SOXX vs TSPI: 2% overlap
iShares Semiconductor ETF and TSP I Fund — shown via international proxy share 1.9% 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 2.0. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
SOXX and TSPI hold 6 of the same securities. The ten contributing most to the overlap figure:
| Holding | in SOXX | in TSPI | Δ |
|---|---|---|---|
| ASML | 2.4% | 1.7% | 0.7% |
| CASH | 0.1% | 2.4% | 2.3% |
| NVMI | 0.8% | 0.0% | 0.7% |
| ASX | 1.2% | 0.0% | 1.2% |
| UMC | 0.9% | 0.0% | 0.9% |
| STM | 0.7% | 0.0% | 0.7% |
Where SOXX and TSPI 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 | TSPI | Δ |
|---|---|---|---|
| Information Technology | 99.9% | 20.9% | +79.0pp |
| Financials | 0.0% | 19.7% | −19.7pp |
| Industrials | 0.0% | 13.8% | −13.8pp |
| Unclassified | 0.0% | 9.1% | −9.1pp |
| Consumer Discretionary | 0.0% | 7.5% | −7.5pp |
| Health Care | 0.0% | 5.3% | −5.3pp |
| Materials | 0.0% | 5.2% | −5.2pp |
| Consumer Staples | 0.0% | 4.9% | −4.9pp |
Δ is SOXX minus TSPI, 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
93.9% of SOXX by weight, held in no part of TSPI.
95.8% of TSPI 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 | TSPI | |
|---|---|---|
| Top 10 holdings | 60.9% | 16.3% |
| Positions held | 32 | 8,453 |
| Cost per $10,000 held, per year | $34 | $5 |
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 TSPI overlap?
SOXX and TSPI overlap 1.9% by portfolio weight — largely distinct portfolios. They share 6 holdings. The figure comes from current issuer holdings files (SOXX as of 2026-07-23, TSPI as of 2026-06-30).
How is the overlap between SOXX and TSPI 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 TSPI 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 TSPI?
That depends on your goals — we state facts, not advice. At 1.9% overlap, each fund still contributes meaningfully distinct exposure.
What does SOXX own that TSPI doesn't?
SOXX holds 32 positions and TSPI holds 8,453; 25 of SOXX's positions don't appear in TSPI at all, and they are 93.9% 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, TSPI as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.