Stocks, ETFs & Index Funds
Open a brokerage account and you'll immediately face thousands of options. Most of them fall into one of three categories. Here's how to tell them apart.
Individual stocks
Buying a stock means buying a piece of one specific company. If you buy Apple stock, your return depends entirely on Apple. If Apple has a great decade, you do well. If Apple struggles, so do you.
The upside ceiling is real — Amazon shareholders from 2001 are up something like 50,000%. But the downside is also real. Enron shareholders lost everything when the company collapsed in 2001. Bed Bath & Beyond. Blockbuster. Companies fail.
Most individual investors who pick stocks underperform simple index funds over any long period. This isn't about intelligence — it's that prices already reflect most publicly available information, making it genuinely hard to have an edge. Professional fund managers, with full-time research teams, fail at this consistently.
ETFs
An ETF (exchange-traded fund) is a basket of investments packaged into a single security. Instead of buying one company, you buy a fund that holds many. Some ETFs track a broad market index. Others focus on specific sectors — healthcare, semiconductors, clean energy — or themes like dividends or international markets.
The key feature: ETFs trade on exchanges just like individual stocks. You can buy or sell one at any point during market hours, and the price moves throughout the day. This distinguishes them from traditional mutual funds, which only settle once per day after markets close.
SPY — the SPDR S&P 500 ETF — is one of the most traded securities in the world. One share gives you exposure to all 500 companies in the S&P 500: Apple, Microsoft, Amazon, JPMorgan, UnitedHealth, and 495 more. You're spreading across the biggest chunk of the US economy in a single purchase.
Index funds
An index fund is a fund — structured either as an ETF or a mutual fund — built specifically to track a market index as closely as possible. The S&P 500 index fund doesn't try to beat the market. It just tries to match it, automatically, by holding the same companies in the same proportions.
Passive management means no one is deciding what to buy. That keeps fees extremely low — Vanguard's VTSAX (total US market) charges 0.04% per year. Actively managed funds typically charge 10–30x more, and the extra cost rarely pays for itself.
The record on active management
Over any 15-year period, roughly 85–90% of actively managed US equity funds underperform their benchmark index, after fees. Index funds have now taken in more total investor money than all active funds combined.
How they compare
The trade-offs come down to three things: concentration, cost, and effort.
- 1
Individual stocks
One company, high potential upside and downside, requires ongoing research and attention.
- 2
ETFs
Diversified across many holdings, trade like stocks, range from very broad to very narrow.
- 3
Index funds
Passively track an index, lowest fees, historically beat most active alternatives over long periods, minimal maintenance.
Key Takeaways
- Individual stocks: one company, concentrated risk and reward, requires genuine research
- ETFs: baskets of securities that trade throughout the day, flexible, can be sector-specific or broad
- Index funds: passively track a market index, lowest fees, outperform most active funds over time
- Most individual investors and professional fund managers underperform simple index funds long-term
Keep Learning
How the Stock Market Works
What stocks actually are, why prices move, and what 'the market is up today' actually means.
How to Start Investing
The building blocks — accounts, assets, and how compounding actually works over time.
Understanding Risk & Diversification
What risk actually means in investing, the types that exist, and why spreading money around changes the math.