Guide

How to Build a Diversified ETF Portfolio from Scratch

Most people think building an investment portfolio is complicated or only for the wealthy. It isn't. ETFs have made professional-quality diversification accessible to anyone with a brokerage account. By the end of this guide, you'll know exactly how to build yours.

What is an ETF and why use one?

An ETF (Exchange-Traded Fund) is a basket of assets — stocks, bonds, commodities — that trades on a stock exchange like a single share. When you buy one ETF, you instantly own a small piece of every company inside it.

Take VOO (Vanguard S&P 500 ETF) as an example. The S&P 500 is an index of the 500 largest publicly traded companies in the US: Apple, Microsoft, Amazon, JPMorgan, Johnson & Johnson, and 495 others. VOO simply holds all of them, weighted by size. When you buy one share of VOO, you own a tiny slice of every one of those companies. If one collapses, it barely moves your portfolio. If the US economy grows, you grow with it. The expense ratio is 0.03% per year — virtually free.

Compare these two choices: buying Intel (INTC) or Microsoft (MSFT) — both blue-chip tech companies, both household names in 2021. One fell over 60% and spent years underwater. The other outperformed the market. But buying VOO (Vanguard S&P 500 ETF) gives you both, plus 498 other companies, in one trade — without requiring you to know in advance which was which.

Here's how that played out over the past 5 years, indexed to 100 at the start:

Intel has recently spiked sharply — but to get that recovery you'd have had to hold through a 60%+ loss over three years. Most investors can't do that. Microsoft compounded steadily and outperformed VOO, but only marginally. VOO sat quietly in the middle the whole time, gaining over 80%, with none of the gut-wrenching drawdowns. The ETF doesn't require you to be right — or to hold your nerve while a stock bleeds for years waiting for a recovery that might never come.

Beyond diversification, ETFs have three other advantages:

• →Low fees — expense ratios as low as 0.03%, vs 1%+ for actively managed funds
• →No stock-picking required — you get the market return, which beats most active managers long-term
• →Liquid — trade anytime the market is open, unlike mutual funds

The 3 questions to answer before picking anything

The right portfolio for a 25-year-old saving for retirement looks nothing like the right portfolio for a 55-year-old two years from retirement. Before choosing any ETF, answer these three questions:

The building blocks

A well-diversified ETF portfolio typically contains:

Three sample portfolios

Here are three concrete starting points, matched to the three most common investor profiles. These are starting points — your actual allocations should reflect your answers to the three questions above.

How to actually buy them

Once you've chosen a portfolio allocation, the execution is straightforward:

1. 1.Open a brokerage account — Trading 212, Interactive Brokers (IBKR), Fidelity, or Schwab all support ETFs.
2. 2.Set up a monthly automatic investment — pick a fixed amount and invest it every month regardless of what the market is doing. This is called dollar-cost averaging and removes the temptation to time the market.
3. 3.Rebalance once a year — markets will drift your allocations. Once a year, sell a little of what grew and buy more of what lagged to return to your target percentages.