Guardfolio Research · ETF Overlap
XLK vs VOO Overlap: 36.3% of Weight in Shared Holdings
XLK (Technology Select Sector SPDR) and VOO (Vanguard S&P 500) overlap by 36.3% of normalized weight through 72 shared securities, led by NVDA, AAPL, MSFT, AVGO, MU. Here is which positions contribute most and what the result can and cannot say about diversification.
Overlap Summary
Bottom line
XLK and VOO overlap heavily: 36.3% of normalized fund weight is shared across 72 securities. Owning both repeats much of the same exposure, so treat the pair as closely related positions rather than assuming two fund labels create diversification..
The Data
Exactly which securities XLK and VOO share
The table below shows the largest contributors to overlap across the licensed full holdings, with each fund's normalized weight and the lesser weight that counts toward overlap.
| Data basis | Licensed full holdings |
|---|---|
| Fund dates | XLK 2026-08-24; VOO 2026-08-24 |
| Coverage gate | At least 97% retained per fund |
| Holding | XLK weight | VOO weight | Shared (min) |
|---|---|---|---|
| NVIDIA CORP (NVDA) | 14.22% | 7.56% | 7.56% |
| APPLE INC (AAPL) | 12.43% | 7.05% | 7.05% |
| MICROSOFT CORP (MSFT) | 9.82% | 5.37% | 5.37% |
| BROADCOM INC (AVGO) | 4.77% | 2.87% | 2.87% |
| MICRON TECHNOLOGY INC (MU) | 4.11% | 1.44% | 1.44% |
| ADVANCED MICRO DEVICES (AMD) | 4.02% | 1.21% | 1.21% |
| CISCO SYSTEMS INC (CSCO) | 2.93% | 0.71% | 0.71% |
| INTEL CORP (INTC) | 2.97% | 0.66% | 0.66% |
| APPLIED MATERIALS INC (AMAT) | 2.61% | 0.63% | 0.63% |
| LAM RESEARCH CORP (LRCX) | 2.62% | 0.57% | 0.57% |
| PALANTIR TECHNOLOGIES INC A (PLTR) | 2.76% | 0.44% | 0.44% |
| PALO ALTO NETWORKS INC (PANW) | 1.94% | 0.42% | 0.42% |
| TEXAS INSTRUMENTS INC (TXN) | 1.61% | 0.39% | 0.39% |
| KLA CORP (KLAC) | 1.60% | 0.37% | 0.37% |
| ORACLE CORP (ORCL) | 1.66% | 0.34% | 0.34% |
| AMPHENOL CORP CL A (APH) | 1.29% | 0.31% | 0.31% |
| CROWDSTRIKE HOLDINGS INC A (CRWD) | 1.30% | 0.30% | 0.30% |
| SEAGATE TECHNOLOGY HOLDINGS (STX) | 1.27% | 0.30% | 0.30% |
| WESTERN DIGITAL CORP (WDC) | 1.06% | 0.29% | 0.29% |
| ARISTA NETWORKS INC (ANET) | 1.30% | 0.29% | 0.29% |
| Total full-holdings overlap | 98.5% | 36.3% | 36.3% |
Showing the 20 largest contributors of 72 shared securities. The total uses every shared security.
The 36.3% figure uses all reported non-cash holdings and sums the lesser normalized weight for each shared security. XLK is dated 2026-08-24 with 99.934% retained coverage; VOO is dated 2026-08-24 with 99.945% retained coverage.
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Sector Picture
XLK vs VOO: sector exposure side by side
Two funds can share few holdings yet still concentrate the same sectors. Here is how the top sectors compare (33.0% combined sector overlap).
| Sector | XLK | VOO |
|---|---|---|
| Technology | 100.0% | 33.1% |
| Financial Services | 0.0% | 12.2% |
| Consumer Discretionary | 0.0% | 10.4% |
| Healthcare | 0.0% | 9.3% |
| Industrials | 0.0% | 8.6% |
| Communication Services | 0.0% | 8.2% |
The Verdict
Should you hold both XLK and VOO?
XLK and VOO overlap heavily: 36.3% of normalized fund weight is shared across 72 securities. Owning both repeats much of the same exposure, so treat the pair as closely related positions rather than assuming two fund labels create diversification.
FAQ
XLK vs VOO overlap: common questions
How much do XLK and VOO overlap?
XLK (Technology Select Sector SPDR) and VOO (Vanguard S&P 500) overlap by approximately 36.3% of normalized weight across their licensed full holdings. They share 72 securities; the largest contributors include NVDA, AAPL, MSFT, AVGO, MU, AMD, CSCO, INTC. The separately dated sector reference shows 33.0% overlap.
What stocks do XLK and VOO both hold?
Both XLK and VOO hold NVIDIA CORP (NVDA), APPLE INC (AAPL), MICROSOFT CORP (MSFT), BROADCOM INC (AVGO), MICRON TECHNOLOGY INC (MU), ADVANCED MICRO DEVICES (AMD), CISCO SYSTEMS INC (CSCO), INTEL CORP (INTC) among their top positions. These shared names account for the 36.3% weight overlap.
Is it worth holding both XLK and VOO?
XLK and VOO overlap heavily: 36.3% of normalized fund weight is shared across 72 securities. Owning both repeats much of the same exposure, so treat the pair as closely related positions rather than assuming two fund labels create diversification.
What is the difference between XLK and VOO?
XLK is a technology-sector fund (US Sector – Technology, 0.09% expense ratio) and VOO is an S&P 500 fund (US Large-Cap Blend, 0.03% expense ratio). The dataset includes 73 XLK holdings as of 2026-08-24 and 506 VOO holdings as of 2026-08-24.
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