SOXX vs VONG: 27% overlap
iShares Semiconductor ETF and Vanguard Russell 1000 Growth ETF share 27.4% of their portfolios by weight — computed as Σ min(wA, wB) over every holding both funds own.
Different holding dates. These holdings were published 27 days apart — VONG as of 2026-06-30, the rest through 2026-07-27. Each fund is compared using its most recent file, so any trading in between shows up as a difference.
You would hold two tickers and get the diversification of 1.7. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
SOXX and VONG hold 20 of the same securities. The ten contributing most to the overlap figure:
| Holding | in SOXX | in VONG | Δ |
|---|---|---|---|
| NVDA | 8.3% | 13.8% | 5.5% |
| AVGO | 7.7% | 5.2% | 2.5% |
| MU | 8.3% | 3.9% | 4.4% |
| AMD | 8.6% | 2.8% | 5.8% |
| AMAT | 5.1% | 1.7% | 3.4% |
| LRCX | 4.1% | 1.6% | 2.5% |
| KLAC | 4.7% | 1.2% | 3.6% |
| TXN | 4.1% | 0.8% | 3.3% |
| MRVL | 4.1% | 0.8% | 3.3% |
| TER | 2.9% | 0.2% | 2.7% |
Where SOXX and VONG 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 | SOXX | VONG | Δ |
|---|---|---|---|
| Information Technology | 99.9% | 54.3% | +45.6pp |
| Communication Services | 0.0% | 16.1% | −16.1pp |
| Industrials | 0.0% | 8.8% | −8.8pp |
| Consumer Discretionary | 0.0% | 8.2% | −8.2pp |
| Health Care | 0.0% | 5.4% | −5.4pp |
| Financials | 0.0% | 4.3% | −4.3pp |
| Consumer Staples | 0.0% | 1.3% | −1.3pp |
| Energy | 0.0% | 0.4% | −0.4pp |
Δ is SOXX minus VONG, 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
23.5% of SOXX by weight, held in no part of VONG.
66.9% of VONG by weight, held in no part of SOXX.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| SOXX | VONG | |
|---|---|---|
| Top 10 holdings | 60.4% | 54.3% |
| Positions held | 32 | 370 |
| Cost per $10,000 held, per year | $34 | $6 |
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 SOXX and VONG overlap?
SOXX and VONG overlap 27.4% by portfolio weight — moderate overlap. They share 20 holdings. The figure comes from current issuer holdings files (SOXX as of 2026-07-27, VONG as of 2026-06-30).
How is the overlap between SOXX and VONG calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If SOXX holds a stock at 6% and VONG 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 SOXX and VONG?
That depends on your goals — we state facts, not advice. At 27.4% overlap, each fund still contributes meaningfully distinct exposure.
What does SOXX own that VONG doesn't?
SOXX holds 32 positions and VONG holds 370; 11 of SOXX's positions don't appear in VONG at all, and they are 23.5% of SOXX by weight.
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Related comparisons
Sources: issuer holdings files, SOXX as of 2026-07-27, VONG as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.