SOXX vs VTWNX: 4% overlap
iShares Semiconductor ETF and Vanguard Target Retirement 2020 share 3.7% of their portfolios by weight — computed as Σ min(wA, wB) over every holding both funds own.
Different holding dates. These holdings were published about 4 months apart — VTWNX as of 2026-03-31, the rest through 2026-07-23. 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 2.0. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
SOXX and VTWNX hold 28 of the same securities. The ten contributing most to the overlap figure:
| Holding | in SOXX | in VTWNX | Δ |
|---|---|---|---|
| NVDA | 8.3% | 1.3% | 7.0% |
| AVGO | 7.3% | 0.5% | 6.8% |
| MU | 8.5% | 0.4% | 8.2% |
| AMD | 8.7% | 0.3% | 8.5% |
| ASML | 2.4% | 0.2% | 2.2% |
| AMAT | 5.2% | 0.2% | 5.1% |
| INTC | 5.3% | 0.2% | 5.1% |
| LRCX | 4.2% | 0.1% | 4.0% |
| CASH | 0.1% | 1.7% | 1.5% |
| KLAC | 4.8% | 0.1% | 4.6% |
Where SOXX and VTWNX 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 | VTWNX | Δ |
|---|---|---|---|
| Information Technology | 99.9% | 10.0% | +89.9pp |
| Unclassified | 0.0% | 29.8% | −29.8pp |
| Treasuries | 0.0% | 17.1% | −17.1pp |
| Financials | 0.0% | 8.2% | −8.2pp |
| MBS Pass-Through | 0.0% | 7.2% | −7.2pp |
| Corporate — industrial & other | 0.0% | 5.5% | −5.5pp |
| Industrials | 0.0% | 4.0% | −4.0pp |
| Consumer Discretionary | 0.0% | 2.9% | −2.9pp |
Δ is SOXX minus VTWNX, 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
8.7% of SOXX by weight, held in no part of VTWNX.
94.6% of VTWNX 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 | VTWNX | |
|---|---|---|
| Top 10 holdings | 60.9% | 44.9% |
| Positions held | 32 | 7 |
| Cost per $10,000 held, per year | $34 | $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 SOXX and VTWNX overlap?
SOXX and VTWNX overlap 3.7% by portfolio weight — largely distinct portfolios. They share 28 holdings. The figure comes from current issuer holdings files (SOXX as of 2026-07-23, VTWNX as of 2026-03-31).
How is the overlap between SOXX and VTWNX 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 VTWNX 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 VTWNX?
That depends on your goals — we state facts, not advice. At 3.7% overlap, each fund still contributes meaningfully distinct exposure.
What does SOXX own that VTWNX doesn't?
SOXX holds 32 positions and VTWNX holds 7; 3 of SOXX's positions don't appear in VTWNX at all, and they are 8.7% of SOXX by weight.
You probably hold more than two funds
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Related comparisons
Sources: issuer holdings files, SOXX as of 2026-07-23, VTWNX as of 2026-03-31. Weights are fractions of each fund. Diagnostics, not advice.