AGG vs DIA: 0% overlap
iShares Core U.S. Aggregate Bond ETF and SPDR Dow Jones Industrial Average ETF share 0.0% 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 2.0. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
AGG and DIA hold 0 of the same securities. The ten contributing most to the overlap figure:
| Holding | in AGG | in DIA | Δ |
|---|
Where AGG and DIA 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 | AGG | DIA | Δ |
|---|---|---|---|
| Treasuries | 46.5% | 0.0% | +46.5pp |
| MBS Pass-Through | 24.1% | 0.0% | +24.1pp |
| Financials | 8.0% | 28.6% | −20.6pp |
| Industrials | 0.0% | 17.5% | −17.5pp |
| Information Technology | 0.0% | 15.9% | −15.9pp |
| Corporate — industrial & other | 14.3% | 0.0% | +14.3pp |
| Health Care | 0.0% | 13.6% | −13.6pp |
| Consumer Discretionary | 0.0% | 9.9% | −9.9pp |
Δ is AGG minus DIA, 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
102.1% of AGG by weight, held in no part of DIA.
99.9% of DIA by weight, held in no part of AGG.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| AGG | DIA | |
|---|---|---|
| Top 10 holdings | 75.3% | 56.2% |
| Positions held | 1,864 | 31 |
| Cost per $10,000 held, per year | $3 | $16 |
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 AGG and DIA overlap?
AGG and DIA overlap 0.0% by portfolio weight — largely distinct portfolios. They share 0 holdings. The figure comes from current issuer holdings files (AGG as of 2026-07-23, DIA as of 2026-07-23).
How is the overlap between AGG and DIA calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If AGG holds a stock at 6% and DIA 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 AGG and DIA?
That depends on your goals — we state facts, not advice. At 0.0% overlap, each fund still contributes meaningfully distinct exposure.
What does AGG own that DIA doesn't?
AGG holds 1,864 positions and DIA holds 31; 1,863 of AGG's positions don't appear in DIA at all, and they are 102.1% of AGG by weight.
You probably hold more than two funds
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Related comparisons
Sources: issuer holdings files, AGG as of 2026-07-23, DIA as of 2026-07-23. Weights are fractions of each fund. Diagnostics, not advice.