Module summary
- A share is a slice of legal ownership in a company, with a claim on its profits and usually a vote.
- Orders go through a broker to an exchange during set hours; US trades settle one business day later.
- Returns come from price changes and dividends, and both depend on how the business performs.
A stock market for beginners explanation usually stops at "buy low, sell high". This module goes further: what you acquire when you buy a share, the route an order takes, who keeps a record of your ownership, and how returns are produced. Those mechanics matter more than any tip, because they decide your costs and your protection.
What a share gives you
A company that lists on an exchange divides its ownership into shares and allows them to be traded publicly. Holding one gives you a proportional claim on the company's assets and future profits, and ordinary shares usually carry a vote at general meetings. You are not lending to the company, so there is no promised return: if profits grow, the value of your claim should rise over time, and if the business fails, shareholders are paid last.
That is the key difference from a currency pair or most crypto tokens. A share's price is anchored, however loosely, to a stream of earnings that analysts can estimate. Our module on reading the stock market explains the ratios built on that link.
Exchanges, brokers and custody
Exchanges such as the NYSE and Nasdaq in New York, the London Stock Exchange, Xetra in Frankfurt and the Tokyo Stock Exchange run central order books during published hours. New York trades from 09:30 to 16:00 local time; London from 08:00 to 16:30; Tokyo from 09:00 to 11:30 and again from 12:30 to 15:30.
Private investors reach these markets through a licensed broker. The broker routes your order, then records the shares in your name within a nominee account that must be kept separate from its own money. If the broker becomes insolvent, those assets are ring-fenced for clients, and many countries operate a compensation scheme for shortfalls up to a limit. Some providers offer CFDs on shares instead; with a CFD you have price exposure but no ownership, no vote and a different set of risks.
Placing an order
| Order type | What it does | Trade-off |
|---|---|---|
| Market | Buys or sells now at the best available price | Certain to fill in liquid shares, but the price is not fixed |
| Limit | Buys at or below, or sells at or above, a price you set | Price is controlled, but the order may never fill |
| Stop | Becomes a market order once a trigger price trades | Useful for exits, but can fill well past the trigger in a gap |
Every quote has a bid and an ask. In large, heavily traded companies the gap is tiny; in small companies it can be a meaningful cost on each trade. The trading costs module shows how spreads, commissions, stamp duty or transaction taxes and currency conversion stack up.
Settlement and the day-trading rules
US equity trades settle on T+1, one business day after the trade. Until then the trade is agreed but ownership has not formally transferred, which is why sale proceeds may not be withdrawable immediately.
US margin accounts were long subject to the pattern day trader rule, which required $25,000 of equity for anyone making four or more day trades in five business days. On 14 April 2026 the SEC approved FINRA's replacement, effective 4 June 2026, which applies intraday margin requirements instead of the fixed threshold. If you trade US shares through a margin account, check how your broker has implemented the change.
How returns are produced: a worked example
Illustrative numbers only. You buy 40 shares at $62.50, a cost of $2,500 before fees. The company pays a quarterly dividend of $0.45 per share.
- Each quarter the dividend is 40 × $0.45 = $18, or $72 over a year.
- That is a dividend yield of $72 ÷ $2,500 = 2.88% on your purchase price.
- If the share price falls to $58.00, your holding loses 40 × $4.50 = $180, a fall of 7.2%, which more than wipes out a year of dividends.
Dividends go to whoever holds the share before its ex-dividend date. Buying on or after that date means the upcoming payment goes to the seller, and the share price typically adjusts downward by roughly the dividend amount on that morning.
Indices: the market in one number
An index summarises a group of shares. The S&P 500 covers around 500 large US companies weighted by float-adjusted market value; the Dow Jones Industrial Average follows 30 companies and is weighted by price; the Nasdaq-100 holds the largest non-financial companies on Nasdaq; the FTSE 100, DAX and Nikkei 225 play similar roles in London, Frankfurt and Tokyo. Weighting method changes what an index tells you, which is why a day can look strong on one and flat on another. Index funds and ETFs let investors hold a whole index in a single product.
The risks to keep in view
- Company risk. A single business can disappoint badly; spreading holdings reduces the damage any one can do.
- Market risk. Broad sell-offs pull almost everything down together, whatever the individual stories.
- Currency risk. Buying shares priced in another currency adds a forex exposure on top of the share itself.
- Leverage. Share CFDs for UK and EU retail clients are capped at 5:1, and even that multiplies losses fivefold.
Investing and trading are different activities
The same share can be held for ten years or ten minutes, and the two approaches need different skills. Long-term investors are mainly concerned with the business: its earnings, balance sheet, competitive position and the price paid relative to those. Short-term traders care more about liquidity, volatility, news timing and costs, because small differences in execution add up over many trades. Mixing the two, for example holding a losing short-term trade "for the long term", is a common way to end up with a portfolio nobody planned.
Decide which activity you are doing before you buy, and choose the account type, costs and time commitment to match.
Where company information comes from
Listed companies must publish regular reports: annual and interim results, and announcements of anything that could move the share price. In the US these are filed with the SEC; in the UK they appear through regulated news services. These documents are the primary source for any claim about a company's profits, debts or prospects. Commentary, forums and social media are secondary at best. When a claim about a company cannot be traced back to one of its own filings, treat it with caution.
Costs of owning shares over time
Apart from dealing commissions and spreads, long-term holders may pay a platform or custody fee, often charged as a percentage of the portfolio each year, and currency conversion fees on overseas shares and their dividends. Some countries levy a tax on share purchases, and dividends may be subject to withholding tax when paid across borders. Tax-advantaged accounts exist in many countries; in the UK, for example, the ISA allowance is £20,000 for the 2026/27 tax year. Our cost module shows how to compare these charges.
Questions from readers
Do I need a lot of money to buy shares?
No fixed amount is required. Many brokers allow small purchases and some offer fractional shares. What matters more is that costs stay small relative to the amount you invest.
What happens to my shares if my broker goes bust?
With a regulated broker, client shares should be held separately and returned to you. Compensation schemes in many countries cover shortfalls up to a limit, but rules differ, so check the scheme that applies to your broker.
Is a share CFD the same as owning the share?
No. A CFD tracks the price, but you have no ownership, no voting rights, and you pay financing to hold it. It is also usually leveraged, which increases risk.
Sources
- US Securities and Exchange Commission, T+1 settlement cycle rule
- SEC approval of FINRA day-trading margin rule changes, April 2026
- European Securities and Markets Authority, CFD product intervention measures