VGT Returned 799.70% and VOO Returned 324.46% Over a Decade. Adding VUG Does Not Make It Diversified

Over the past ten years, the Vanguard Information Technology ETF (NYSEARCA:VGT) returned almost 800%. The Vanguard Growth ETF (NYSEARCA:VUG) returned 429%, and the Vanguard S&P 500 ETF (NYSEARCA:VOO) returned 324%. Someone who owns all three probably thinks they are well diversified, holding a market fund, a growth fund, and a sector fund. In practice, they hold three funds with overlapping exposure. The same few mega-cap technology companies sit near the top of each, so stacking them repeats that exposure at three levels.

Every return below is a total return, including reinvested distributions and adjusted splits, over the same one-, five-, and ten-year windows.

VOO Already Hands You a Heavy Dose of Big Tech

VOO tracks the S&P 500, which weights large U.S. companies according to their market capitalization. Under cap weighting, the more a company is worth, the bigger its share of the fund. The fund held 519 stocks at midyear, and information technology made up 38.0% of net assets, according to Vanguard’s semi-annual report.

That figure understates the tech exposure. Alphabet and Meta fall under communication services, which held 9.7%. Amazon and Tesla sit in consumer discretionary, at 9.3%. Late-summer holdings data ranked the four largest positions as NVIDIA (NASDAQ:NVDA | NVDA Price Prediction), Apple (NASDAQ:AAPL), Microsoft, and Amazon (per Yahoo Finance).

VOO returned 17% over one year and 86% over five, and it charges 0.03% a year. It is broad, but its biggest holdings are the names the other two funds lean on.

VUG Screens the Same Pool and Keeps the Fastest Growers

VUG tracks the Morningstar US Large Cap Growth Index. That index starts with large U.S. companies, the same universe the S&P 500 draws from, and keeps the ones with the strongest growth characteristics. Slower growers such as banks, energy producers, and consumer staples companies get filtered out, so the mega-caps that remain carry more weight.

The fact sheet from Vanguard put 65.9% of the fund in technology, a sector profile that differs from VOO’s, plus 16.2% in consumer discretionary. The fund charges 0.03%.

VUG returned 13% over one year and 85% over five. It trailed VOO in both windows and led it over ten years. So the growth screen magnified whatever its biggest holdings did, in both directions.

VGT Puts Everything on One Sector

VGT tracks the MSCI US IMI/Information Technology 25/50 index. “IMI” means it includes into mid- and small-cap stocks, but only within technology. The 25/50 rule keeps any single company under 25% of the fund and holds positions above 5% to 50% combined. That cap trims the giants without knocking them off the top.

Vanguard gives VGT a rank of 5, the top of its risk scale, and points to sector concentration as the reason. VUG rates a 4. VGT charges 0.09%.

It returned 31% over one year and 143% over five.

Its decade result came from a concentrated run in a small number of very large companies. Treat it as history.

A Wide Return Spread Comes From One Driver

An 800% decade next to 324% looks like proof that these funds act differently. The gap reflects one factor — mega-cap tech — held at three different concentration levels. When that factor rallies, the fund holding the most of it gains the most. VUG’s rank moves around because its screen also loads up on consumer names like Amazon and Tesla, but all three funds move in the same direction.

The past week showed how this works on the way down. VOO’s price fell 1.4%, VUG fell 3%, and VGT fell 5%. All three dropped together, and the most concentrated fund dropped the most. In a year when tech turns against them, expect that same pattern on a bigger scale.

When Holding Two of These Makes Sense

Wanting a growth or technology tilt is a real choice, and a defensible one. Investors who believe mega-cap tech deserves extra weight can pair VOO with a set amount of VGT and know exactly what they own.

The trouble starts when that tilt happens by accident because three fund names sound like three strategies. Decide first how much of your portfolio should ride on a few tech giants. Then size each fund to hit that number.

Add Up Your Real Exposure Across Every Fund

1. Pull each fund’s top ten holdings. Vanguard publishes them on every fund’s profile page and fact sheet, so you can check current weights instead of relying on memory.
2. Convert fund weights into portfolio weights. Multiply each company’s weight in a fund by that fund’s share of your account. This shows what NVIDIA or Apple actually represents in your money.
3. Combine the same company across funds. Add up each name’s exposure from every fund that holds it, including any individual shares you own.
4. Test your top five against a shared decline. Compare the combined weight of your five largest companies with what you could tolerate if all of them fell in the same quarter.

Portfolio analysis tools at most large brokerages will do this overlap math automatically.

Three Tickers Running on One Engine

VOO, VUG, and VGT draw on the same handful of companies, so owning all three amplifies a single exposure. That can be the right call if you size it on purpose. Before you add a fourth fund, look at the combined weight of your largest holdings. That number tells you how diversified you actually are.

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