What Are Stocks and Shares? How the Stock Market Works

Stocks and shares are ownership interests in companies. Buying an ordinary share generally gives the holder an economic claim on the business’s residual value and, depending on the share class and jurisdiction, voting and dividend rights. A stock exchange provides a market in which existing shares can change hands, but a share’s quoted price is not the same thing as the company’s revenue, profit, cash balance or intrinsic value.

Understanding equities starts with four questions: what does the holder own, how are shares issued and traded, what determines their value, and what could cause the holder to lose money? This guide explains those mechanisms using straightforward financial examples. The examples are hypothetical and are not live prices or trading recommendations.

What is a stock or share?

A share is a unit of equity capital representing a defined interest in an incorporated business. The terms stock, shares and equities frequently overlap in everyday financial language. In the UK, “shares” is particularly common; US market commentary often speaks of “stocks”. The precise legal rights depend on the company’s constitution, the security’s terms and applicable law.

Ordinary shareholders usually rank behind the company’s lenders and other creditors if the business is wound up. They own a residual economic interest, not a personal right to take a proportional amount of the company’s cash, property or machinery. A company can be profitable without paying a dividend, and a stock price can fall even when sales are increasing. Equity is therefore fundamentally different from a contractual debt claim.

Consider a hypothetical company with 100 million ordinary shares outstanding. A holder of 100,000 shares owns 0.10% of that ordinary-share class, assuming all shares carry equivalent rights. This percentage may change if the company subsequently issues more shares, repurchases some shares or changes its capital structure. It does not mean the investor can withdraw 0.10% of the company’s bank account.

Why do companies issue shares?

Businesses issue shares to raise permanent or long-term capital, finance expansion, acquire other companies, fund research or strengthen a balance sheet. Unlike a conventional loan, issuing ordinary equity does not usually create a mandatory interest-payment obligation or fixed repayment date. However, issuing new shares distributes ownership among more holders and may dilute existing shareholders’ voting power and claims on future earnings.

In a primary-market transaction, the company issues securities and receives the proceeds, subject to fees and transaction terms. An initial public offering (IPO) is one possible route into public markets, although IPOs can also include existing investors selling their shares. A follow-on offering, rights issue or private placement may raise further capital after an IPO.

In the secondary market, investors normally trade existing shares with one another through exchanges, brokers and other venues. The issuing company generally does not receive the cash paid for each ordinary secondary-market purchase. That distinction is vital: a stock can trade heavily on a particular day without the underlying company raising fresh funds.

What rights do shareholders actually have?

The shareholder’s rights depend on whether the security is ordinary, preference or another special class of share. Ordinary equity often carries voting rights over directors or significant company decisions, although dual-class structures can concentrate votes in the hands of founders or other holders. Dividend distributions are commonly discretionary and may be reduced, suspended or cancelled.

Rights depend on the instrument, issuer documents and legal structure; this is a conceptual comparison.

Owning a company’s common equity is not the same as holding an ETF, derivative or deposit. An equity ETF generally owns a basket of underlying securities through a fund structure; its investor owns units or shares in the fund. A CFD is a leveraged contract with a provider, rather than direct ownership in the reference company. These differences affect dividends, custody, voting and counterparty risk.

How does the stock market work?

The stock market is a collection of venues and intermediaries through which investors buy and sell listed securities. A customer normally submits an order to a broker, which then routes or executes that order under applicable rules. An exchange may match buyers and sellers by price and time priority or another published rule. Some orders execute on alternative venues rather than on the primary listing exchange.

A bid is an executable buying price subject to size and venue conditions; an ask or offer is a selling price. The difference is the bid–ask spread, one component of transaction cost. For example, a hypothetical quote of £4.98 bid and £5.02 ask has a £0.04 quoted spread. A buyer paying the ask and immediately selling at the bid would lose £0.04 per share before any commission, market movement or other charges.

A market order prioritises execution, not a guaranteed execution price. A limit order specifies a maximum buying price or minimum selling price but may not execute. Order types, market depth, auction mechanisms, spreads and settlement are covered in detail in How Stock Exchanges Work. The US SEC’s investor guide to order types explains the core differences.

How is a share price determined?

The immediate trading price emerges from transactions and executable orders, not from a formula that exchanges apply to all companies. Investors form competing views of earnings, cash flows, growth, valuation, interest rates and risk. Prices change as those expectations, liquidity conditions and willingness to trade change.

Two financially similar businesses can have quite different share prices because the number of shares outstanding differs. Equally, a share priced at £10 is not necessarily cheaper than one priced at £100. Share price alone lacks the information needed to compare a company’s total equity value. See What Moves Stock Prices? for the detailed economic explanation.

Market capitalisation: share price versus company value

Market capitalisation = current share price × ordinary shares outstanding, with care taken over the correct class and fully diluted share count. It expresses the market’s aggregate price for the equity included in the calculation. It is not the same as the firm’s revenue, assets, enterprise value or necessarily the cash that would be received from selling the entire company.

Suppose an illustrative business has 400 million ordinary shares trading at £2.50. Its market capitalisation is 400 million × £2.50 = £1 billion. A second business with 50 million shares trading at £20 also has a £1 billion market capitalisation. The share prices differ by a factor of eight, yet the quoted equity values are the same.

Enterprise value takes the analysis beyond ordinary equity by incorporating net debt and other adjustments, such as relevant non-controlling interests and preferred equity. Comparing operating earnings with enterprise value can be more informative than comparing share prices alone. The methodology is developed in Stock Valuation Explained.

How do investors make or lose money from shares?

An ordinary share can produce a return through price appreciation, cash dividends or both. It can also lose value through a declining share price, a reduction in dividends, insolvency or adverse capital-structure changes. Financial performance is affected by trading costs, currency conversion, withholding taxes and other investor-specific factors.

A simple holding-period return calculation is (ending value − beginning value + cash distributions) ÷ beginning value. Imagine buying one share for £10, receiving a £0.30 dividend, and later selling it for £11.20. Before costs and tax, the holding-period return is (£11.20 − £10 + £0.30) ÷ £10 = 15%. If the ending share price instead falls to £7.80 with the same dividend, the return becomes −19%. Neither outcome is a forecast.

A dividend is not free additional value. When shares trade ex-dividend, their price can adjust downward to reflect the distribution, although actual market movements can be influenced by many simultaneous factors. Similarly, a share buyback can change the number of outstanding shares without guaranteeing a better return for remaining holders. These mechanisms are explained in Dividends, Share Buybacks and Corporate Actions.

How new shares can dilute existing shareholders

Consider the earlier hypothetical business with 400 million shares. An investor holds one million shares, or 0.25%. If the company issues another 100 million equivalent shares to raise capital, the investor still owns one million shares but now holds 1 million ÷ 500 million = 0.20%, provided they do not subscribe for more. The investor’s percentage interest has declined by one-fifth.

That does not automatically mean the company has destroyed economic value. If the issue raises funds that produce attractive returns, the firm’s future cash flows may improve. The key questions are the issue price, proceeds, costs, use of funds, new capital base and per-share value. Ownership dilution and economic value creation are related but not identical.

What makes one stock different from another?

Businesses differ in profitability, growth opportunities, balance-sheet leverage, industry structure, governance, pricing power and capital requirements. A profitable, established company may distribute part of its cash through dividends; a high-growth enterprise may reinvest available resources instead. These are business characteristics rather than fixed labels: so-called growth and value stocks can overlap.

For example, a software business with subscription revenue and relatively modest physical capital expenditure has different financial drivers from a highly cyclical manufacturer that continually invests in expensive equipment. Their earnings and reported cash flows cannot be compared intelligently using a single multiple without considering durability, accounting conventions and financing needs.

The financial statements are the natural starting point. How to Read Company Financial Statements explains the relationship between accounting profits, cash flows and financial health. Use annual reports and official filings rather than relying solely on headlines or social-media posts.

Understanding common share-investment risks

Business risk includes weak demand, competition, execution failures, litigation and changing regulation. Financial risk arises when leverage or refinancing needs strain the business. Market risk captures declines caused by discount rates, recession concerns or wider risk aversion, even if company operations initially remain sound.

Liquidity risk matters when an investor cannot buy or sell a desired quantity near the last displayed price. A smaller company may have a wide bid–ask spread and a thin order book, increasing market impact. Currency risk arises when the investor’s home currency differs from the asset’s denomination. Derivatives can introduce additional leverage, margin-call and counterparty risks.

Equity diversification can reduce the importance of a single company’s failure, but cannot eliminate a market-wide drawdown. Concentrated portfolios may also have hidden common exposures, such as multiple companies relying on the same customers, credit conditions or commodity prices. The SEC’s stock education guide provides an accessible overview of ownership rights and downside risk.

A practical process for evaluating a stock

1. Understand the business: identify its products, customers, economic model, markets and competitors.
2. Read official accounts: compare revenue, profit, cash flow, liabilities and share count over time.
3. Evaluate valuation: separate stock price from market capitalisation, enterprise value and assumptions about future earnings.
4. Assess expectations: consider what the market may already have priced into the shares.
5. Check liquidity and risk: examine spread, volatility, concentration, product structure and possible adverse outcomes.
6. Document uncertainty: identify the evidence that would support or invalidate an investment hypothesis.

A broader analytical approach combines company fundamentals with sentiment, technical market behaviour, risk management and psychology. See How to Analyse a Stock Using the Atravix Six-Pillar Framework for a structured application.

Ownership through brokers, nominees and custodians

For many investors, shares are held through a broker or nominee rather than appearing directly in the individual’s name on the issuer’s register. The legal holding arrangement can affect how voting instructions, dividend payments and corporate-action elections are processed. Beneficial economic exposure may be straightforward even though the chain of custody involves several intermediaries. Check the broker’s terms rather than assuming that every account provides identical voting or transfer facilities.

Recordkeeping also matters when a company reorganises its securities, changes domicile or offers shareholder elections. The broker may impose an operational deadline earlier than the issuer’s published deadline. A trader holding a derivative linked to the stock may have no shareholder vote at all. The legal and practical distinctions can become especially important during tender offers, rights issues or exceptional corporate actions.

Separating the investment thesis from the trading vehicle

A long-term assessment may suggest that the business has attractive economics, but the available trading vehicle can change the realised outcome. Direct shares, an ETF tracking a sector, an option and a CFD have different payout structures, costs, liquidity characteristics and legal rights. An investor who understands the company but not the instrument can still misunderstand their exposure.

For international equities, consider how the quoted currency interacts with the investor’s home currency. Suppose a US share rises 10% in dollars while the dollar falls approximately 8% against sterling over the same holding period. Ignoring costs and using consistent currency conversions, the sterling return is approximately 1.10 × 0.92 − 1 = 1.2%, not 10%. The result depends on the precise quotation convention and exchange-rate dates.

Fees and turnover matter too. Repeatedly trading a share incurs spread, commission and possibly currency-conversion costs, while holding it exposes the investor to changing company and market risks. Neither approach removes uncertainty. A strong education process separates the economic asset, the instrument used to gain exposure and the time horizon over which success or failure will be assessed.

Frequently asked questions about stocks and shares

Is a share the same as a stock?

In ordinary financial usage, the words are often interchangeable. A “share” can refer to a unit of ownership in one company, while “stock” is often used collectively or in US market terminology. Actual rights always depend on the class of security.

Do shareholders own the company’s assets directly?

No. The company owns its assets as a separate legal entity. Shareholders hold shares in that entity and generally have a residual economic claim after creditors, not personal title to particular equipment or bank deposits.

Can a profitable company’s stock fall?

Yes. A share may fall because the profit was below expectations, future growth forecasts weaken, interest rates rise, the valuation multiple contracts or investors become less willing to bear risk. A profit number has to be interpreted relative to expectations and the share’s price.

Does a low share price mean a company is cheap?

No. A low nominal share price may reflect a large number of outstanding shares or weak business prospects. Compare market capitalisation, financial performance, liabilities and valuation instead of ranking stocks by their price per share.

Are owning shares and trading CFDs equivalent?

No. Shares provide an ownership interest; CFDs are derivative contracts reflecting price movements with a provider. CFDs may involve leverage, financing charges, different corporate-action treatment and elevated loss risk.

Key takeaways

Stocks and shares represent equity ownership. Their price responds to changing expectations and transactions in the market, while market capitalisation expresses the value of the outstanding equity at current prices. A professional analysis must consider ownership rights, cash flows, valuation, capital structure, liquidity and the risk of permanent or temporary losses—not simply whether a chart appears to be rising.

Sources and further reading

• US Securities and Exchange Commission — Stocks and shares.
• SEC Investor.gov — How Stock Markets Work.
• SEC Investor.gov — Types of Orders.
• SEC — Beginners’ Guide to Financial Statements.

Further structured learning: Explore the Applied Professional Stock Trading Mini MBA for more systematic education in stock market structure, company analysis and risk management. This course provides education, not trading signals or personalised financial advice.

Important notice: This article is general financial education, not financial advice, a recommendation, a financial promotion to transact or a guarantee of future returns. Shares and derivatives can fall substantially in value, and leveraged instruments may cause rapid losses. All calculations are hypothetical teaching examples.