equity is a share of ownership in a corporation based in the United States. Buy one and you own a small piece of that company’s future profits and assets, with returns coming from price appreciation, dividends, or both. The two largest venues where these shares trade, the New York Stock Exchange and the Nasdaq, together list thousands of companies, and specific market rules and federal tax laws govern how ownership, trading, and returns actually work.
What You Actually Own
Owning equity is not the same as lending money. A bondholder is a creditor with a fixed repayment and interest. An equity holder is an owner, with no guaranteed return and no repayment date. Upside is theoretically unlimited if the company grows. Downside is real if it doesn’t.
In exchange for that risk, common equity holders get voting rights on major corporate decisions, including electing the board of directors, plus a residual claim on the company’s assets. Residual is the key word: if the company is ever liquidated, equity holders get paid last, after all creditors and bondholders.
The protection that makes equity investing practical for ordinary people is limited liability. Your maximum possible loss is what you paid for the shares. If the company goes bankrupt, its creditors cannot come after your personal bank account or home. The company’s obligations are legally separate from yours.1Legal Information Institute. Limited Liability
Common Stock and Preferred Stock
Common stock is what most people mean when they say “stock.” It carries voting rights and a share of any dividends the board decides to pay, though those dividends are never guaranteed and can vary quarter to quarter.
Preferred stock works differently. Preferred shareholders receive a fixed dividend that must be paid before common shareholders receive anything, which makes preferred behave more like a bond and appeals to income-focused investors. The trade-off is that preferred shareholders usually give up voting rights. With cumulative preferred stock, any skipped dividends pile up and must all be paid before common stockholders see a dime.
How Size Changes the Risk Profile
Market capitalization is the total dollar value of a company’s outstanding shares, calculated as share price multiplied by shares outstanding. Investors use it to sort companies into size tiers with different risk-and-reward personalities:
- Large-cap: $10 billion to $200 billion in market value. Established companies with steady revenue and lower volatility.
- Mid-cap: $2 billion to $10 billion. Often in a significant growth phase, balancing expansion potential against moderate risk.
- Small-cap: $250 million to $2 billion. Higher growth potential, but substantially more volatility and a greater failure rate.
FINRA also recognizes mega-cap stocks above $200 billion and micro-cap stocks below $250 million at the extremes.2FINRA. Market Cap Explained Smaller companies also tend to have less liquid shares, so a large buy or sell can move the price against you.
If a single share of a large-cap company costs $500 and that’s more than you want to commit, many brokerages now let you buy a fraction of a share. Fractional owners may not receive voting rights, and policies vary by firm.3FINRA. Investing in Fractional Shares
How You Buy and Sell One
You can’t walk onto an exchange floor and buy shares yourself. You open a brokerage account, and the broker routes your orders to an exchange or alternative trading system. Most brokerages charge zero commissions on standard stock trades today, though execution quality still affects the price you actually get.
When you place a trade, you choose an order type:
- Market order: Executes immediately at the best available price. The trade is guaranteed to happen; the exact price is not, especially in fast-moving markets.
- Limit order: Sets a maximum you’ll pay when buying or a minimum you’ll accept when selling. You control the price, but the trade may never execute if the market doesn’t reach your target.
After your order fills, the trade goes into settlement, which is the formal transfer of ownership and funds. Since May 28, 2024, the standard settlement cycle for US equities has been T+1: one business day after the trade date, shortened from the previous T+2.4Investor.gov. New T+1 Settlement Cycle – What Investors Need To Know The practical effect: funds from a sale are available the next business day rather than two days out.
How the Returns Come In
Equity investors earn returns two ways: the stock price rises, or the company pays dividends. Most long-term wealth from equities comes from the combination, especially when dividends are reinvested.
Capital Gains
A capital gain occurs when you sell a stock for more than you paid. How long you held it decides the tax rate. Sell after more than a year and the gain qualifies as long-term, taxed at preferential rates of 0%, 15%, or 20% depending on your income.5Internal Revenue Service. Topic No. 409, Capital Gains and Losses For 2026, single filers pay 0% on long-term gains up to $49,450 of taxable income, 15% up to $545,500, and 20% above. Joint filers reach the 15% rate at $98,900 and the 20% rate at $613,700. Sell before the one-year mark and the gain is short-term, taxed at your ordinary income rate, which is almost always higher.
Dividends
Dividends are cash payments a company distributes to shareholders, usually quarterly, from its profits. Not every company pays them. Fast-growing companies often reinvest earnings instead, while established companies use dividends to attract income-focused investors.
Qualified dividends are taxed at the same preferential rates as long-term capital gains. To qualify, you must hold the stock for more than 60 days during the 121-day period beginning 60 days before the ex-dividend date. Ordinary dividends that don’t meet the holding requirement are taxed at your regular income rate.
Many companies offer dividend reinvestment plans (DRIPs), which automatically use your cash dividends to buy additional shares. Reinvestment accelerates compounding, and most plans don’t charge fees on the purchase.
Tax Rules That Catch Investors Off Guard
A few equity tax rules trip up new investors often enough to deserve their own attention.
The Wash Sale Rule
Sell a stock at a loss and buy the same or substantially identical security within 30 days before or after the sale, and the IRS disallows the loss deduction. The window runs in both directions, creating a 61-day blackout around the sale.6Internal Revenue Service. Publication 550 (2025), Investment Income and Expenses The loss isn’t permanently gone; it gets added to the cost basis of the replacement shares. But you can’t use it to offset gains that year. The rule also applies if your spouse buys the stock, or if you repurchase it inside an IRA.7Office of the Law Revision Counsel. 26 USC 1091 – Loss From Wash Sales of Stock or Securities
The $3,000 Capital Loss Cap
When capital losses exceed capital gains in a given year, you can use the excess to offset up to $3,000 of ordinary income ($1,500 if married filing separately). Any remaining losses carry forward to future tax years indefinitely.5Internal Revenue Service. Topic No. 409, Capital Gains and Losses The $3,000 cap has been the same since 1978 and isn’t adjusted for inflation, so investors with large realized losses can spend years working them off.
Net Investment Income Tax
Higher-income investors face an additional 3.8% surtax on net investment income, including capital gains and dividends. The tax applies when modified adjusted gross income exceeds $200,000 for single filers or $250,000 for married couples filing jointly.8Internal Revenue Service. Net Investment Income Tax Those thresholds are not inflation-adjusted, so more taxpayers cross them each year. The 3.8% sits on top of whatever capital gains or dividend rate you already owe, meaning a high-income investor in the 20% long-term bracket effectively pays 23.8%.
Risks You Should Know
Every dollar in equities carries risks that don’t exist with a savings account or Treasury bond.
Market risk hits all stocks at once. When the whole market drops because of a recession, a geopolitical crisis, or a rate shock, even well-run companies lose value. You can’t diversify market risk away.
Company-specific risk is the opposite. A single company might lose a key customer, face a lawsuit, or botch a product launch. Those events can crush one stock while the broader market keeps moving. This risk you can manage through diversification: holding equities across industries and sectors. Index funds and ETFs that track broad indexes offer a straightforward way to build that diversification without picking individual stocks.
Volatility risk is the price of equity returns. Stocks fluctuate daily, sometimes several percentage points in a single session. Over decades, that volatility tends to smooth out. Over a year or two, a badly timed downturn can force you to sell at a loss.
Corporate Actions That Change Your Shares
Companies sometimes take actions that change what you hold, even when you haven’t bought or sold anything.
A stock split increases the number of shares you own while proportionally reducing the price per share. Hold 100 shares at $200 each and the company does a 2-for-1 split, and you’ll have 200 shares at $100 each. Total value is unchanged. Companies split to bring the per-share price to a more accessible level. A reverse split does the opposite, consolidating shares to raise the price, often to meet exchange listing requirements.
Spin-offs occur when a company separates a division into an independent public company and distributes new shares to existing shareholders. In a tax-free spin-off, you reallocate your cost basis between the two companies. In a taxable spin-off, the distribution is treated as a dividend and taxed at the fair market value of the shares you receive.
Investor Protections
The US equity market is one of the most heavily regulated financial systems in the world. Two protections in particular are worth knowing.
Since June 30, 2020, the SEC’s Regulation Best Interest has required broker-dealers to act in your best interest when recommending securities or investment strategies. The broker cannot put its own financial interest ahead of yours, and the standard covers disclosure, care, and conflict management.9U.S. Securities and Exchange Commission. Regulation Best Interest Boundary: this applies to recommendations. An unsolicited trade you place on your own isn’t covered.
If your brokerage firm fails financially, the Securities Investor Protection Corporation (SIPC) protects your account up to $500,000, including a $250,000 limit for cash. It covers the securities and cash the firm can’t return.10Securities Investor Protection Corporation (SIPC). What SIPC Protects SIPC does not cover losses from investments declining in value, and it doesn’t cover bad investment advice. It’s insolvency insurance for the brokerage, not a backstop against market losses.