SWTSX vs XLI: 7% overlap
Schwab Total Stock Market Index and Industrial Select Sector SPDR Fund share 7.2% 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 3 months apart — SWTSX as of 2026-04-30, 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 1.9. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
SWTSX and XLI hold 75 of the same securities. The ten contributing most to the overlap figure:
| Holding | in SWTSX | in XLI | Δ |
|---|---|---|---|
| CAT | 0.6% | 7.3% | 6.7% |
| GE | 0.4% | 6.4% | 6.0% |
| GEV | 0.4% | 4.9% | 4.5% |
| RTX | 0.3% | 5.0% | 4.6% |
| BA | 0.3% | 2.9% | 2.7% |
| UNP | 0.2% | 3.2% | 3.0% |
| UBER | 0.2% | 2.5% | 2.3% |
| DE | 0.2% | 2.7% | 2.5% |
| HON | 0.2% | 1.4% | 1.2% |
| VRT | 0.2% | 2.1% | 1.9% |
Where SWTSX and XLI 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 | SWTSX | XLI | Δ |
|---|---|---|---|
| Industrials | 9.4% | 99.9% | −90.6pp |
| Information Technology | 32.3% | 0.0% | +32.3pp |
| Financials | 11.9% | 0.0% | +11.9pp |
| Communication Services | 10.1% | 0.0% | +10.1pp |
| Consumer Discretionary | 9.6% | 0.0% | +9.6pp |
| Health Care | 8.7% | 0.0% | +8.7pp |
| Consumer Staples | 4.6% | 0.0% | +4.6pp |
| Energy | 3.5% | 0.0% | +3.5pp |
Δ is SWTSX minus XLI, 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
92.5% of SWTSX by weight, held in no part of XLI.
8.1% of XLI by weight, held in no part of SWTSX.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| SWTSX | XLI | |
|---|---|---|
| Top 10 holdings | 33.9% | 40.0% |
| Positions held | 2,939 | 83 |
| Cost per $10,000 held, per year | $3 | $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 SWTSX and XLI overlap?
SWTSX and XLI overlap 7.2% by portfolio weight — largely distinct portfolios. They share 75 holdings. The figure comes from current issuer holdings files (SWTSX as of 2026-04-30, XLI as of 2026-07-23).
How is the overlap between SWTSX and XLI calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If SWTSX holds a stock at 6% and XLI 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 SWTSX and XLI?
That depends on your goals — we state facts, not advice. At 7.2% overlap, each fund still contributes meaningfully distinct exposure.
What does SWTSX own that XLI doesn't?
SWTSX holds 2,939 positions and XLI holds 83; 2,863 of SWTSX's positions don't appear in XLI at all, and they are 92.5% of SWTSX by weight.
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Related comparisons
Sources: issuer holdings files, SWTSX as of 2026-04-30, XLI as of 2026-07-23. Weights are fractions of each fund. Diagnostics, not advice.