The stock market is where buyers and sellers come together to trade shares of publicly listed companies. Understanding how it operates helps you become a more informed investor and trader.
Stock Market Overview
What It Is
The Stock Market:
- Network of exchanges
- Where stocks are bought and sold
- Price discovery mechanism
- Regulated marketplace
Primary vs Secondary Market
Primary Market:
- Companies issue new shares
- IPOs (Initial Public Offerings)
- Money goes to company
- First-time sales
Secondary Market:
- Investors trade existing shares
- What most people mean by "stock market"
- Money exchanges between investors
- Daily trading activity
Stock Exchanges
Major US Exchanges
New York Stock Exchange (NYSE):
- World's largest by market cap
- Located on Wall Street
- Traditional auction system
- Over 2,800 listed companies
NASDAQ:
- Second largest US exchange
- Fully electronic
- Technology-focused
- Over 3,300 listed companies
Global Exchanges
Other Major Markets:
- London Stock Exchange (LSE)
- Tokyo Stock Exchange
- Hong Kong Stock Exchange
- Shanghai Stock Exchange
- Euronext (Europe)
Exchange Functions
Primary Roles:
- Match buyers with sellers
- Provide transparent pricing
- Ensure fair trading
- Set listing standards
- Regulate member firms
Market Participants
Individual Investors
Retail Traders:
- Individual people
- Trade through brokers
- Various goals and timeframes
- Growing market presence
Institutional Investors
Large Organizations:
- Mutual funds
- Pension funds
- Insurance companies
- Hedge funds
Characteristics:
- Manage large sums
- Significant market impact
- Professional management
- Diverse strategies
Market Makers
Function:
- Provide liquidity
- Always ready to buy/sell
- Profit from bid-ask spread
- Essential for smooth trading
Brokers
Role:
- Facilitate trades
- Connect investors to exchanges
- Execute orders
- May provide advice
How Trading Works
The Order Process
Steps:
- Investor decides to buy/sell
- Places order through broker
- Order sent to exchange
- Matched with opposite order
- Trade executed
- Settlement occurs
Order Types
Market Order:
- Execute immediately
- At best available price
- Guaranteed execution
- Price not guaranteed
Limit Order:
- Specify maximum/minimum price
- May not execute
- Price control
- No execution guarantee
Stop Order:
- Triggers at specified price
- Becomes market order
- Used for protection
- Or entry triggers
Bid and Ask
Bid Price: Highest price buyer will pay
Ask Price: Lowest price seller will accept
Spread: Difference between bid and ask
Price Discovery
How Prices Form:
- Continuous matching of orders
- Supply and demand balance
- Information incorporation
- Real-time adjustments
Trading Hours
Regular Hours (US)
NYSE and NASDAQ:
- 9:30 AM - 4:00 PM Eastern
- Monday through Friday
- Closed weekends
- Closed holidays
Extended Hours
Pre-Market:
- 4:00 AM - 9:30 AM
- Lower liquidity
- Higher volatility
After-Hours:
- 4:00 PM - 8:00 PM
- Also lower liquidity
- Reacts to news
Stock Indices
What They Are
Market Indicators:
- Track groups of stocks
- Measure market performance
- Benchmark for comparison
Major US Indices
Dow Jones Industrial Average:
- 30 large companies
- Price-weighted
- Oldest major index
S&P 500:
- 500 large companies
- Market-cap weighted
- Most followed benchmark
NASDAQ Composite:
- All NASDAQ stocks
- Technology-heavy
- Growth-oriented
How Indices Work
Calculation:
- Weighted average of component stocks
- Different weighting methods
- Adjusted for splits and changes
- Published continuously
Regulation
Regulatory Bodies
SEC (Securities and Exchange Commission):
- Primary US regulator
- Protects investors
- Maintains fair markets
- Enforces securities laws
FINRA (Financial Industry Regulatory Authority):
- Self-regulatory organization
- Oversees brokers
- Writes and enforces rules
Why Regulation Matters
Purposes:
- Prevent fraud
- Ensure transparency
- Maintain confidence
- Protect investors
Market Mechanics
Clearing and Settlement
After Trade Execution:
- Clearing confirms details
- Settlement transfers ownership
- T+2 settlement (2 business days)
- Ensures completion
Stock Splits
What Happens:
- Company divides shares
- More shares, lower price
- Same total value
- Often signals confidence
Example: 2-for-1 split: 100 shares at $100 become 200 shares at $50
Dividends
Cash Payments:
- Company distributes profits
- Per-share amount
- Usually quarterly
- Important dates to know
Market Conditions
Bull Market
Characteristics:
- Rising prices
- Optimistic sentiment
- Economic growth
- Increased buying
Bear Market
Characteristics:
- Falling prices (20%+ decline)
- Pessimistic sentiment
- Economic concerns
- Increased selling
Volatility
Price Fluctuations:
- Measured by VIX
- Higher = more uncertainty
- Affects trading decisions
- Normal part of markets
Key Takeaways
- Stock market connects buyers and sellers through exchanges
- NYSE and NASDAQ are the main US exchanges
- Multiple participant types create market activity
- Orders flow through brokers to exchanges
- Prices discovered through supply and demand
- Regular hours are 9:30 AM - 4:00 PM Eastern
- Indices track overall market performance
- Regulation ensures fair and transparent markets
What's Next?
Learn about opening a brokerage account to start investing in stocks.
This article is for educational purposes only and does not constitute financial advice.
Risk warning. This is education only, not financial, investment, tax or legal advice, and not a recommendation to buy or sell anything. Trading forex, CFDs, stocks, commodities, futures, options and crypto is high-risk; with leverage you can lose more than you deposit, and most retail traders lose money. Before you trade or invest in any form, check the local laws where you are and the rules of your country of residence, and consider your own financial situation; if in doubt, ask a licensed adviser. Past and tested results, and all examples, are for illustration only and do not guarantee future results.