Before exchanges existed
In the 17th century, buying shares in the Dutch East India Company meant finding another holder willing to sell, agreeing on a price face-to-face, and trusting each other to follow through. It was inefficient, costly, and fraud-prone. The Amsterdam Stock Exchange, founded in 1602, changed everything by creating a central location where buyers and sellers could meet under rules and oversight — the model that every modern exchange follows.
How a trade actually happens
When you place a "buy 10 shares" order through your broker, that order is routed to an exchange. A matching engine finds a sell order at your price and executes the trade in milliseconds. The exchange charges a tiny fee, guarantees settlement (you receive shares, the seller receives cash, within two business days), and publishes a public record of every trade price.
The world's major exchanges
| Exchange | Home | Market cap (approx.) |
|---|---|---|
| New York Stock Exchange | New York | ~$25 trillion |
| NASDAQ | New York | ~$21 trillion |
| Shanghai Stock Exchange | Shanghai | ~$7 trillion |
| Euronext | Amsterdam/Paris | ~$6 trillion |
| London Stock Exchange | London | ~$3 trillion |
Listing requirements: investor protection built in
To list on a major exchange, a company must meet strict requirements: minimum market capitalisation, governance standards, and ongoing disclosure obligations — quarterly earnings, major corporate events. This is why exchange-listed shares offer more investor protection than over-the-counter (OTC) securities, which trade directly between parties with far less oversight.
"A stock exchange is an information machine — every trade is a collective vote about what a company is worth right now."
What this means for you
When you buy shares through a broker, you benefit from centuries of infrastructure built to give you a fair price, immediate execution, and legal protection. The exchange guarantees you will receive your shares and the seller will receive cash — even if one party fails before settlement. That mundane guarantee is what makes investing at scale possible for ordinary people.