DIA vs SPLG: 28% overlap
SPDR Dow Jones Industrial Average ETF and SPDR Portfolio S&P 500 ETF (now SPYM) share 27.7% 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 1.7. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
DIA and SPLG hold 30 of the same securities. The ten contributing most to the overlap figure:
| Holding | in DIA | in SPLG | Δ |
|---|---|---|---|
| MSFT | 4.4% | 4.4% | 0.1% |
| AAPL | 3.7% | 7.4% | 3.7% |
| GOOGL | 3.6% | 2.9% | 0.7% |
| AMZN | 2.7% | 3.6% | 0.9% |
| NVDA | 2.4% | 7.9% | 5.5% |
| JPM | 4.0% | 1.5% | 2.5% |
| JNJ | 3.0% | 1.0% | 2.0% |
| V | 4.0% | 0.9% | 3.1% |
| WMT | 1.2% | 0.7% | 0.5% |
| CSCO | 1.3% | 0.7% | 0.6% |
Where DIA and SPLG 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 | DIA | SPLG | Δ |
|---|---|---|---|
| Information Technology | 15.9% | 37.5% | −21.6pp |
| Financials | 28.6% | 12.4% | +16.3pp |
| Industrials | 17.5% | 8.9% | +8.6pp |
| Communication Services | 4.7% | 9.3% | −4.6pp |
| Health Care | 13.6% | 9.1% | +4.5pp |
| Utilities | 0.0% | 2.3% | −2.3pp |
| Real Estate | 0.0% | 1.9% | −1.9pp |
| Materials | 3.6% | 1.8% | +1.7pp |
Δ is DIA minus SPLG, 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
0.0% of DIA by weight, held in no part of SPLG.
62.0% of SPLG by weight, held in no part of DIA.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| DIA | SPLG | |
|---|---|---|
| Top 10 holdings | 56.2% | 36.9% |
| Positions held | 31 | 507 |
| Cost per $10,000 held, per year | $16 | $2 |
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 DIA and SPLG overlap?
DIA and SPLG overlap 27.7% by portfolio weight — moderate overlap. They share 30 holdings. The figure comes from current issuer holdings files (DIA as of 2026-07-23, SPLG as of 2026-07-23).
How is the overlap between DIA and SPLG calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If DIA holds a stock at 6% and SPLG 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 DIA and SPLG?
That depends on your goals — we state facts, not advice. At 27.7% overlap, each fund still contributes meaningfully distinct exposure.
What does DIA own that SPLG doesn't?
DIA holds 31 positions and SPLG holds 507; 0 of DIA's positions don't appear in SPLG at all, and they are 0.0% of DIA by weight.
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Related comparisons
Sources: issuer holdings files, DIA as of 2026-07-23, SPLG as of 2026-07-23. Weights are fractions of each fund. Diagnostics, not advice.