IWD vs VOO: 58% overlap
iShares Russell 1000 Value ETF and Vanguard S&P 500 ETF share 57.7% 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 1.4. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
IWD and VOO hold 426 of the same securities. The ten contributing most to the overlap figure:
| Holding | in IWD | in VOO | Δ |
|---|---|---|---|
| AAPL | 5.9% | 6.6% | 0.7% |
| MSFT | 3.9% | 4.3% | 0.4% |
| AMZN | 5.7% | 3.6% | 2.1% |
| BRK-B | 2.5% | 1.4% | 1.1% |
| JPM | 2.6% | 1.3% | 1.3% |
| INTC | 1.2% | 1.0% | 0.2% |
| JNJ | 1.7% | 0.9% | 0.8% |
| XOM | 1.8% | 0.9% | 0.9% |
| WMT | 1.2% | 0.8% | 0.4% |
| CSCO | 1.2% | 0.7% | 0.5% |
Where IWD and VOO 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 | IWD | VOO | Δ |
|---|---|---|---|
| Information Technology | 18.0% | 38.0% | −20.0pp |
| Financials | 19.6% | 11.6% | +8.0pp |
| Communication Services | 3.3% | 9.7% | −6.4pp |
| Health Care | 12.7% | 8.9% | +3.8pp |
| Energy | 6.1% | 3.0% | +3.1pp |
| Consumer Staples | 7.4% | 4.6% | +2.8pp |
| Industrials | 11.3% | 8.9% | +2.4pp |
| Real Estate | 3.7% | 1.8% | +1.9pp |
Δ is IWD minus VOO, 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
9.5% of IWD by weight, held in no part of VOO.
38.2% of VOO by weight, held in no part of IWD.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| IWD | VOO | |
|---|---|---|
| Top 10 holdings | 27.8% | 36.4% |
| Positions held | 872 | 505 |
| Cost per $10,000 held, per year | $19 | $3 |
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 IWD and VOO overlap?
IWD and VOO overlap 57.7% by portfolio weight — substantial duplication if you hold both. They share 426 holdings. The figure comes from current issuer holdings files (IWD as of 2026-07-23, VOO as of 2026-06-30).
How is the overlap between IWD and VOO calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If IWD holds a stock at 6% and VOO 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 IWD and VOO?
That depends on your goals — we state facts, not advice. At 57.7% overlap, each fund still contributes meaningfully distinct exposure.
What does IWD own that VOO doesn't?
IWD holds 872 positions and VOO holds 505; 445 of IWD's positions don't appear in VOO at all, and they are 9.5% of IWD by weight.
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Related comparisons
Sources: issuer holdings files, IWD as of 2026-07-23, VOO as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.