SOXX vs TSPC: 19% overlap
iShares Semiconductor ETF and TSP C Fund — shown via S&P 500 proxy share 19.2% 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 1.8. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
SOXX and TSPC hold 19 of the same securities. The ten contributing most to the overlap figure:
| Holding | in SOXX | in TSPC | Δ |
|---|---|---|---|
| NVDA | 8.3% | 7.5% | 0.7% |
| AVGO | 7.3% | 2.8% | 4.6% |
| MU | 8.5% | 2.0% | 6.5% |
| AMD | 8.7% | 1.5% | 7.3% |
| INTC | 5.3% | 1.0% | 4.3% |
| AMAT | 5.2% | 0.9% | 4.3% |
| LRCX | 4.2% | 0.8% | 3.4% |
| KLAC | 4.8% | 0.6% | 4.1% |
| TXN | 3.9% | 0.4% | 3.5% |
| MRVL | 4.3% | 0.4% | 3.9% |
Where SOXX and TSPC 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 | TSPC | Δ |
|---|---|---|---|
| Information Technology | 99.9% | 38.0% | +61.9pp |
| Financials | 0.0% | 11.6% | −11.6pp |
| Communication Services | 0.0% | 9.7% | −9.7pp |
| Consumer Discretionary | 0.0% | 9.3% | −9.3pp |
| Industrials | 0.0% | 8.9% | −8.9pp |
| Health Care | 0.0% | 8.9% | −8.9pp |
| Consumer Staples | 0.0% | 4.6% | −4.6pp |
| Energy | 0.0% | 3.0% | −3.0pp |
Δ is SOXX minus TSPC, 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
18.1% of SOXX by weight, held in no part of TSPC.
80.7% of TSPC 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 | TSPC | |
|---|---|---|
| Top 10 holdings | 60.9% | 36.4% |
| Positions held | 32 | 505 |
| 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 TSPC overlap?
SOXX and TSPC overlap 19.2% by portfolio weight — moderate overlap. They share 19 holdings. The figure comes from current issuer holdings files (SOXX as of 2026-07-23, TSPC as of 2026-06-30).
How is the overlap between SOXX and TSPC 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 TSPC 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 TSPC?
That depends on your goals — we state facts, not advice. At 19.2% overlap, each fund still contributes meaningfully distinct exposure.
What does SOXX own that TSPC doesn't?
SOXX holds 32 positions and TSPC holds 505; 12 of SOXX's positions don't appear in TSPC at all, and they are 18.1% 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, TSPC as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.