FXAIX vs SWISX: 0% overlap
Fidelity 500 Index and Schwab International Index share 0.3% 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 2 months apart — FXAIX as of 2026-02-28, the rest through 2026-04-30. 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
FXAIX and SWISX hold 1 of the same securities. The ten contributing most to the overlap figure:
| Holding | in FXAIX | in SWISX | Δ |
|---|---|---|---|
| CASH | 0.3% | 0.6% | 0.4% |
Where FXAIX and SWISX 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 | SWISX | Δ |
|---|---|---|---|
| Unclassified | 3.3% | 99.1% | −95.8pp |
| Information Technology | 31.8% | 0.0% | +31.8pp |
| 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 |
Δ is FXAIX minus SWISX, 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
99.9% of FXAIX by weight, held in no part of SWISX.
99.1% of SWISX 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 | SWISX | |
|---|---|---|
| Top 10 holdings | 36.4% | 13.3% |
| Positions held | 506 | 694 |
| Cost per $10,000 held, per year | $1 | $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 FXAIX and SWISX overlap?
FXAIX and SWISX overlap 0.3% by portfolio weight — largely distinct portfolios. They share 1 holdings. The figure comes from current issuer holdings files (FXAIX as of 2026-02-28, SWISX as of 2026-04-30).
How is the overlap between FXAIX and SWISX 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 SWISX 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 SWISX?
That depends on your goals — we state facts, not advice. At 0.3% overlap, each fund still contributes meaningfully distinct exposure.
What does FXAIX own that SWISX doesn't?
FXAIX holds 506 positions and SWISX holds 694; 504 of FXAIX's positions don't appear in SWISX at all, and they are 99.9% of FXAIX by weight.
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Related comparisons
Sources: issuer holdings files, FXAIX as of 2026-02-28, SWISX as of 2026-04-30. Weights are fractions of each fund. Diagnostics, not advice.