QQQ vs XLK: 56% overlap
Invesco QQQ Trust and Technology Select Sector SPDR Fund share 56.3% 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 1.4. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
QQQ and XLK hold 37 of the same securities. The ten contributing most to the overlap figure:
| Holding | in QQQ | in XLK | Δ |
|---|---|---|---|
| NVDA | 8.3% | 14.1% | 5.8% |
| AAPL | 7.8% | 13.2% | 5.4% |
| MSFT | 4.7% | 7.9% | 3.2% |
| MU | 5.1% | 4.3% | 0.8% |
| AMD | 4.0% | 4.7% | 0.7% |
| AVGO | 3.1% | 5.2% | 2.1% |
| INTC | 2.3% | 3.2% | 0.9% |
| AMAT | 2.0% | 3.0% | 1.0% |
| CSCO | 2.0% | 3.0% | 1.0% |
| LRCX | 1.8% | 2.7% | 0.9% |
Where QQQ 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 | QQQ | XLK | Δ |
|---|---|---|---|
| Information Technology | 59.1% | 99.9% | −40.8pp |
| Communication Services | 13.1% | 0.0% | +13.1pp |
| Consumer Discretionary | 10.0% | 0.0% | +10.0pp |
| Consumer Staples | 6.4% | 0.0% | +6.4pp |
| Health Care | 3.6% | 0.0% | +3.6pp |
| Industrials | 3.5% | 0.0% | +3.5pp |
| Utilities | 1.2% | 0.0% | +1.2pp |
| Materials | 1.1% | 0.0% | +1.1pp |
Δ is QQQ 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
42.8% of QQQ by weight, held in no part of XLK.
14.9% of XLK by weight, held in no part of QQQ.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| QQQ | XLK | |
|---|---|---|
| Top 10 holdings | 45.9% | 61.3% |
| Positions held | 104 | 76 |
| Cost per $10,000 held, per year | $20 | $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 QQQ and XLK overlap?
QQQ and XLK overlap 56.3% by portfolio weight — substantial duplication if you hold both. They share 37 holdings. The figure comes from current issuer holdings files (QQQ as of 2026-07-23, XLK as of 2026-07-23).
How is the overlap between QQQ and XLK calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If QQQ 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 QQQ and XLK?
That depends on your goals — we state facts, not advice. At 56.3% overlap, each fund still contributes meaningfully distinct exposure.
What does QQQ own that XLK doesn't?
QQQ holds 104 positions and XLK holds 76; 67 of QQQ's positions don't appear in XLK at all, and they are 42.8% of QQQ by weight.
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Related comparisons
Sources: issuer holdings files, QQQ as of 2026-07-23, XLK as of 2026-07-23. Weights are fractions of each fund. Diagnostics, not advice.