Como funciona o mercado de ações dos EUA: um guia para iniciantes sobre NYSE e NASDAQ

If you’re starting your investment journey, understanding how the U.S. stock market operates — especially the NYSE and NASDAQ — is crucial.

These two exchanges are the heart of the global financial system, connecting companies, investors, and economies in a dynamic marketplace where fortunes are built (and sometimes lost).

In this article, you’ll learn how the U.S. stock market works, the differences between the NYSE and NASDAQ, and what every beginner investor needs to know before making their first trade.

What Is the Stock Market?

The stock market is a collection of markets where investors buy and sell shares (ownership) of publicly traded companies.

When you buy a stock, you’re purchasing a small piece of a company — and you become a shareholder.

✅ The stock market provides companies with capital to grow and gives investors opportunities to share in that growth.

What Are the NYSE and NASDAQ?

The U.S. has multiple stock exchanges, but the two most famous are:

1. New York Stock Exchange (NYSE)

  • Founded in 1792, making it the oldest and most prestigious U.S. exchange.
  • Located on Wall Street in New York City.
  • Home to major, established companies like:
    • Coca-Cola (KO)
    • Boeing (BA)
    • Walmart (WMT)
    • Disney (DIS)

✅ Known for blue-chip stocks, stability, and traditional industries.

2. NASDAQ

  • Launched in 1971 as the world’s first electronic stock market.
  • No physical trading floor — all transactions are digital.
  • Famous for hosting tech giants like:
    • Apple (AAPL)
    • Amazon (AMZN)
    • Microsoft (MSFT)
    • NVIDIA (NVDA)

✅ Known for technology, innovation, and fast-growing companies.

How Do Stock Exchanges Work?

Stock exchanges like NYSE and NASDAQ provide:

  • A marketplace where buyers and sellers meet
  • Transparency with real-time pricing
  • Regulation and oversight to protect investors

When you place a trade:

  1. Your broker routes the order to the appropriate exchange.
  2. A buyer and seller are matched based on price and availability.
  3. The trade is executed — often in less than a second!

✅ Thanks to technology, retail investors can now access these exchanges easily via online brokerages.

How Are Stock Prices Determined?

Stock prices are set by supply and demand:

  • If more people want to buy than sell, the price goes up.
  • If more people want to sell than buy, the price goes down.

Prices change constantly based on:

  • Company earnings reports
  • Economic news
  • Interest rates
  • Industry trends
  • Investor sentiment

✅ The stock market reflects both logic (financial performance) and emotion (fear, greed, optimism).

Major Stock Market Indices

Indices track the performance of groups of stocks — helping investors gauge overall market health.

Key U.S. indices:

  • S&P 500 — 500 largest U.S. companies
  • Dow Jones Industrial Average (DJIA) — 30 large industrial companies
  • NASDAQ Composite — Over 3,000 stocks, heavily weighted toward tech

✅ You can invest directly in these indices through ETFs like VOO (S&P 500) or QQQ (NASDAQ 100).

Trading Hours for NYSE and NASDAQ

SessionTime (Eastern Time)
Pre-Market4:00 AM – 9:30 AM
Regular Trading9:30 AM – 4:00 PM
After-Hours4:00 PM – 8:00 PM

✅ Most beginners trade during regular hours when liquidity and pricing are best.

How to Start Investing in the U.S. Stock Market

Step 1: Open a Brokerage Account

Choose trusted brokers like:

  • Fidelity
  • Charles Schwab
  • Robinhood
  • E*TRADE
  • SoFi Invest

✅ Look for platforms offering $0 commissions and access to U.S. markets.

Step 2: Fund Your Account

Transfer money securely from your bank.

Step 3: Choose Your Investments

Beginners often start with:

  • Broad-market ETFs (like VTI or VOO)
  • Individual stocks of well-known companies (like AAPL, MSFT)
  • Diversified mutual funds

Step 4: Place Your First Trade

Decide:

  • Buy or sell
  • Market order (buy immediately) or limit order (set your price)

✅ Confirm details carefully — mistakes are rare but possible!

Step 5: Monitor and Learn

Track your portfolio, but avoid overchecking it daily.
✅ Stay focused on your long-term strategy.

Important Tips for New Investors

  • Start with small amounts until you gain confidence
  • Focus on diversification rather than betting on single stocks
  • Ignore short-term market noise — think in years, not days
  • Reinvest dividends to maximize compounding
  • Keep learning — the best investors are lifelong students

Common Beginner Mistakes to Avoid

  • Trying to day-trade or time the market
  • Investing based on hype or tips
  • Neglecting diversification
  • Selling during market dips out of fear

✅ Building wealth through stocks is a marathon, not a sprint.

Final Thoughts: The NYSE and NASDAQ Are Gateways to Opportunity

The U.S. stock market, through the NYSE and NASDAQ, offers incredible opportunities for building wealth over time.

With patience, knowledge, and a disciplined approach, anyone can participate — no matter their starting point.

So open your account, invest wisely, and start your journey toward financial freedom — one share at a time.