Stock Markets Around the World

What a Stock Exchange Actually Is

When the evening news says "the market was up today," it is almost always referring to one single number — usually the S&P 500, sometimes the FTSE 100 or the Dow Jones — as if there were one global stock market. There isn't. There are dozens of separate stock exchanges around the world, each with its own listed companies, its own rules, its own trading hours, and its own flagship index. Understanding how they differ, and which one any given headline is actually talking about, changes how you read financial news for the rest of your life.

A stock exchange is a regulated marketplace that provides the infrastructure for buying and selling shares in listed companies: matching buyers with sellers, setting and publishing prices in real time, enforcing listing and conduct rules, and providing a level of transparency that makes it possible for a stranger on the other side of the world to trust that a trade will settle fairly. Without this infrastructure, buying shares in a company would resemble trying to sell a used car with no classified ads, no dealer network, no standard contract, and no way to verify the other party is genuine — every transaction would require individually negotiated trust.

Crucially, an exchange does not own the companies listed on it, any more than a shopping centre owns the shops inside it. It provides the venue, the rulebook, and the matching mechanism. A company that wants to list — through an IPO, an initial public offering — must satisfy the exchange's requirements around minimum size, financial reporting standards, corporate governance, and free float (the proportion of shares available to the public rather than held by insiders). Once listed, anyone with a brokerage account, anywhere in the world with access, can typically buy or sell those shares during the exchange's trading hours, through their broker.

A Brief History of Why Exchanges Exist

The world's first recognisable stock exchange is widely credited to Amsterdam, where the Dutch East India Company (VOC) began issuing tradeable shares to the public in 1602 to fund its enormously capital-intensive and risky trading voyages. Before this, financing a venture typically meant a small, fixed group of investors sharing the profit and risk of one specific voyage. The VOC's innovation — permanent, tradeable shares in an ongoing company, rather than a stake in a single voyage — meant investors could buy in or cash out without needing to wait for a ship to return, which required somewhere they could actually trade those shares with each other. The Amsterdam exchange grew directly out of that need.

The London Stock Exchange traces its origins to the coffee houses of 17th-century London, where stockbrokers who had been barred from the Royal Exchange for rowdy behaviour began meeting informally at Jonathan's Coffee House on Exchange Alley to trade shares — a system of handwritten prices and verbal deals that gradually formalised into a members-only exchange by 1801. The New York Stock Exchange traces its founding to the Buttonwood Agreement of 1792, when 24 New York stockbrokers, trading informally under a buttonwood tree on what is now Wall Street, signed an agreement establishing fixed commission rates and rules for trading securities among themselves — a deliberately exclusive arrangement intended to bring order and trust to what had previously been a chaotic, unregulated market in government bonds and bank shares.

The common thread across all three origin stories: exchanges emerged organically, from informal gatherings of people who needed a reliable, trusted place to trade, long before any government formally created or mandated them. Regulation and formal structure came later, layered on top of markets that already existed because the underlying need — a trustworthy place to buy and sell ownership stakes in companies — was so fundamental to raising capital at scale.

The Major Exchanges Today

A useful way to size these exchanges relative to each other: the NYSE and NASDAQ combined represent roughly 40-45% of the entire world's listed equity market value, despite the United States being home to only around 4% of the world's population. This concentration is a recurring theme throughout this chapter and has real consequences for anyone building a globally diversified portfolio, which is covered in more depth later on.

How a Company Actually Gets Listed

Going public is a deliberately demanding process, and understanding it explains why exchange listing is treated as a meaningful credibility signal in its own right, not just a formality. A private company wanting to list typically spends 12-18 months preparing: appointing investment banks to underwrite the offering, having its financial statements independently audited to the exchange's required standard, drafting a detailed prospectus disclosing its business, risks, and finances to potential investors, and satisfying minimum requirements around company size, profitability history (on some exchanges), and the proportion of shares that will be available to the public (the "free float").

Exchanges compete with each other for these listings, because listing fees and ongoing trading volume are a meaningful part of an exchange's own revenue — which is part of why NASDAQ actively courted technology companies in the late 20th century with lower listing requirements and faster, fully electronic trading, successfully positioning itself as the natural home for growth-stage tech businesses, a reputation that persists today. A company is generally free to choose which exchange (and in some cases, which country) to list on, and some large companies maintain listings on more than one exchange simultaneously — a "dual listing" — to access a broader pool of investors across different time zones and regulatory jurisdictions.

Once listed, companies take on ongoing obligations: regular financial reporting (quarterly in the US, typically half-yearly in the UK, though many UK companies also report quarterly on a voluntary basis), disclosure of material events that could affect the share price, and continued compliance with minimum listing standards. Persistent failure to meet these — for example, a share price falling below a minimum threshold for an extended period, or failing to file required financial reports — can result in a company being delisted, moved to a less regulated over-the-counter market, discussed later in this chapter.

IPOs, Direct Listings, and SPACs — Different Routes to the Same Destination

The traditional IPO described above isn't the only way a company becomes publicly tradeable, and the differences between the main routes matter for understanding why a newly listed company's first day of trading sometimes behaves unpredictably.

In a traditional IPO, investment banks act as underwriters: they help set an initial offer price, commit to buying any shares that aren't fully subscribed by investors, and typically allocate a meaningful portion of the offering to large institutional investors before the shares ever become available to ordinary retail investors on the first day of trading. This underwriting role is also why IPO share prices are sometimes criticised as being set conservatively low — a lower offer price makes the underwriters' job of selling the full allocation easier, and a strong "pop" in price on the first trading day is good publicity for the bank, even though it technically means the company raised less money than it could have.

A direct listing skips the underwriting process and the new-share issuance entirely — existing shareholders (employees, early investors, founders) simply begin selling their existing shares directly on the exchange, with no new capital raised and no bank-set offer price. This route has become more common among well-capitalised technology companies that don't need to raise fresh cash through the listing itself, and simply want an orderly way for existing shareholders to begin trading their stakes.

A SPAC (special purpose acquisition company) is a different structure entirely: a shell company with no actual operating business, which lists on an exchange first, raises cash from investors, and then has a defined window (commonly two years) to find and merge with a real private company — effectively taking that private company public through the back door, without it going through a traditional IPO process at all. SPACs saw a dramatic surge in popularity in 2020-2021, followed by a sharp decline once a large share of SPAC mergers underperformed expectations, which is a useful reminder that the route a company takes to becoming publicly listed doesn't by itself say anything about the quality of the underlying business.

What an Index Actually Measures

An index is a defined, rules-based list of selected companies, combined mathematically into a single number that tracks their collective performance over time. When the news reports "the FTSE 100 rose 0.4% today," it means the combined, weighted market value of the 100 largest companies listed on the London Stock Exchange rose by that amount — it says nothing directly about any individual company, and nothing at all about companies not included in that specific index.

How Indices Are Weighted — and Why It Changes Everything

The single most important, least widely understood fact about stock indices is that not all of them are built the same way, and the weighting method dramatically changes what the index actually represents. Three main methodologies exist, and mixing them up leads to genuine misunderstandings about what "the market" is doing.

Market-capitalisation weighting is the most common method, used by the S&P 500, FTSE 100, NASDAQ 100, and most major global indices. Each company's influence on the index is proportional to its total market value (share price multiplied by number of shares outstanding). A company worth $3 trillion moves the index far more than a company worth $10 billion, even if the smaller company's share price rises by a much larger percentage on a given day. This means market-cap weighted indices are, by construction, concentrated in whichever handful of companies happen to be largest at any given time — a structural feature, not a flaw, but one that surprises people who assume an index with "500" companies in its name must be evenly spreading risk across 500 roughly equal businesses.

Price weighting, used by the Dow Jones Industrial Average and the Nikkei 225, gives each company influence proportional to its raw share price, regardless of the company's total size. A company with a $900 share price moves a price-weighted index nine times more than a company with a $100 share price, even if the $100 company is a vastly larger business overall by total market value. This is widely regarded by professional investors as a methodological relic — the Dow is weighted this way largely because it was created in 1896, before market-cap weighting became the accepted standard, and changing it now would break decades of historical comparability.

Equal weighting, used by some specialist index variants (an "S&P 500 Equal Weight" index exists alongside the standard market-cap version), gives every constituent company the same influence regardless of size. This produces a meaningfully different result over time — in periods when a small number of mega-cap companies drive most of the market's gains, a standard market-cap weighted index captures that concentration fully, while an equal-weighted version of the same 500 companies would show a more modest return, because it isn't overweighted toward whichever handful of giants happened to be doing best.

A Worked Example: How Much One Company Can Move an Index

The weighting explanation above is easier to absorb with real numbers attached. Suppose a simplified version of a market-cap weighted index contains just five companies, with the market values and index weights shown below.

Notice what this means in practice: a 10% rise in the largest company alone moves this simplified index almost exactly as much as a 10% rise across all four of the other companies combined. This is not a hypothetical exaggeration — it is a reasonably faithful simplification of how concentrated the real S&P 500 and NASDAQ 100 have become at various points, where the ten largest constituent companies, out of 500 or 100 respectively, have at times represented well over a third of the entire index's total value. An investor who believes they hold "500 different companies, evenly spread" when they buy an S&P 500 tracker fund is, in that specific sense, mistaken — they hold 500 companies, but the outcome of their investment is disproportionately tied to the fortunes of a small handful of the very largest ones.

How to Actually Read an Index Headline

Financial news reports index levels in two different units, and conflating them is a common source of confusion. Index points are the raw number itself — "the S&P 500 closed at 5,800" — which is an abstract figure with no inherent real-world meaning on its own; it only matters relative to where the index was before. Percentage change — "the S&P 500 rose 0.6% today" — is almost always the more useful figure, because it's comparable across time regardless of the index's starting level, and comparable across different indices with completely different point scales (a 0.6% move means the same thing whether the index is at 5,800 or 58).

A second common source of confusion is "record high" headlines. An index reaching a nominal record high — simply the highest point number it has ever reached — says nothing on its own about inflation-adjusted, or "real," performance. An index that reached 5,000 points in 2015 and reaches 6,500 points a decade later has risen 30% in nominal terms, but if cumulative inflation over that decade was also around 30%, the real, purchasing-power-adjusted gain is close to zero — the index "hitting a new record" in nominal terms can coexist with investors having made essentially no real progress at all. This distinction matters most during and after periods of unusually high inflation, and is worth keeping in mind whenever a headline emphasises a nominal record without mentioning the inflation-adjusted picture.

How UK Investors Actually Access Foreign Exchanges

Most mainstream UK brokers give retail investors reasonably straightforward access to UK shares (LSE) and US shares (NYSE and NASDAQ) within the same account, usually with an automatic currency conversion handled behind the scenes when you buy or sell US shares in pounds. Access to other major exchanges — European, Japanese, Australian — is available through many platforms but sometimes requires a specific international trading service, additional account setup, or carries higher dealing fees than domestic trades.

For exchanges that are harder to access directly — mainland China's Shanghai and Shenzhen exchanges being the clearest example, where foreign retail access is heavily restricted — investors typically gain exposure indirectly through ADRs (American Depositary Receipts) or GDRs (Global Depositary Receipts). These are certificates issued by a bank, traded on a familiar exchange (often the NYSE for ADRs), that represent ownership of shares held in trust on the company's home exchange. An ADR lets a US or UK investor buy and sell a foreign company (say, a Hong Kong or Indian company) through a familiar US-listed security, in US dollars, without needing a brokerage account in that company's home country — the depositary bank handles the underlying foreign share custody and currency conversion.

By far the simplest route for most ordinary investors seeking genuine global diversification is a global index fund or ETF that already holds shares across dozens of exchanges and countries within a single fund — sidestepping the need to personally open accounts, navigate currency conversions, or understand depositary receipt structures for every individual market, which is covered in detail in this Learn section's chapter on index funds.

Emerging Market Exchanges — Extra Considerations

Exchanges in developing economies — India's NSE and BSE, Brazil's B3, South Africa's JSE, and the mainland Chinese exchanges mentioned above — carry a distinct set of characteristics worth understanding before investing in them, directly or through a fund.

Liquidity is typically lower than in developed markets, meaning the gap between buy and sell prices (the spread) tends to be wider, and large trades can move the price more than an equivalent trade would on the NYSE or LSE. Currency risk is more pronounced, as emerging market currencies have historically been more volatile against major currencies like the dollar, pound, or euro than developed-market currencies are against each other. Regulatory and political risk is generally higher — rules around foreign ownership, capital controls limiting how easily money can be moved in and out of the country, and corporate governance standards vary considerably and can change with less warning than in more established markets.

China specifically operates a partial-access system called Stock Connect, a set of trading links between the Hong Kong exchange and the Shanghai and Shenzhen exchanges that allows foreign investors limited, quota-based access to a defined list of mainland Chinese shares (known as "A-shares") through Hong Kong brokers, without needing a mainland Chinese trading account directly. It's a notable example of how access to major world markets isn't simply "open" or "closed" but often sits somewhere in between, governed by specific bilateral arrangements that have evolved gradually over time.

OTC Markets — Trading Outside the Main Exchanges

Not every publicly tradeable company meets the listing requirements of a major exchange like the NYSE or LSE. Smaller, often newer or more speculative companies can instead trade on over-the-counter (OTC) markets — networks where securities are traded directly between dealers, without the centralised order-matching infrastructure, listing standards, and reporting requirements of a formal exchange.

OTC markets serve a genuine purpose — they give very small or early-stage companies, and companies that have been delisted from a major exchange, a way to remain tradeable rather than becoming completely illiquid. But they come with meaningfully less regulation, less mandatory financial disclosure, lower liquidity, and historically have been a venue where fraudulent or extremely speculative "penny stocks" are disproportionately found, precisely because the barriers to being listed there are so much lower than on a major exchange. For the large majority of ordinary, long-term investors, OTC markets are not an area that needs active engagement, and heightened caution is warranted for anyone considering them.

Who Actually Regulates These Exchanges

Each major exchange operates under the oversight of a national (or, in the EU's case, partially supranational) financial regulator, which sets and enforces the rules around market conduct, disclosure, and investor protection. In the UK, this is the Financial Conduct Authority (FCA); in the US, the Securities and Exchange Commission (SEC); most other major economies have an equivalent body. These regulators approve listing rules, investigate market abuse such as insider trading, and can halt trading in a specific stock, or across an entire market, under defined circumstances.

Circuit breakers are a specific, important mechanism worth knowing: automatic, rules-based trading halts triggered when an index falls by a specified percentage within a trading session — designed to give the market a short, enforced pause for information to be absorbed and panic-driven selling to slow down, rather than allowing a rapid, self-reinforcing crash to run uninterrupted. The NYSE, for example, has tiered circuit breakers that pause trading market-wide for 15 minutes if the S&P 500 falls 7% in a single session, with longer or market-closing halts at larger declines. These mechanisms were introduced and refined specifically in response to past episodes of extreme single-day volatility, including the 1987 crash, and remain part of the regulatory infrastructure of every major exchange today.

Why Any of This Matters for an Ordinary Investor

If you invest in a global index fund and never think about individual exchanges again, most of the mechanics in this chapter will never directly affect a decision you make — and that's a reasonable, common outcome for long-term investors. But a basic understanding of how exchanges and indices work explains several things that otherwise seem confusing: why "the market" in financial news usually means one specific index rather than literally every company on earth; why a UK-focused fund and a US-focused fund can perform very differently over the same period, despite both being called "stock market" investments; and why a market-cap weighted global fund will always be concentrated in whichever country and companies currently happen to be largest — overwhelmingly the United States, at present — rather than spread evenly across the world's economies by population or GDP.

It also explains a subtler point: when a fund factsheet says it tracks "the FTSE All-World Index" or "the MSCI World Index," it is implicitly inheriting all of the weighting decisions, country inclusion rules, and rebalancing methodology that index provider uses — decisions made by a committee, following a published rulebook, not an arbitrary or random selection. Understanding that this process exists, and roughly how it works, is what separates "I own some funds" from genuinely understanding what you own and why it moves the way it does.