Stocks and Shares

What a Share Actually Is

A share is a unit of ownership in a company. When a business wants to raise money without taking out a loan, it can divide itself into a fixed number of equal pieces and sell those pieces to investors. Each piece is a share. Buy one, and you own a small, precisely measurable fraction of that company — its buildings, its equipment, its brand, its future profits, and, if things go badly, its losses.

This is not an abstract legal technicality. If a company has 10 million shares in issue and you own 1,000 of them, you own exactly 0.01% of that company. You're entitled to 0.01% of any dividend it pays. If the company is bought out by a larger competitor, you receive 0.01% of the agreed sale price for your shares. If it goes bankrupt and its assets are sold off to repay creditors, you are entitled to 0.01% of whatever is left after everyone the company owes money to has been paid first — which, in a genuine insolvency, is very often nothing at all, because shareholders sit at the back of the queue.

Shares, stocks, and equities are the same thing described with different words. "Stock" is the more common American term; "share" and "equity" are used more in the UK, though you will hear all three used interchangeably even within the same sentence by the same person. There is no meaningful distinction to learn here — it is purely a vocabulary difference, not a difference in what you actually own.

A Short History of Why Stock Markets Exist

The modern stock market traces back to 17th-century Amsterdam, where the Dutch East India Company issued shares to the public in 1602 to fund trading voyages that were individually too risky and too expensive for any single merchant to finance alone. Spreading the cost — and the risk — across many investors, each owning a small stake, meant that no single person needed to bet their entire fortune on one ship returning safely from the other side of the world. If it sank, each investor lost only their proportional share of the cost, not everything.

That principle — pooling capital from many people to fund ventures too large or risky for any one person, with ownership and risk divided proportionally — is still exactly what a stock market does today, just at a vastly larger scale and across every industry rather than seaborne trade specifically. The London Stock Exchange formally traces its origins to the 1690s and early 1700s, growing out of merchants and brokers trading shares and government debt in London's coffee houses, eventually formalising into the exchange that exists today, now one of the largest in the world and the primary listing venue for UK companies.

Understanding this history matters for one practical reason: it clarifies what you're actually doing when you buy a share. You are not placing a bet on a number going up or down — that's merely the mechanism by which your return is measured. You are providing capital to a real business, in exchange for a proportional claim on whatever that business goes on to earn. The share price is simply the market's constantly updating estimate of what that claim is currently worth.

How You Make Money from Shares

There are exactly two ways to make money owning shares, and everything else you'll read about investing is a variation or combination of these two mechanisms.

Most large, established, slower-growing companies — banks, utilities, consumer staples, insurers — tend to pay meaningful dividends, because they generate more cash than they can productively reinvest into further growth. Most fast-growing, earlier-stage companies, particularly in technology, pay little or no dividend at all, choosing instead to reinvest every pound of profit back into expanding the business, on the theory that reinvested capital will compound faster than a cash payout to shareholders would. Neither approach is inherently superior — a portfolio that includes both types captures the benefits of each, and the right balance depends heavily on your own goals and time horizon.

Total return is the term used to describe the combination of both mechanisms together — capital growth plus dividends received, reinvested or not — and it's the only number that gives you a complete, honest picture of how an investment has actually performed. A share that pays no dividend but doubles in price has the same total return as a share that rises by a smaller amount but pays substantial dividends along the way, assuming the totals genuinely match — looking at price movement alone, without factoring in dividends, understates the real return of dividend-paying shares specifically.

Why Share Prices Move

In the short term, a share price moves because people change their minds, collectively and continuously, about what the company is worth. In the long term, prices tend to follow earnings — a company that grows its profits year after year will, with very few exceptions, see its share price rise over a long enough horizon, even if the path there is bumpy and inconsistent along the way.

It's worth being explicit about what a share price represents at any given moment: it is the price at which the most recent willing buyer and willing seller agreed to trade, nothing more mystical than that. It reflects the collective, constantly shifting guess of every market participant about what the company's future profits are worth today. When new information arrives — an earnings report, an interest rate decision, unexpected news — that collective guess updates, sometimes gradually and sometimes within seconds, and the price moves to reflect it.

Is a Share Cheap or Expensive? Basic Valuation Tools

A £500 share price tells you almost nothing in isolation — plenty of genuinely expensive companies trade at a few pounds per share, and plenty of reasonably priced ones trade at several hundred, because the price depends entirely on how many shares the company has divided itself into, which is an arbitrary corporate decision rather than a measure of value. To judge whether a share is cheap or expensive, you need to compare its price to something — most commonly, its earnings.

None of these metrics work well in isolation, and none of them tell you with certainty whether a share will rise or fall next. A low P/E can mean genuine value — or it can mean the market correctly expects the company's earnings to decline. A high P/E can mean genuine overvaluation — or it can mean the market correctly expects rapid future growth that will eventually justify today's price. Valuation metrics are a starting point for asking better questions, not a formula that outputs a definitive buy or sell signal.

Market Capitalisation: Sizing Up a Company

Market capitalisation — "market cap" — is simply the share price multiplied by the total number of shares in issue. It represents the market's current collective valuation of the entire company, and it's a far more useful way to compare the size of two companies than comparing their individual share prices, which, as covered above, are arbitrary.

Market cap size correlates reasonably well with volatility and risk — larger companies tend to have more diversified revenue, deeper cash reserves, and more analyst scrutiny, all of which tend to dampen extreme price swings relative to smaller, less-covered companies. This is a general pattern rather than a guarantee; mega-cap companies have gone through severe, multi-year declines, and small-cap companies can occasionally be remarkably stable. But as a broad rule of thumb for calibrating expected volatility, market cap category remains genuinely useful.

Dividend Investing vs Growth Investing

Most individual stock strategies fall broadly into one of two camps, and understanding the difference helps explain why two perfectly reasonable investors can look at the same market and reach completely different conclusions about what's worth buying.

Dividend investing prioritises companies that pay a substantial, reliably growing dividend — UK examples historically include certain utilities, insurers, and consumer staples companies, often informally grouped under the idea of "dividend aristocrats": companies that have grown their payout for many consecutive years. The appeal is tangible, regular cash income, which can be reinvested to buy more shares (compounding the position over time) or taken as actual income, particularly useful for investors closer to retirement who want cash flow without needing to sell their holdings.

Growth investing prioritises companies reinvesting all available profit into expanding the business — often in technology, healthcare innovation, or early-stage consumer brands — accepting little or no dividend income in exchange for the possibility of substantially higher capital growth over time. The appeal is the potential for the share price itself to compound at a faster rate than a dividend-focused portfolio typically achieves, at the cost of receiving no cash income along the way and generally accepting higher volatility.

What Owning a Share Actually Entitles You To

Beyond the financial claim on profits, share ownership typically comes with formal rights, most of which go unused by the average retail investor but are worth knowing about. Common (ordinary) shareholders generally have the right to vote at the company's Annual General Meeting (AGM) on matters such as electing the board of directors, approving executive pay packages, and major corporate decisions like mergers. Each share typically carries one vote, meaning your influence is proportional to your stake — in practice negligible for a small retail holding in a company with billions of shares outstanding, but genuinely significant for large institutional shareholders, who collectively can and do shape company decisions.

Companies also return money to shareholders through share buybacks as an alternative to dividends — the company uses its own cash to repurchase and cancel some of its own shares, which reduces the total number of shares outstanding and, all else equal, increases the proportional ownership (and therefore the value) of every remaining share. Buybacks have become an increasingly common method of returning capital, particularly among large US companies, partly for tax efficiency reasons in jurisdictions where dividend income and capital gains are taxed differently.

If you hold shares through an ISA or a broker's nominee account — the standard way almost all UK retail investors hold shares today — you typically own what's called a "beneficial interest" rather than being registered directly on the company's own shareholder register. Your broker holds the legal title on your behalf and administers voting and dividend payments for you. This doesn't reduce your economic ownership in any way, but it does mean exercising voting rights, where you want to, usually goes through your broker's platform rather than directly with the company.

The Risk of Owning Individual Stocks

Owning shares in a single company is a fundamentally different risk profile from owning a diversified fund holding hundreds of companies, covered in detail in the ETFs chapter. When you concentrate your money in one company, you're exposed to everything that can go wrong with that specific business — not just general market movements.

A fund holding 500 or more companies largely diversifies away these company-specific risks — if one holding suffers a fraud scandal or a catastrophic strategic failure, it represents a small fraction of the total portfolio and the overall impact is proportionally limited. This is precisely why extensive long-run research, including regular industry scorecards comparing professional fund managers against simple benchmark indices, consistently shows that the majority of individual stock pickers — professional and amateur alike — underperform a low-cost diversified index fund over periods of ten years or more.

None of this is an argument that owning individual stocks is always a mistake — many experienced, disciplined investors do it successfully over long periods. It is an argument that doing so carries meaningfully different and generally higher risk than a diversified fund, and that risk should be sized into your portfolio deliberately, rather than discovered after the fact when a single holding goes badly wrong.

How to Actually Buy Shares in the UK

In practice, buying a share involves opening an account with a regulated broker or investment platform, funding it with cash, and placing an order for the shares you want. The main decision upfront is which type of account to use, since this materially affects the tax treatment of any returns.

Once an account is open and funded, placing an order typically involves choosing between a market order (buy or sell immediately at the best currently available price) and a limit order (buy or sell only if the price reaches a specific level you set in advance). Market orders are simpler and execute instantly during trading hours; limit orders give you price control at the cost of the order potentially never executing if the price never reaches your specified level.

Most major UK platforms now offer fractional shares for popular stocks, meaning you don't need the full price of one share to invest — you can commit any amount, say £50, and own a proportional fraction of a single share. This is particularly useful for high-priced individual shares, where a single share can cost several hundred or even several thousand pounds, putting a whole share out of reach for a smaller, regular monthly investment.

Bull Markets, Bear Markets, and Why Staying Invested Matters

A bull market describes a sustained period of rising prices, generally accompanied by optimism about economic growth and corporate earnings. A bear market is formally defined as a fall of 20% or more from a recent peak, generally accompanied by pessimism, and often (though not always) coinciding with or anticipating an economic recession. A smaller decline, of 10–20%, is usually termed a "correction."

Markets have experienced numerous bear markets throughout history, and every single one to date has eventually been followed by a recovery to new highs, though the length of that recovery has varied considerably — from a matter of months to, in rare historical cases, several years. The practical investing lesson most commonly drawn from this pattern is that attempting to predict and trade around these cycles — selling before a downturn and buying back in at the bottom — is extremely difficult to execute consistently, because the strongest recovery days tend to cluster unpredictably within the most volatile, frightening periods, meaning an investor who sells during a downturn risks missing the sharpest days of the subsequent rebound.

Common Mistakes New Stock Investors Make

Trying to time the market. Waiting for "the right moment" to buy, or selling in anticipation of a downturn, requires being right twice — correctly predicting the top and correctly predicting the bottom. Very few investors, professional or otherwise, manage this consistently over time, and the cost of being wrong is usually missed growth rather than avoided losses.

Over-concentrating in a single stock or sector. A large position in one company, or several companies within the same industry, means a single piece of bad news can meaningfully damage an entire portfolio. Diversification across companies, sectors, and geographies is the most reliable way to reduce company-specific risk.

Chasing recent performance. A stock that has risen sharply over the past year attracts attention precisely because it has already risen — which tells you very little about whether it will continue to rise from here, and can mean you're buying in after most of the gain has already happened.

Panic-selling during a downturn. Selling after a sharp fall locks in the loss and forfeits any chance of participating in the eventual recovery. The investors who do best over full market cycles are typically those who maintain their position (or continue buying at lower prices) through the downturn, rather than those who react emotionally to short-term volatility.

Ignoring fees and trading costs. Frequent trading, particularly across multiple small positions, accumulates transaction costs and can trigger more frequent taxable events outside an ISA. These costs compound over time in the same way investment fees do, quietly eroding returns that would otherwise have been left to grow.

A Worked Example: Individual Stocks Alongside a Core Fund

Many experienced investors use what's informally called a "core and satellite" approach — the bulk of a portfolio held in a diversified index fund (the "core," covered in detail in the ETFs chapter), with a smaller portion allocated to individual stock picks the investor has a specific view on (the "satellite" positions). This structure lets you participate in individual stock selection, which some investors find genuinely engaging and educational, while keeping the majority of the portfolio protected from company-specific risk.

On a £10,000 portfolio built this way, £8,000 sits in the diversified core, doing the steady compounding work covered throughout this site, while £2,000 is split across, say, six individual companies across different industries — perhaps £350–£400 each. If one of those six individual positions performs poorly, or even goes to zero in an extreme case, the damage to the overall £10,000 portfolio is capped at roughly 3-4%, a meaningfully different outcome from the same loss happening to a portfolio that was 100% concentrated in individual stocks from the start.

Volatility Is Not the Same Thing as Risk

These two words get used interchangeably in everyday conversation, but they describe genuinely different concepts, and conflating them leads to some common investing mistakes. Volatility simply measures how much a price moves around, in either direction, over a given period — a share that swings between £8 and £12 repeatedly over a year is more volatile than one that sits steadily between £9.50 and £10.50, regardless of where either one ends up.

Risk, in the more meaningful sense, is the possibility of a permanent, irreversible loss of capital — the company fails, the business model becomes obsolete, the money is genuinely gone and isn't coming back. A share can be highly volatile without being especially risky in this deeper sense, if the underlying business remains fundamentally sound and the price swings are driven by short-term sentiment rather than any real deterioration in the company's prospects.

This distinction matters practically because many new investors treat volatility itself as the enemy — selling a perfectly healthy holding purely because its price has swung downward sharply, without any change to the underlying business. For a long-term holder with a time horizon of many years, short-term volatility in a fundamentally sound holding is largely irrelevant noise; what matters is whether the business itself remains sound. For a short-term holder who might need the money within a year or two, volatility matters a great deal, because there's less time available to ride out a temporary downturn before the money is needed.

Investing Beyond the UK: Currency and Global Exposure

The UK stock market — represented broadly by the FTSE 100 and FTSE 250 — makes up a relatively small fraction of total global stock market value, heavily weighted toward banks, energy, mining, and consumer staples companies, with comparatively limited exposure to large technology companies compared with, say, the US market. For this reason, many UK investors choose to hold a meaningful portion of their individual stock or fund exposure outside the UK, to access sectors and growth opportunities that are simply underrepresented on the domestic market.

Buying shares listed on a foreign exchange — a US company listed on the NYSE or NASDAQ, for instance — introduces currency risk on top of the normal share price risk already covered in this chapter. If you buy a US share priced in dollars and the pound strengthens against the dollar before you sell, your return in pounds will be lower than the share's return measured in dollars, even if the share price itself didn't move at all — and the reverse is equally true if the pound weakens. Over long holding periods, currency movements tend to partially average out, but over shorter periods they can meaningfully amplify or offset the underlying investment return.

Most UK brokers handle the currency conversion automatically when you buy or sell a foreign-listed share, typically applying a small conversion fee or spread on top of the prevailing exchange rate. For investors who want diversified international exposure without personally picking individual foreign stocks or managing currency conversion themselves, a globally diversified index fund (covered in detail in the ETFs chapter) achieves this automatically, spreading currency exposure across many countries and currencies simultaneously rather than concentrating it in a single foreign market.