What a Stock Is and Why Markets Exist

A share is a slice of ownership

A share of common stock is a **residual claim** on a business: shareholders own what is left after employees, suppliers, lenders and taxes are paid. That makes stock riskier than a loan to the same company, and it is why stocks have historically earned more over long periods. Owning a share gives you three things: a proportional claim on earnings and assets, a vote on directors and major decisions (usually one vote per share), and **limited liability**. Without borrowing, the most you can lose is what you paid. • Claim: you get whatever is left, in proportion to your shares • Vote: usually one vote per share, exercised directly or by proxy • Limited liability: you cannot be made to cover the company’s debts Worked example: your slice — Company net income: $500M · Shares outstanding: 100M · Earnings per share (EPS): $5.00 · Your 10 shares’ claim on earnings: $50 per year ← That $50 does not arrive in your account. The board decides whether to pay a dividend or reinvest it. Either way it belongs to shareholders, and reinvested earnings should show up in a higher value per share over time.

Price, market cap and why one number is not the other

Two prices tell you different things. The **share price** is what one share costs. The **market capitalisation** is the share price multiplied by the shares outstanding — the market’s estimate of what the whole equity is worth. This matters because share price on its own is an accounting accident. A company can split its stock ten-for-one, cutting the price by 90%, and nothing about the business changes. Compare companies by market cap, not by sticker price: a $5 stock with two billion shares outstanding is a far bigger company than a $400 stock with ten million. Same business, two ways — Shares outstanding: 10M · Share price: $400 · Market cap: $4B ← · After a 4-for-1 split: 40M shares at $100: still $4B ← Market cap is the language of position sizing, index weighting and every screener you will use later. Share price only decides how much cash one share mobilises.

Primary vs secondary markets

In the **primary market**, a company sells new shares and receives the cash: an initial public offering (IPO), or later follow-on and at-the-market offerings. Underwriting banks typically charge several percent of the money raised for arranging it. In the **secondary market**, existing shares change hands between investors. Daily trading volume on U.S. exchanges is vastly larger than new issuance, and none of that trading sends money to the company. • Primary: the issuer sells, the company receives cash, existing holders are diluted • Secondary: investors trade with each other, the company receives nothing • The issuer cares about the secondary market because liquidity lowers the cost of raising capital next time Every trade has two sides. When a stock falls it is not that there were “more sellers than buyers” — share counts always match. It is that sellers were more **urgent**, and had to accept lower prices to find buyers.

Total return, and the two ways cash comes back

A return on a share can only arrive in two forms: the price changes, or the company hands you cash. Everything else that looks like a return — a split, a bonus, a stock dividend — is arithmetic on the number of slices rather than a change in the pie. The two ways of handing cash back do different things to your position. A **dividend** pays every holder in cash, and the share price falls by roughly the dividend on the ex-date, because the cash is no longer inside the business. You keep the shares and receive the cash, and in most accounts you owe tax on it in the year it is paid. A **buyback** spends the same money in the market, leaving fewer shares outstanding — so your percentage ownership of the same earnings rises without you doing anything. You receive nothing, the tax is deferred until you sell, and the arithmetic only works in your favour if the shares were bought below their value. The consequence for how you measure things is the part beginners miss. A stock’s quoted price return excludes dividends, so a company yielding 4% whose price is flat has still paid you 4%. **Total return** — price change plus distributions, with distributions assumed reinvested — is the only figure comparable across a dividend payer and a non-payer, and it is what an index like the S&P 500 total-return series reports. Compare price charts to price charts, but value a holding on total return, because that is what you actually received. The same $100 of earnings, two decisions — Price return excluded dividends, flat year: a 4% yielder still paid 4% · Total return, distributions reinvested: the only comparable figure across payers and non-payers ← · A $100m buyback at 4× earnings: fewer shares, same earnings: earnings per share rises · The same $100m paid as a dividend: cash in hand, taxed now, share count unchanged · A four-for-one split: nothing: four times the shares at a quarter of the price ← A price chart is a record of the shares. Your account statement is a record of the position, and those two versions of the same year can differ by the whole dividend.

The share count is not a constant

Everything above treats “shares outstanding” as a fixed number. It is not. The board can authorise more and issue them — to employees as stock-based compensation, to investors in a follow-on offering, to the sellers in an acquisition — and every new share divides the same pie into thinner slices. That is **dilution**, and it is why a company can report rising net income while its earnings *per share* barely move. Three numbers matter and they are not the same. **Authorised** shares are the ceiling written into the charter, and the company cannot issue past it without a shareholder vote. **Issued** shares have been sold at some point; **outstanding** shares are issued minus any the company has repurchased and holds in treasury, and only outstanding shares carry a claim on earnings. **Float** is the subset of outstanding shares available to trade — it excludes restricted stock held by founders and insiders, so a company with a thin float can move violently on modest volume. The practical lesson is that you own a *fraction*, not a number of shares, and that fraction is under continuous negotiation. A buyback shrinks the denominator and raises your claim; an issuance grows it and cuts your claim. When you read any per-share figure, ask what the share count did to produce it. Four numbers, one company — Authorised: the charter ceiling on issuance · Issued: everything sold to date · Outstanding: issued less treasury shares — what carries your claim · Float: outstanding less restricted and insider-held shares ← Stock-based compensation is dilution that arrives quietly: the company pays employees in new shares, expenses the value, and the share count drifts up every quarter. A buyback that only offsets that drift is not returning cash — it is standing still.

Not every share is the same share

“A share” is shorthand, and for a large number of companies it is shorthand for more than one thing. Where a company has issued more than one class of common stock, the classes differ in the only respect that makes ownership political: how many votes each share carries. The economic claim can be identical — the same dividend, the same residual on the same earnings — while the power is not, and two investors holding the same number of shares can have very different influence over the company. **Dual-class structures** are the common form. The founders or the family hold a class carrying ten or twenty votes per share, and the public holds a class carrying one. It exists so that a company can raise outside capital without surrendering control, and it is disclosed on the first pages of the registration statement and set out in the charter. The consequence for an ordinary buyer is that a vote is worth what the structure says it is worth, and that index providers have had to decide case by case whether a non-voting or low-vote class belongs in an index at all. **Preferred stock** is a different instrument wearing a similar name. It sits ahead of the common in the queue: its dividend is usually a stated amount that must be paid before any common dividend, and on a liquidation its claim is satisfied first. In exchange it typically gives up much of the upside and the vote, and it is frequently callable by the company and convertible into common. That combination makes it behave like a hybrid — a bond-like claim carrying equity risk — and it is the reason preferred shares often trade on yield and on credit conditions rather than on the earnings the common holders are watching. What an ordinary share actually confers is narrower than most new owners assume: a residual claim on earnings and assets, arrived at last after everyone else in the capital structure; a vote in whatever proportion the class specifies; a right to the information the company is obliged to disclose; and, in many jurisdictions outside the United States, a pre-emptive right to participate in new issues. It does not confer control of the business, access to its cash, or any entitlement to a dividend — the board decides whether one is paid, and it can stop paying one whenever it chooses. Two practical consequences follow. Index membership and market capitalisation have to be computed across classes, using each class at its own price and its own count, which is why a headline share count is such a poor guide to a company’s size. And the class structure is one of the few facts about a company that generally cannot change without a shareholder vote — which is exactly why it is worth finding before you own the shares rather than afterwards. • Multiple classes of common stock differ in votes, not necessarily in economic claim. • Preferred stock ranks ahead of common on dividends and liquidation, and gives up upside for it. • A common share is a residual claim arrived at last, plus a vote and a disclosure right. • Market capitalisation has to be summed across classes at their own prices and counts. The details of a company’s capital structure — the classes, their votes, the preferred’s dividend and call terms — are in the charter and the financial statements rather than in the marketing. Reading them once, before buying, answers questions that cannot be answered later.

What markets are for

Markets do three jobs. **Price discovery**: prices aggregate the information and opinions of millions of participants. **Liquidity**: you can turn shares into cash quickly and cheaply. **Risk transfer**: someone who wants less risk can sell it to someone who wants more. Prices move when new information changes what buyers and sellers will accept. That is why good news released before the open shows up as a gap: the price adjusts before anyone can trade at the old level. Liquidity is why a company that receives nothing from each trade still cares about the secondary market: investors pay more for shares they can easily sell, which lowers the issuer’s cost of capital next time.

Where a stock return actually comes from

A share price is a claim on future cash flows discounted back to today, so a return can only arrive from two places. The first is the **business**: earnings grow, and some of that cash is paid to you as dividends or buybacks. The second is the **multiple**: the price other investors are willing to pay for each dollar of earnings changes. The first is a fact about the company. The second is an opinion about the company, and opinions move faster. This is the single most useful decomposition a new investor can learn, because it separates the two arguments that otherwise get bundled into “is this a good company?”. A business can compound earnings for a decade and still lose you money if you paid a multiple that later falls. A mediocre business can make you money if the multiple you paid was low enough. Both happen every year, and the same stock can be a great company and a poor investment at the same time. The arithmetic is short enough to do on the back of an envelope: earnings per share growth, plus the dividend yield, plus the change in the multiple, is your return. Nothing else is available. One year, one stock: earnings up 8%, and you still lose money — Earnings per share: $5.00 → $5.40 (+8%) · Dividend received: $1.00 (+1%) · P/E the market pays: 20 → 17 (−15%) · Share price: $5.40 × 17: $91.80 (−8.2%) · Total return: price change + dividend: −7.2% ← Read the rows in order and the story is obvious: the company did exactly what you wanted, and the market simply decided it was worth less per dollar of earnings than it was last year. That is why “the earnings beat and the stock fell” is a normal sentence rather than a scandal — and why the multiple you pay is part of the decision, not a detail of it. The easiest way to lose money in a good company is to buy it after a long run in the multiple. If most of a stock’s recent return came from the multiple rising rather than from earnings, you are relying on the crowd’s opinion to keep improving — and an opinion has no floor.

Sources

• Stocks — the basicsSEC Investor.gov
• Trading and Exchanges: Market Microstructure for PractitionersLarry Harris, Oxford University Press (2003)
• Equity offerings and the primary marketNYSE Listing Standards / SEC EDGAR prospectuses