FXAIX vs XLRE: 2% overlap
Fidelity 500 Index and Real Estate Select Sector SPDR Fund share 2.0% 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 5 months apart — FXAIX as of 2026-02-28, 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
FXAIX and XLRE hold 32 of the same securities. The ten contributing most to the overlap figure:
| Holding | in FXAIX | in XLRE | Δ |
|---|---|---|---|
| WELL | 0.2% | 11.7% | 11.5% |
| PLD | 0.2% | 9.1% | 8.9% |
| EQIX | 0.2% | 6.9% | 6.7% |
| AMT | 0.2% | 5.2% | 5.0% |
| SPG | 0.1% | 4.9% | 4.8% |
| O | 0.1% | 4.7% | 4.6% |
| DLR | 0.1% | 4.7% | 4.6% |
| PSA | 0.1% | 4.6% | 4.5% |
| CBRE | 0.1% | 4.0% | 4.0% |
| VTR | 0.1% | 4.8% | 4.8% |
Where FXAIX and XLRE 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 | XLRE | Δ |
|---|---|---|---|
| Real Estate | 2.0% | 99.9% | −97.9pp |
| 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 XLRE, 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
97.9% of FXAIX by weight, held in no part of XLRE.
0.0% of XLRE 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 | XLRE | |
|---|---|---|
| Top 10 holdings | 36.4% | 60.6% |
| Positions held | 506 | 34 |
| Cost per $10,000 held, per year | $1 | $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 FXAIX and XLRE overlap?
FXAIX and XLRE overlap 2.0% by portfolio weight — largely distinct portfolios. They share 32 holdings. The figure comes from current issuer holdings files (FXAIX as of 2026-02-28, XLRE as of 2026-07-23).
How is the overlap between FXAIX and XLRE 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 XLRE 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 XLRE?
That depends on your goals — we state facts, not advice. At 2.0% overlap, each fund still contributes meaningfully distinct exposure.
What does FXAIX own that XLRE doesn't?
FXAIX holds 506 positions and XLRE holds 34; 473 of FXAIX's positions don't appear in XLRE at all, and they are 97.9% of FXAIX by weight.
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Related comparisons
Sources: issuer holdings files, FXAIX as of 2026-02-28, XLRE as of 2026-07-23. Weights are fractions of each fund. Diagnostics, not advice.