Lesson 6: Introduction to Indexes

What Are Market Indexes?

A market index is a hypothetical portfolio of securities that represents a specific segment of the stock market. Think of it as a “basket” of stocks that measures the performance of a particular market segment.

Why Indexes Matter

1. Market Barometers
Indexes give you a quick snapshot of how “the market” or specific sectors are performing.

2. Performance Benchmarks
Investors and fund managers compare their returns to relevant indexes to see if they’re outperforming the market.

3. Economic Indicators
Index movements can reflect investor sentiment and economic outlook.

Major U.S. Stock Indexes

S&P 500

• What it is: 500 of the largest U.S. companies
• Coverage: About 80% of total U.S. stock market value
• Significance: Considered the best representation of the U.S. stock market
• Companies: Apple, Microsoft, Amazon, Johnson & Johnson, etc.

Dow Jones Industrial Average (DJIA)

• What it is: 30 large, “blue-chip” U.S. companies
• Unique Feature: Price-weighted (higher-priced stocks have more influence)
• Significance: One of the oldest and most frequently cited indexes
• Companies: Boeing, Goldman Sachs, McDonald’s, Visa, etc.

NASDAQ Composite

• What it is: All stocks listed on the NASDAQ exchange
• Focus: Heavy weighting in technology companies
• Significance: Good indicator of tech sector performance
• Companies: Most tech giants like Apple, Google, Facebook, Amazon

How Indexes Are Calculated

1. Price-Weighted (DJIA)
Stocks with higher prices have more influence. If a $150 stock moves 1%, it affects the index more than a $50 stock moving 1%.

2. Market-Cap Weighted (S&P 500, NASDAQ)
Companies with larger market capitalizations have more influence. More representative of the actual market.

Market Capitalization Formula: Stock Price × Number of Shares Outstanding

Index Funds and ETFs

One of the most important developments for individual investors is the ability to easily invest in entire indexes.

Index Funds
Mutual funds that aim to replicate the performance of a specific index.

ETFs (Exchange-Traded Funds)
Like index funds but trade like stocks throughout the day.

Benefits of Index Investing:

• Diversification: Instant diversification across many companies
• Low Costs: Much lower fees than actively managed funds
• Simplicity: Easy to understand and manage
• Consistent Performance: Most active managers fail to beat their benchmarks over time

International Indexes

• FTSE 100: Top 100 companies in the UK
• Nikkei 225: Major Japanese companies
• DAX: German blue-chip stocks
• Shanghai Composite: Chinese stocks

Practical Exercise

Track the S&P 500 and Dow Jones for one week. Note whether they moved up or down each day and try to identify what news or economic reports might have influenced the movements.