The US stock market explained: how it works, trading hours and pre-market for UAE investors
For most of the year, the trading day in New York starts at 5:30pm in Dubai. If you invest in US shares from the UAE, the market opens as you head home from work and closes around midnight. It is regulated in the US and trades in US dollars, the currency the dirham is pegged to.
It is also the largest stock market in the world, and the companies that make your phone and the apps on it are probably listed there. It is worth knowing how it works before you put money into it.
Below we explain how the market works and who regulates it, when it trades in UAE time and what happens before the open. The last sections cover how to buy your first US share from the UAE and which costs to check.
What the US stock market is
"The US stock market" is shorthand for the exchanges and other trading venues where shares in US-listed companies are bought and sold.
Two exchanges dominate it, the New York Stock Exchange (NYSE) and Nasdaq.
In 2025 US equity markets were worth $68.9 trillion, or 43.7% of the value of all listed shares worldwide, according to SIFMA's 2026 Capital Markets Fact Book. That made the US 4.4 times larger than China, the next-largest market.
NYSE and Nasdaq
The NYSE traces its history to 1792 and still has a trading floor on Wall Street. Each listed stock has a designated market maker, a firm whose job is to help keep trading in that stock orderly, especially at the open and close. Many long-established companies in banking, energy and industry are listed there.
Nasdaq opened in 1971 as the first electronic stock market and has no trading floor. Buyers and sellers are matched by computer. It is home to a large share of US technology companies, though plenty of other businesses list there too.
As an investor, you may notice little practical difference between the exchanges when investing through a platform. Your platform routes your orders for execution, and the price you pay depends on prevailing market conditions, available liquidity and execution arrangements. Shares listed on one exchange may also trade on other venues.
How share prices are set
A share price is the last price at which a buyer and a seller agreed to trade. At any moment there is a highest price someone is willing to pay (the bid) and a lowest price someone is willing to sell at (the ask). The gap between them is called the spread. When more people want to buy than sell, prices rise until enough sellers appear, and the reverse happens when sellers outnumber buyers.
Buyers and sellers change their minds for many reasons. Company results, news about a product or a new chief executive, interest rates and the wider economy can all shift a price, and so can the general mood of the market. Prices can move a lot in a short time, sometimes for reasons that have little to do with the company itself.
Market capitalisation
Market capitalisation, or market cap, is the total value of a company's shares. You work it out by multiplying the share price by the number of shares in issue. A company with 1 billion shares trading at $50 has a market cap of $50 billion (illustrative example).
The share price on its own tells you nothing about a company's size. A company with a $500 share price can be smaller than one whose shares trade at $50, if it has far fewer shares. Market cap is also how most indices decide how much weight each company gets.
When you buy a US share, the trade settles one business day later. This is known as T+1, and it has been the standard since 28 May 2024 (SEC).
The main indices: S&P 500, Nasdaq 100, Dow Jones
An index tracks a group of shares so you can see how part of the market is doing in one number. When people say "the US market was up today", they usually mean one of these three.
Index | What it measures | How it is weighted |
S&P 500 | About 500 leading US companies, covering roughly 80% of the value of the US market. It had 503 constituents on 31 March 2026, because some companies have more than one class of share. | By market cap, so the largest companies have the most influence |
Nasdaq-100 | 100 of the largest non-financial companies listed on Nasdaq, US and international | By market cap, with limits on the weight of any single company |
Dow Jones Industrial Average | 30 large, well-known US companies | By share price, so a $400 share moves the index more than a $100 share, whatever the size of the company |
Sources: S&P Dow Jones Indices, S&P 500 factsheet, 31 March 2026; Nasdaq Global Indexes; S&P Dow Jones Indices, Dow Jones Industrial Average.
The S&P 500 is the measure most professionals use for the US market as a whole. The Nasdaq-100 leans heavily towards technology, so it tends to rise and fall more sharply. The Dow is the oldest of the three and the one most often quoted in news headlines, but with only 30 companies it is a narrow view.
Sectors that make up the US market
Companies are grouped into 11 sectors under the Global Industry Classification Standard (GICS), which S&P Dow Jones Indices and MSCI created:
information technology (software, chipmakers, hardware)
communication services (telecoms, media, search and social platforms)
consumer discretionary (cars, retail, travel, restaurants)
consumer staples (food, drink, household goods)
healthcare (drugmakers, medical devices, insurers)
financials (banks, insurers, payment companies)
industrials (airlines, machinery, defence, logistics)
energy (oil and gas producers and services)
utilities (electricity, water and gas suppliers)
real estate (property companies and REITs)
materials (chemicals, mining, packaging)
Some sectors are much bigger than others. On 31 March 2026 the ten largest constituents of the S&P 500 made up 36.5% of the index, and seven of them were technology or communication services businesses (S&P Dow Jones Indices).
Keep this in mind when you build a portfolio. If most of your money sits in one sector, a bad year for that industry hits everything you own at once. Spreading across several sectors means one industry's problems do less damage, though it can't remove the risk of losses.
Who regulates it: SEC, FINRA and, in the UAE, the DFSA
The US Securities and Exchange Commission (SEC) is the federal regulator of the US securities markets. Its mission is to protect investors, keep markets fair, orderly and efficient, and help companies raise capital (Investor.gov). The SEC requires listed companies to publish regular financial reports, including an annual report (Form 10-K) and quarterly reports (Form 10-Q). Anyone can read them free on the SEC's EDGAR database.
The Financial Industry Regulatory Authority (FINRA) is a self-regulatory organisation for the US brokerage industry (Investor.gov). It writes and enforces rules for US broker-dealers. The exchanges also set their own listing rules that companies must meet.
When you invest from the UAE, the firm you deal with is regulated where it is based. For firms in the Dubai International Financial Centre (DIFC), that is the Dubai Financial Services Authority (DFSA). Firms elsewhere in the UAE answer to other regulators, such as the Securities and Commodities Authority or, in Abu Dhabi Global Market, the Financial Services Regulatory Authority. Before you open an account, check the firm on its regulator's public register. You can search DFSA-authorised firms on the DFSA public register.
CUSP Wealth is regulated by the DFSA and based in the DIFC. More about us is on our about us page.
US market hours in UAE time
The regular US trading session runs from 9:30am to 4pm New York time, Monday to Friday (Nasdaq). The UAE stays on Gulf Standard Time all year, while the US moves its clocks forward in March and back in November. So the opening time in the UAE shifts by an hour twice a year.
Period | Opens (UAE time) | Closes (UAE time) |
Second Sunday in March to first Sunday in November | 5:30pm | Midnight |
First Sunday in November to second Sunday in March | 6:30pm | 1am |
In 2026, US clocks go back on Sunday 1 November, so from Monday 2 November the market opens at 6:30pm UAE time. It returns to 5:30pm from Monday 15 March 2027, after the US clocks change on 14 March (Time Out). The market is shut on weekends and on US public holidays, and closes early on a few days a year. But, not all US public holidays result in a stock market closure.
For the full timetable, including half days, see our guide to US market hours in UAE time and our list of US stock market holidays.
Pre-market and after-hours trading: what they are and the risks
Trading doesn't stop completely outside the regular session. Pre-market trading runs before the open and after-hours trading runs after the close. Together they are known as extended-hours trading.
Session | New York time | UAE time, March to November | UAE time, November to March |
Pre-market | 4am – 9:30am | 12pm – 5:30pm | 1pm – 6:30pm |
Regular session | 9:30am – 4pm | 5:30pm – midnight | 6:30pm – 1am |
After-hours | 4pm – 8pm | Midnight – 4am | 1am – 5am |
Source: Nasdaq; NYSE Arca extended-hours FAQ.
For UAE investors, the pre-market session falls in the middle of the working day. It is when prices first react to news that broke overnight, and to company results released before the US open.
Extended-hours trading carries more risk than the regular session. FINRA lists these:
Liquidity is lower. Fewer people are trading, so your order may be filled only in part, or not at all, and the price may be worse than during the day.
Volatility is higher. With fewer trades, prices can swing further and faster, especially after news.
Spreads are often wider. The gap between buying and selling prices tends to be larger, which makes each trade more expensive.
Prices may not hold. A price reached before the open may not be where the share trades once the regular session starts.
Order types are limited. Brokers often accept only limit orders, which set the highest price you'll pay or the lowest you'll accept.
The trading day is about to get longer. The SEC has conditionally approved 23-hour trading, five days a week, on several venues including Nasdaq and NYSE Arca. An overnight session from 9pm to 4am New York time (6am to 1pm UAE time in winter) is expected to start on 6 December 2026, provided the systems that publish market prices are ready (WilmerHale, 29 September 2026). The same risks apply overnight, and trading is likely to be thinner still.
Not every platform offers every session.
Earnings season and why prices move around results
US-listed companies publish their results every quarter. Most companies' quarters end in March, June, September and December, so most reports land in the few weeks that follow. This busy stretch is called earnings season. The third-quarter season for 2026 began in the week of 12 October, led by the large US banks (Forbes, 4 October 2026).
Share prices often move sharply around results because the market compares them with what analysts expected. A company can report higher profits and still see its shares fall if the numbers, or its outlook for the next quarter, fall short of those forecasts. A miss can also be followed by a rise if investors had feared something worse.
Many companies release results just before the open or just after the close. That means the first big price move often happens in pre-market or after-hours trading, which in the UAE is during the afternoon or in the early hours of the morning.
In May 2026 the SEC proposed letting companies choose to report twice a year instead of every quarter. At the time of writing it is still a proposal (SEC).
If you hold shares in a company, note when it reports. The first move after results can reverse within days, so read the results and the company's outlook before deciding whether anything has changed for you.
How UAE residents can buy US stocks
UAE residents can invest in US stocks through a regulated investment platform. The steps usually look like this.
1. Choose a regulated platform. Check the firm on its regulator's public register before you sign up.
2. Open an account and verify your identity. Know-your-customer (KYC) checks usually ask for your Emirates ID or passport and proof of address. You will also answer questions about your investing experience, goals and finances, so the platform can check its services are suitable for you.
3. Complete a W-8BEN form. This US tax form confirms you are not a US person for tax purposes. Without it, the payer may withhold tax at 30% (IRS instructions for Form W-8BEN). A signed form generally stays valid until the end of the third calendar year after the year you sign it. The US has no income tax treaty with the UAE (IRS), so a treaty rate on dividends is not available on the basis of UAE tax residence. For questions about your own situation, speak to a tax advisor.
4. Fund your account. US shares are priced in US dollars. The dirham is pegged at AED 3.6725 to the dollar, so the exchange rate itself barely moves, but conversion fees may still apply.
5. Choose what to buy and place your order. A market order buys at the best available price. A limit order lets you set the most you are willing to pay.
With fractional shares, you can buy part of a share instead of a whole one. If a company's shares cost $400, $50 buys you 0.125 of a share (illustrative example). This makes it easier to spread a modest amount across several companies and sectors.
Costs to check
Fees are taken every year you stay invested, and small ones add up. Before you start, check the platform's fee schedule for these charges:
trading fees, charged each time you buy or sell (CUSP charges $0.25 trading fees¹)
currency conversion, a fee or margin when your dirhams are converted into dollars and back
custody or account fees for holding your shares, often a yearly percentage or a monthly fee
the spread between buying and selling prices, which you pay even when there is no commission
bank transfer fees for moving money in and out
US tax on dividends, withheld before the money reaches you
Our charges are all listed on our fees schedule.
¹ Basic trading fees refer to standard buy and sell orders in US stocks. Custody, currency conversion (FX) and other fees may apply. See our fees schedule for details.
FAQ
How does the US stock market work?
What time does the US market open in the UAE?
What is pre-market trading?
Can UAE residents buy US stocks?
What is the difference between NYSE and Nasdaq?
Start investing in US stocks on CUSP
CUSP Wealth is regulated by the Dubai Financial Services Authority (DFSA) and based in the Dubai International Financial Centre (DIFC). Investors use the platform to build and manage their own portfolios of US stocks. With fractional shares you can invest a set amount and spread it across companies in different sectors. $0.25 trading fees apply,¹ and all our charges are listed on our fees schedule.
Start investing in US stocks with fractional shares
Capital at risk. The value of investments can fall as well as rise, and you may get back less than you invest. Extended-hours trading carries additional risks, including lower liquidity and higher volatility.
¹ Custody, currency conversion (FX) and other fees may apply. See our fees schedule.
Disclaimer: This article is published for educational and informational purposes only. It does not constitute financial, investment, tax or legal advice, and it is not a recommendation or endorsement of any particular financial product, fund or service. The value of investments can go down as well as up, and you may lose some or all of your capital. Past performance is not an indicator of future results. Readers should do their own research and consult a qualified financial adviser before making any investment decisions. Advisory calls are only available to clients who meet the suitability assessment required by Cusp Wealth. Not all financial products mentioned in this blog are products or services currently available from Cusp Wealth.
Any opinions, market commentary, research, analysis, prices, statistics, forecasts or other information referred to in this article are based on information available at the time of publication. Cusp Wealth Ltd takes reasonable care to ensure the information is accurate and drawn from sources believed to be reliable, but makes no representation or warranty as to its accuracy, completeness, reliability or continued applicability. Any third-party information used in this article is provided for information only. Cusp Wealth Ltd accepts no liability for any losses arising directly or indirectly from reliance on, or misuse of, the information in this article.
Cusp Wealth Ltd is regulated by the Dubai Financial Services Authority (DFSA) and is an entity in the Dubai International Financial Centre (DIFC). The firm holds a Category 4 licence (licence number 10863, reference number F011420) and is licensed to provide financial services to both professional and retail clients, including Shari'a-compliant products, in line with its DFSA licence and Islamic endorsement. Its services are available only to eligible clients in jurisdictions where the Firm is authorised or otherwise permitted to operate.
The information in this article is current as of October 2026 and is subject to change.
