VOO vs VOOG Compared: 147 Stocks, Same S&P 500 Universe

I hadn't paid much attention to the Vanguard S&P 500 Growth ETF (VOOG) until recently. Most investors looking for a growth tilt on top of the S&P 500 reach for the Nasdaq-100 by default, usually VFV or ZSP next to ZQQ or XQQ, the same combination I compared in an earlier post. VOOG barely comes up next to it.

That's worth fixing. VOOG isn't a smaller, lesser-known version of the Nasdaq-100. It's a completely different mechanism for getting growth exposure, built directly out of the S&P 500 itself rather than out of a stock exchange listing. I'll put VOOG head-to-head against QQQ directly in a separate post, but that comparison only makes sense once you understand what VOOG actually holds and how it differs from simply owning VOO.

The first question was how much new territory VOOG actually covers. The answer is none. Every company in VOOG comes from the S&P 500. It doesn't expand your investment universe at all — it takes the S&P 500, identifies the companies displaying stronger growth characteristics, removes most of the rest, and changes the weights.

That makes the decision between VOO and VOOG less about diversification and more about a much simpler question:

Do you want to own the S&P 500 as the market weights it, or deliberately give more of your money to the companies currently displaying growth characteristics?

VOO exposure is easy to buy in Canadian dollars. VFV, ZSP and XUS are among the Canadian-listed ETFs providing straightforward S&P 500 exposure. VOOG is different — at the time of writing, I haven't found a Canadian-listed ETF that directly tracks the S&P 500 Growth Index.

Canadian investors wanting this exact methodology generally need to buy VOOG in U.S. dollars rather than choosing a direct TSX-listed equivalent, which introduces another practical consideration around currency conversion and account placement that doesn't exist to the same degree with a Canadian-listed S&P 500 ETF. That's worth knowing before reading further. The investment thesis may be simple. The Canadian implementation is not.

With that said, here is what VOOG actually does.

VOO tracks the S&P 500. It currently owns just over 500 securities representing roughly 500 of the largest U.S. companies, market-cap weighted so larger companies receive larger allocations. VOOG starts with exactly that universe, but it does not keep everything.

Instead, the S&P 500 Growth Index evaluates S&P 500 companies according to three growth characteristics:

→ Sales growth
→ The ratio of earnings change to price
→ Price momentum

Companies displaying stronger growth characteristics receive greater representation in the Growth Index. As of June 30, 2026, only 147 S&P 500 constituents were represented in it.

That immediately changes how I think about VOOG. It isn't another U.S. stock index sitting beside the S&P 500. It is a filtered version of the S&P 500 itself.

VOO says: Own the large U.S. market and let market capitalization determine the weights.

VOOG says: Start with that same market, identify the companies exhibiting growth characteristics, and concentrate the portfolio around them.

The distinction matters.

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Growth can become a vague investing label. Fast-growing company. Technology company. Expensive stock. Innovative company. Those ideas often get mixed together, but the S&P methodology is more specific.

A company is evaluated using sales growth, earnings change relative to price, and momentum. S&P also separately evaluates value characteristics to determine where companies belong within its style indexes. That means VOOG isn't simply buying technology companies or companies with high price-to-earnings ratios — it is applying a rules-based growth classification to the S&P 500.

There is another detail worth knowing: growth and value are not always mutually exclusive. A company can exhibit characteristics of both, and S&P can allocate a company's market capitalization between its Growth and Value indexes rather than forcing every company entirely into one bucket. Apple illustrates why this matters — it can remain an enormous position in the broad S&P 500 while its relative representation within the Growth Index shifts as its growth and value characteristics evolve.

The Growth Index is therefore not a permanent list of America's favourite growth companies. It is a periodically refreshed classification, rebalanced annually in December with quarterly reviews in March, June and September.

The first obvious difference is breadth.

The 147 figure is particularly important. VOOG isn't adding 147 growth companies to what you already own. VOO already owns every one of them. The difference is what happens to your money after you make the switch.

This is the same principle that matters when comparing the S&P 500 with the Nasdaq-100. Market-cap weighting already allows successful companies to become increasingly important, and Nvidia is the obvious example. As its market capitalization increased, its weight inside the S&P 500 increased automatically — an S&P 500 investor didn't need to identify Nvidia as a growth company and add it separately. The index did the reweighting naturally as Nvidia became more valuable. As of May 31, 2026, Nvidia represented approximately 7.9% of VOO.

VOOG takes that existing mechanism and pushes considerably further. Around the same period, Nvidia represented roughly 14% of the S&P 500 Growth portfolio. You aren't gaining Nvidia by moving money from VOO into VOOG. You are saying:

I want considerably more Nvidia than the market itself currently gives me.

The same principle applies across the portfolio.

The largest holdings make the difference easier to see.

Recent Vanguard holdings show approximately:

*VOO figures are from May 31, 2026 Vanguard holdings; VOOG holding-level figures are from April 30, 2026 and will drift with market prices.

This table reveals something important: VOOG isn't simply "more Magnificent Seven." Apple was actually a smaller position in VOOG than in VOO at these reporting dates. Why? Because company size and growth classification are two different things. Apple is enormous, which gives it an enormous S&P 500 weight, but VOOG isn't asking only how large Apple is — its style methodology is also determining how much of Apple's capitalization belongs on the growth side.

Meanwhile, Nvidia, Microsoft, Alphabet and Broadcom receive substantially greater representation. That is a much more deliberate growth tilt than simply buying another market-cap index.

The portfolio shift becomes even clearer when you look beyond individual companies. As of May 31, 2026:

VOOG pushes information technology from about 39% of the portfolio to nearly 53%, and communication services rises from about 10% to 16%. Meanwhile, consumer staples almost disappear, utilities, real estate and materials become tiny positions, and energy disappears from the current Growth Index entirely.

This is what buying VOOG actually accomplishes. You aren't adding growth to a portfolio that didn't have it. You are removing much of the slower-growing side of the S&P 500 and reallocating that capital toward the growth side.

This is where I find VOOG particularly interesting.

The Nasdaq-100 is commonly used as a growth allocation, but it isn't actually a growth index. QQQ tracks 100 of the largest eligible non-financial companies listed on Nasdaq. A company qualifies because of its size, sector and exchange listing, not because it satisfies any growth criteria.

VOOG doesn't care where an S&P 500 company trades. It asks whether the company displays the characteristics S&P defines as growth, which is how names like Eli Lilly and qualifying financial or industrial companies can end up in VOOG despite never qualifying for the Nasdaq-100 based on its construction rules.

The Nasdaq-100's growth exposure is largely an outcome of which companies happen to dominate Nasdaq. VOOG's growth exposure is the objective.

That difference is big enough to deserve its own comparison, which I'll get into properly in a separate post on QQQ versus VOOG. For this post, the point is narrower: VOOG is not just a more selective way to buy the Nasdaq-100.

This is the part investors need to understand if they already own VOO. When I compared the Nasdaq-100 with the S&P 500, there were at least some companies available through the Nasdaq-100 that weren't already in the S&P 500. With VOOG, that number is zero — every dollar invested in VOOG goes toward companies drawn from the S&P 500 universe.

That makes VOOG a pure reweighting decision. If you already hold VOO and add VOOG, you haven't expanded your universe by one company. You've increased some positions and reduced the relative influence of hundreds of others.

Suppose you decide that VOO should remain your core holding but you want VOOG as a growth tilt. Consider an 80/20 portfolio:

→ 80% VOO
→ 20% VOOG

Using the May 2026 sector weights, your information technology exposure becomes approximately: 80% × 38.6% + 20% × 52.6% = 41.4%

You've moved technology from 38.6% to 41.4%. At 50/50, it becomes approximately 45.6%. At 100% VOOG, it reaches 52.6%.

This is a useful way to think about combining the funds. VOOG doesn't create a separate growth sleeve in an economic sense. It creates a dial. Turn it toward VOOG and you progressively reduce the influence of the slower-growth portions of the S&P 500 while increasing the influence of companies currently classified toward growth.

This may be the more important question. Investors naturally focus on what they're buying, but every overweight creates an underweight somewhere else.

VOOG currently has no meaningful energy exposure. Consumer staples fall from 4.6% of VOO to just 1.1%, utilities fall from 2.1% to 0.4%, and real estate falls from 1.8% to 0.5%. Health care and industrials are also reduced, and even financials, which are allowed in the S&P 500 Growth Index, fall from 11.3% to 8.3%.

That means moving toward VOOG is also a decision to give less influence to businesses such as energy producers, defensive consumer companies, utilities and other mature businesses that don't currently satisfy the growth methodology strongly enough. That can work extremely well when growth leads the market. It can also work against you when leadership changes.

This is an important distinction. S&P isn't separating the 500 companies into good businesses and bad businesses — it is separating them according to investment style characteristics.

A mature company with slower revenue growth, strong cash flow, a substantial dividend and a reasonable valuation can be an excellent business while receiving little or no VOOG allocation. Likewise, a company experiencing rapid growth and strong momentum can receive a large VOOG allocation while trading at a considerably higher valuation.

Growth describes characteristics. It does not guarantee future returns. And because VOOG's classifications are periodically refreshed, today's growth company does not necessarily remain tomorrow's growth company.

"147 companies" still sounds reasonably diversified. The weights tell a different story. As of June 30, 2026, the ten largest companies represented approximately 56% of the S&P 500 Growth Index, and more than half of the portfolio was therefore concentrated in ten securities. Information technology alone represented about 52%.

VOOG may own nearly 150 securities, but its returns are heavily influenced by a relatively small number of mega-cap growth companies. That isn't necessarily bad, but it isn't the same risk profile as spreading capital across the entire S&P 500. More holdings do not automatically mean more diversification, and fewer holdings do not automatically mean unacceptable concentration.

What matters is where the money actually sits.

There is also a strong argument for doing nothing.

VOO doesn't permanently allocate the same amount to every company. If a new company becomes one of America's dominant businesses, its market capitalization rises and its influence over the S&P 500 rises with it — if Nvidia continues becoming more valuable, VOO gives Nvidia more weight. If the next great American company isn't currently considered a growth stock, or doesn't even exist yet, the S&P 500 can eventually give it substantial weight as it grows. VOO doesn't require an investor to determine which style will lead next.

VOOG introduces an additional decision: Growth characteristics deserve a larger allocation than the market is currently giving them.

That may prove correct. But it is an active portfolio opinion implemented through a passive ETF.

None of this means combining VOO and VOOG is a mistake.

An investor may deliberately believe that companies with stronger revenue growth, earnings improvement and momentum deserve more of the portfolio, and may want VOO to remain the foundation while increasing exposure to those characteristics. An 80/20 or 75/25 allocation can accomplish that without abandoning the broader S&P 500.

The important thing is recognizing what the second ETF is doing. It isn't diversification. It isn't giving you another part of the U.S. stock market. And it isn't introducing companies you couldn't access through VOO.

It is changing the weights.

Before adding VOOG to an S&P 500 position, I would ask four questions:

→ Which new companies am I gaining? None.

→ Which existing companies am I increasing? Primarily companies currently scoring strongly on S&P's growth characteristics, with Nvidia, Microsoft, Alphabet and Broadcom among the most important current examples.

→ Which parts of my portfolio am I reducing? Energy, consumer staples, utilities, real estate and many slower-growth companies become much less influential.

→ Why do I believe the growth subset deserves more of my money than the market gives it? That last question is the investment thesis.

VOOG is not a more diversified version of VOO. It is not simply "VOO with better companies." And it isn't quite the same bet as the Nasdaq-100. It is a concentrated, rules-based growth tilt carved directly out of the S&P 500.

VOO lets the market decide how much of your portfolio belongs in growth companies. VOOG takes the same starting universe and deliberately turns that allocation higher. If you own both, you aren't expanding your portfolio. You're turning the growth dial.

Make sure that's what you intended to do.

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