What is Stock exchange?
Birja
In short
A regulated marketplace where stocks are bought and sold. The largest in the US are the NYSE and Nasdaq.
Also known as: NYSE, Nasdaq, birja
An exchange is a regulated marketplace where stocks are bought and sold. It matches buyers' and sellers' orders under set rules, publishes prices to everyone and supervises fair trading. The largest US exchanges are the NYSE (New York Stock Exchange) and Nasdaq.
How an exchange works
For every stock the exchange keeps an order book: who wants to buy (bid) and sell (ask) how many shares at which price. When a new order arrives, the system automatically matches it against the best offer on the other side — that trade price becomes the last price on the chart.
You do not connect to the exchange directly: your broker sends the order. In the US the same stock trades on dozens of venues at once, and by law a broker should not execute your order worse than the best overall price (known as the NBBO — national best bid and offer).
Why it matters to a trader
- Listing standards. To list, a company must file reports and meet minimum requirements. If it stops meeting them, the stock can be delisted.
- Trading hours. The exchange's regular session runs 09:30–16:00 New York time, with pre-market before and after-hours after.
- Transparency. Exchange prices and volume are published openly — technical analysis relies on this data.
Stocks traded over the counter (OTC), outside an exchange, face much looser requirements and less disclosure — riskier for a beginner.
Example
A fictional stock trades on two venues at once:
- NYSE: bid $49.98 — ask $50.02
- Nasdaq: bid $49.99 — ask $50.01
The best overall price (NBBO): highest bid $49.99, lowest ask $50.01.
You send a market buy for 10 shares. The broker fills it at the best ask: 10 × $50.01 = $500.10. Had the order gone only to the NYSE and filled at $50.02, you would have paid $500.20. The difference is small, but across thousands of trades it adds up — which is why the price-protection rule matters.
Mistakes and tips
Check where a stock is listed: companies on the NYSE or Nasdaq face stricter reporting requirements than OTC names.
Exchanges close on holidays and close early on some days — check the calendar before planning an important trade.
An exchange and a broker are different things: the exchange is the marketplace, the broker is the intermediary that takes you there.
Frequently asked questions
- Is there a difference between the NYSE and Nasdaq for an investor?
- For an ordinary investor, hardly any: you buy through a broker the same way on both. The differences are mainly listing rules, history and which companies are listed where.
- Can I trade on a US exchange from Uzbekistan?
- Not directly — through a licensed broker that gives access to US exchanges. Check the broker's regulator and funding methods beforehand.
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