FXAIX vs SMH: 14% overlap
Fidelity 500 Index and VanEck Semiconductor ETF share 14.5% of their portfolios by weight — computed as Σ min(wA, wB) over every holding both funds own.
Different holding dates. These holdings were published 31 days apart — FXAIX as of 2026-02-28, the rest through 2026-03-31. 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 1.9. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
FXAIX and SMH hold 19 of the same securities. The ten contributing most to the overlap figure:
| Holding | in FXAIX | in SMH | Δ |
|---|---|---|---|
| NVDA | 7.3% | 19.6% | 12.3% |
| AVGO | 2.6% | 7.8% | 5.2% |
| MU | 0.8% | 4.2% | 3.4% |
| AMD | 0.6% | 4.7% | 4.1% |
| AMAT | 0.5% | 4.6% | 4.1% |
| LRCX | 0.5% | 4.6% | 4.1% |
| INTC | 0.3% | 4.3% | 4.0% |
| KLAC | 0.3% | 4.7% | 4.4% |
| TXN | 0.3% | 4.6% | 4.3% |
| ADI | 0.3% | 4.7% | 4.4% |
Where FXAIX and SMH 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 | FXAIX | SMH | Δ |
|---|---|---|---|
| Information Technology | 31.8% | 92.8% | −61.0pp |
| Financials | 12.0% | 0.0% | +12.0pp |
| Communication Services | 10.5% | 0.0% | +10.5pp |
| Consumer Discretionary | 9.7% | 0.0% | +9.7pp |
| Health Care | 9.6% | 0.0% | +9.6pp |
| Industrials | 8.3% | 0.0% | +8.3pp |
| Consumer Staples | 5.4% | 0.0% | +5.4pp |
| Unclassified | 3.3% | 7.2% | −3.9pp |
Δ is FXAIX minus SMH, 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
85.7% of FXAIX by weight, held in no part of SMH.
21.4% of SMH by weight, held in no part of FXAIX.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| FXAIX | SMH | |
|---|---|---|
| Top 10 holdings | 36.4% | 72.2% |
| Positions held | 506 | 26 |
| Cost per $10,000 held, per year | $1 | $35 |
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 FXAIX and SMH overlap?
FXAIX and SMH overlap 14.5% by portfolio weight — largely distinct portfolios. They share 19 holdings. The figure comes from current issuer holdings files (FXAIX as of 2026-02-28, SMH as of 2026-03-31).
How is the overlap between FXAIX and SMH calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If FXAIX holds a stock at 6% and SMH 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 FXAIX and SMH?
That depends on your goals — we state facts, not advice. At 14.5% overlap, each fund still contributes meaningfully distinct exposure.
What does FXAIX own that SMH doesn't?
FXAIX holds 506 positions and SMH holds 26; 486 of FXAIX's positions don't appear in SMH at all, and they are 85.7% of FXAIX by weight.
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Related comparisons
Sources: issuer holdings files, FXAIX as of 2026-02-28, SMH as of 2026-03-31. Weights are fractions of each fund. Diagnostics, not advice.