SPY vs XLK: 38% overlap
SPDR S&P 500 ETF Trust and Technology Select Sector SPDR Fund share 37.5% of their portfolios by weight — computed as Σ min(wA, wB) over every holding both funds own.
You would hold two tickers and get the diversification of 1.6. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
SPY and XLK hold 74 of the same securities. The ten contributing most to the overlap figure:
| Holding | in SPY | in XLK | Δ |
|---|---|---|---|
| NVDA | 7.9% | 14.1% | 6.2% |
| AAPL | 7.4% | 13.2% | 5.8% |
| MSFT | 4.4% | 7.9% | 3.5% |
| AVGO | 2.9% | 5.2% | 2.3% |
| MU | 1.8% | 4.3% | 2.5% |
| AMD | 1.4% | 4.7% | 3.3% |
| INTC | 0.7% | 3.2% | 2.5% |
| AMAT | 0.7% | 3.0% | 2.3% |
| CSCO | 0.7% | 3.0% | 2.3% |
| LRCX | 0.6% | 2.7% | 2.1% |
Where SPY and XLK differ
Sector weights as a share of each fund, ordered by the size of the gap rather than the size of the sector — two funds that overlap heavily still usually diverge somewhere.
| Sector | SPY | XLK | Δ |
|---|---|---|---|
| Information Technology | 37.5% | 99.9% | −62.4pp |
| Financials | 12.4% | 0.0% | +12.4pp |
| Communication Services | 9.3% | 0.0% | +9.3pp |
| Health Care | 9.1% | 0.0% | +9.1pp |
| Industrials | 8.9% | 0.0% | +8.9pp |
| Consumer Discretionary | 8.8% | 0.0% | +8.8pp |
| Consumer Staples | 4.6% | 0.0% | +4.6pp |
| Energy | 3.4% | 0.0% | +3.4pp |
Δ is SPY minus XLK, in percentage points. Sector data is not published by every issuer, so “Unclassified” is a real category rather than a gap in the table.
What each fund holds alone
62.4% of SPY by weight, held in no part of XLK.
0.1% of XLK by weight, held in no part of SPY.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| SPY | XLK | |
|---|---|---|
| Top 10 holdings | 36.9% | 61.3% |
| Positions held | 505 | 76 |
| Cost per $10,000 held, per year | $9 | $8 |
Cost is the expense ratio applied to $10,000; it excludes any brokerage commission, bid-ask spread or tax consequence. Figures are facts about the funds, not a suggestion about which to hold.
Frequently asked
How much do SPY and XLK overlap?
SPY and XLK overlap 37.5% by portfolio weight — moderate overlap. They share 74 holdings. The figure comes from current issuer holdings files (SPY as of 2026-07-23, XLK as of 2026-07-23).
How is the overlap between SPY and XLK calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If SPY holds a stock at 6% and XLK holds the same stock at 4%, 4% counts as shared. The result is bounded between 0% and 100%, and it is computed after looking through any fund-of-funds to the underlying holdings.
Is it redundant to hold both SPY and XLK?
That depends on your goals — we state facts, not advice. At 37.5% overlap, each fund still contributes meaningfully distinct exposure.
What does SPY own that XLK doesn't?
SPY holds 505 positions and XLK holds 76; 430 of SPY's positions don't appear in XLK at all, and they are 62.4% of SPY by weight.
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Related comparisons
Sources: issuer holdings files, SPY as of 2026-07-23, XLK as of 2026-07-23. Weights are fractions of each fund. Diagnostics, not advice.