VGT is 100% technology
By construction. Every holding is classified in the technology sector by MSCI/GICS. There is no diversification benefit across sectors from VGT.
Guardfolio Research · ETF Overlap
VGT vs VOO Overlap: 21.3% of Weight in 4 Mega-Cap Tech Names
VGT and VOO share 4 top-10 holdings — Apple, Microsoft, Nvidia, and Broadcom. The minimum-weight overlap is 21.3%, smaller than QQQ vs VOO because VGT is a pure tech sector fund. But that smaller overlap is misleading: holding both amplifies technology exposure to roughly 70% of the combined portfolio, nearly doubling VOO's standalone tech tilt.
Overlap Summary
Top-10 Weight Overlap21.3%
Shared Top-104 of 10
Tech in 50/50 Blend~70%
CorrelationHigh
Bottom line
The pair is a tech sector overweight, not diversification. Useful if intentional, costly if not.
The Data
Exactly which stocks VGT and VOO share
The table below shows the 4 holdings that appear in both funds' top 10, with each fund's weight. The combined effective weight in a 50/50 portfolio is shown in the final column.
| Stock | VGT weight | VOO weight | 50/50 combined |
|---|---|---|---|
| Apple (AAPL) | 16.0% | 7.0% | 11.5% |
| Microsoft (MSFT) | 14.0% | 6.5% | 10.3% |
| Nvidia (NVDA) | 13.0% | 6.0% | 9.5% |
| Broadcom (AVGO) | 5.5% | 1.8% | 3.7% |
| Total shared weight | 48.5% | 21.3% | 35.0% |
The 21.3% overlap is the minimum-weight method (taking the lesser of each fund's weight per holding). Notice how heavily VGT concentrates in just three names: AAPL, MSFT, and NVDA together are 43% of VGT versus 19.5% of VOO. The remaining 6 names in VGT's top 10 — Oracle, Salesforce, Adobe, AMD, Cisco, ServiceNow — sit outside VOO's top 10 but still inside VOO's broader holdings.
The Real Story
Why the 21.3% number understates the concentration risk
VGT vs VOO has a lower top-10 overlap than QQQ vs VOO (32.7%) or VTI vs VOO (28.8%), but the sector concentration story is more severe:
VOO is already ~41% tech-adjacent
VOO holds 31.5% in technology plus 9.5% in communication services (which contains Alphabet, Meta, Netflix). That's already a meaningful tech tilt before adding VGT.
50/50 VGT + VOO ≈ 70% tech-adjacent
The combined exposure to technology and communication services lands near 70% of the portfolio. Almost three-quarters of every dollar moves with the tech cycle.
Top 3 names dominate both funds
Apple, Microsoft, and Nvidia together are 43% of VGT and 19.5% of VOO. In a 50/50 blend, those 3 stocks alone reach 31% of the combined portfolio.
Sector Comparison
How VGT and VOO compare on sector weight
| Sector | VGT | VOO | 50/50 blend |
|---|---|---|---|
| Technology | 100.0% | 31.5% | 65.8% |
| Communication Services | 0% | 9.5% | 4.8% |
| Financial Services | 0% | 13.5% | 6.8% |
| Healthcare | 0% | 11.0% | 5.5% |
| Consumer Discretionary | 0% | 10.5% | 5.3% |
| Tech + Comms total | 100.0% | 41.0% | 70.5% |
A 50/50 VGT + VOO portfolio leaves only ~30% of weight outside technology and communication services. By contrast, holding VOO alone leaves roughly 60% of the portfolio in non-tech sectors. The pair effectively cuts non-tech diversification in half.
Key Distinction
VGT vs VOO: what's actually different
| VGT | VOO | |
|---|---|---|
| Index tracked | MSCI US IMI Info Tech 25/50 | S&P 500 |
| Number of holdings | ~300 | ~500 |
| Tech sector weight | 100% | ~31.5% |
| Top-3 concentration | ~43% | ~19.5% |
| Top-10 weight | ~59% | ~34% |
| Expense ratio | 0.10% | 0.03% |
| Main use case | Tech sector overweight | Broad market core |
VGT is one of the most concentrated single-sector ETFs available, with 59% of weight in just 10 stocks and 43% in the top 3 alone. That concentration is the entire point of holding it — but pairing it with VOO doesn't dilute the bet, it sits on top of an already tech-tilted core.
Practical Implications
When does the overlap actually matter?
In a tech-driven bull market
The pair feels exceptional. Both funds rise together, and the shared AAPL/MSFT/NVDA/AVGO leadership produces returns that beat broad-market benchmarks. The redundancy is invisible.
When tech leadership reverses
The 70% sector concentration becomes visible. Both funds fall together because the same 4 mega-cap names drive both portfolios lower. Drawdowns are larger than a VOO-only investor would experience.
For deliberate tech overweighting
If you specifically want tech exposure above market weight, VGT on top of VOO is a clean way to express it. The structure is honest about what you're doing.
For "diversifying" a tech-heavy portfolio
If you already hold VOO and reach for VGT thinking it adds variety, you're doing the opposite. The fund deepens existing concentration in the same 4 names that already drive VOO's top decile.
Alternatives
What actually diversifies away from VGT + VOO
If your goal is genuine diversification rather than a tech tilt, these pairings with VOO add meaningfully different exposure:
VOO + IWM (0% overlap)
IWM tracks the Russell 2000 small-caps. Zero top-10 holdings overlap with VOO. True diversification across market-cap bands.
VOO + SCHD (1.8% overlap)
SCHD's dividend screen filters out most mega-cap growth names. Very low overlap, different factor exposure, different rate sensitivity.
VOO + VEA or VWO
International developed or emerging markets ETFs add geographic diversification and near-zero overlap with US mega-cap names.
VOO + VTV (large-cap value)
Value-screened large caps tilt away from the same mega-cap growth names that dominate VOO's top decile. Different factor exposure with broad-market familiarity.
Free Tool
Check VGT vs VOO in the overlap tool
The Guardfolio ETF overlap checker lets you compare VGT and VOO side by side — and see any other pair from the 22-ETF dataset. No signup needed for the two-fund comparison.
The free tool compares two ETFs using top-10 holdings data. Full portfolio analysis (all your ETFs weighted by your actual allocation) requires a free Guardfolio account with brokerage connection.
Frequently Asked Questions
VGT vs VOO overlap — common questions
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