DIA vs PRGFX: 20% overlap
SPDR Dow Jones Industrial Average ETF and T. Rowe Price Growth Stock share 20.2% 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 4 months apart — PRGFX as of 2026-03-31, 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 1.8. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
DIA and PRGFX hold 9 of the same securities. The ten contributing most to the overlap figure:
| Holding | in DIA | in PRGFX | Δ |
|---|---|---|---|
| MSFT | 4.4% | 9.1% | 4.7% |
| AAPL | 3.7% | 11.1% | 7.4% |
| GOOGL | 3.6% | 7.0% | 3.4% |
| AMZN | 2.7% | 4.9% | 2.2% |
| NVDA | 2.4% | 13.8% | 11.4% |
| V | 4.0% | 2.3% | 1.7% |
| BA | 2.4% | 0.5% | 1.9% |
| UNH | 4.9% | 0.3% | 4.5% |
| SHW | 3.6% | 0.2% | 3.3% |
Where DIA and PRGFX 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 | PRGFX | Δ |
|---|---|---|---|
| Information Technology | 15.9% | 48.2% | −32.3pp |
| Financials | 28.6% | 5.1% | +23.6pp |
| Industrials | 17.5% | 5.6% | +11.9pp |
| Communication Services | 4.7% | 13.1% | −8.4pp |
| Health Care | 13.6% | 6.5% | +7.2pp |
| Unclassified | 0.0% | 5.9% | −5.9pp |
| Cash & Other | 0.1% | 3.5% | −3.4pp |
| Materials | 3.6% | 0.2% | +3.3pp |
Δ is DIA minus PRGFX, 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
68.3% of DIA by weight, held in no part of PRGFX.
47.4% of PRGFX 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 | PRGFX | |
|---|---|---|
| Top 10 holdings | 56.2% | 62.8% |
| Positions held | 31 | 79 |
| Cost per $10,000 held, per year | $16 | $64 |
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 PRGFX overlap?
DIA and PRGFX overlap 20.2% by portfolio weight — moderate overlap. They share 9 holdings. The figure comes from current issuer holdings files (DIA as of 2026-07-23, PRGFX as of 2026-03-31).
How is the overlap between DIA and PRGFX 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 PRGFX 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 PRGFX?
That depends on your goals — we state facts, not advice. At 20.2% overlap, each fund still contributes meaningfully distinct exposure.
What does DIA own that PRGFX doesn't?
DIA holds 31 positions and PRGFX holds 79; 21 of DIA's positions don't appear in PRGFX at all, and they are 68.3% of DIA by weight.
You probably hold more than two funds
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Related comparisons
Sources: issuer holdings files, DIA as of 2026-07-23, PRGFX as of 2026-03-31. Weights are fractions of each fund. Diagnostics, not advice.