Stock exchanges explained: NYSE, Nasdaq and where your order goes

A stock exchange is a regulated marketplace where buy and sell orders for shares meet and become trades. When people say a company "trades on the NYSE" or "is listed on Nasdaq," they mean two different things at once: the company has met that exchange's listing rules, and the exchange is one of the places its shares change hands.

In the United States, though, the exchange that lists a stock is rarely the only place it trades. A modern US share can be bought on any of a dozen-plus stock exchanges, inside a broker-run private venue, or from a wholesale market maker that fills the order out of its own inventory. This guide explains what each of those venues is, how they are tied together into one national market, what it takes for a company to list, and what actually happens to your order after you tap "buy."

What a stock exchange does

An exchange has three jobs. It runs a matching engine that pairs buy and sell orders according to published rules, usually price first and then time. It publishes quotes and trades so everyone can see the current market. And it acts as a self-regulatory organization: under the Securities Exchange Act of 1934, a registered exchange must write and enforce rules for its members, and the SEC must approve those rules.

That registration is what makes a venue a "national securities exchange." The SEC's list, last updated January 7, 2026, names 29 of them registered under Section 6(a) of the Exchange Act. The number sounds large because each company runs several licenses, each with its own pricing model or market niche:

A few practical points follow from the table. The "NYSE floor" you see on television is one venue among many; most of its volume, like everyone's, is electronic. Exchanges compete on fees, speed and order types, so the same stock can trade on many of them within the same second. And a new exchange can still enter: 24X National Exchange and the Texas Stock Exchange are both recent additions to the list.

Listing: how a company gets onto an exchange

To be listed, a company applies to one exchange and agrees to its rules. Listing gives the company a primary market for its opening and closing auctions, a public ticker, and visibility with investors. In return it must meet initial listing standards and keep meeting continued listing standards.

The standards differ by exchange and by tier (Nasdaq has the Global Select, Global and Capital Market tiers; the NYSE has its main board and NYSE American for smaller firms), but they test the same things:

• Size: minimum market value of publicly held shares, earnings, revenue or assets.
• Price: a minimum share price at listing, typically a few dollars.
• Distribution: a minimum number of shareholders and publicly held shares, so there is a real market.
• Governance: an independent board majority, an audit committee, and timely SEC filings.

Continued listing is where investors most often meet these rules. Both major exchanges treat a sustained sub-$1 price as a deficiency: on Nasdaq a bid price below $1.00 for 30 consecutive business days triggers a notice, and on the NYSE an average closing price below $1.00 over 30 consecutive trading days does the same. The company then gets a cure period, often used for a reverse split. If it fails, the stock is delisted and usually moves to the over-the-counter market, where spreads are wider and information is thinner.

Where trades actually happen

US market structure has three main kinds of venue.

Exchanges (the "lit" market)

Exchanges display their best prices publicly, which is why they are called lit markets. Anyone can see the highest bid and lowest offer on each exchange, and those quotes feed the national best bid and offer. Exchanges also run the opening and closing auctions on the listing market, which set the official open and close prices that funds and indexes use.

Alternative trading systems and dark pools

An ATS is a trading venue that matches buyers and sellers but is regulated as a broker-dealer rather than as an exchange. ATSs file Form ATS-N with the SEC and report their volume to FINRA, which publishes it weekly. Many are dark pools: they do not display quotes before a trade. Institutions use them to buy or sell large blocks without showing their hand, because a visible order for 2 million shares would move the price before it could be filled. The trade-off is less pre-trade transparency for everyone else.

Wholesalers and internalization

Most US online brokers send customers' marketable stock orders to a wholesaler, a large market-making firm that fills the order itself, buying from or selling to the customer out of its own inventory. This is called internalization. Wholesalers often fill at a price slightly better than the NBBO (price improvement) and many pay brokers for the order flow (payment for order flow), which is one reason commission-free trading exists. The practice is legal in the US but debated; brokers must disclose their routing and payments in quarterly Rule 606 reports, and market centers publish execution quality under Rule 605.

How it all stays one market

If a stock trades in dozens of places, how do you know you got a fair price? Three pieces of SEC regulation, collectively Regulation NMS (adopted 2005), tie the venues together:

1. Consolidated quotes. Every exchange's best bid and offer is sent to the securities information processors (SIPs), which publish the NBBO.
2. Order protection. An exchange generally may not execute a trade at a price worse than a protected quote displayed on another exchange (a "trade-through").
3. Consolidated tape. Every trade, on or off exchange, must be reported promptly, so the last-sale price and volume you see reflect the whole market.

Brokers add a fourth layer: under FINRA rules they owe customers best execution, a duty to seek the most favorable terms reasonably available for each order, and they must review their routing regularly.

A real example: one order's path

Suppose you buy 10 shares of a large US company with a market order through a typical commission-free app during regular hours.

Large institutional orders take a different path: they are usually sliced by algorithms into many small pieces and spread across exchanges and dark pools over hours or days.

Common misconceptions

"The NYSE sets the price of NYSE stocks." It sets the official open and close through its auctions, but intraday prices come from trading across every venue.

"Dark pools are illegal or secret." They are registered, regulated venues. "Dark" refers only to the absence of displayed quotes before a trade. Their trades appear on the tape.

"Commission-free means free." Costs move into the spread you pay and the order-flow economics behind it. Comparing execution prices, not just commissions, is the real test.

"Over-the-counter means unregulated." OTC trading is overseen by FINRA and the SEC, but OTC-quoted companies often have far lighter disclosure duties than listed ones.

Exchange vs ATS vs wholesaler

How Finabase helps

Every symbol page shows a stock's live quote with the current best bid and ask and their sizes, the last trade, and the day's volume, so you can see the consolidated market for any listed company. The indices page lists the major US and global indexes alongside bonds, grouped by region, for a quick read on the whole market.

To understand what you are actually buying when you place that order, start with What is a stock? A complete beginner’s guide to shares.

Frequently asked questions

What is the difference between NYSE and Nasdaq?

Both are SEC-registered national securities exchanges that list companies and trade stocks. The NYSE combines electronic trading with designated market makers and its famous floor; Nasdaq has always been fully electronic. For an investor buying shares, the practical difference today is small, because a stock listed on either trades on every exchange.

How many stock exchanges are there in the US?

The SEC's list of registered national securities exchanges, last updated January 7, 2026, has 29 entries. Several of those trade only options, so the number that trade stocks is smaller, roughly a dozen and a half.

Are dark pools bad for retail investors?

Not inherently. They let institutions trade large blocks with less market impact, and their trades are reported publicly after the fact. Critics argue that moving volume off displayed markets weakens public price discovery, which is why regulators require ATS disclosures and volume reporting.

What happens to my shares if a stock is delisted?

You still own them. A delisted company's shares usually move to over-the-counter trading, where they can still be bought and sold, but often with wider spreads, less liquidity and less information.

Summary

A stock exchange matches orders, publishes prices and polices its members, and the SEC recognizes 29 of them as of 2026. Listing on an exchange means meeting its standards for size, price, ownership and governance, and keeping them up, or risking delisting. Trading, however, happens everywhere at once: across exchanges, inside dark pools and through wholesalers. Regulation NMS ties those venues together with a national best bid and offer, order protection and a single consolidated tape, so a quote and a trade mean the same thing wherever your order is filled.