IVW vs SPY: 66% overlap
iShares S&P 500 Growth ETF and SPDR S&P 500 ETF Trust share 65.7% 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 1.3. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
IVW and SPY hold 147 of the same securities. The ten contributing most to the overlap figure:
| Holding | in IVW | in SPY | Δ |
|---|---|---|---|
| NVDA | 14.7% | 7.9% | 6.7% |
| AAPL | 6.9% | 7.4% | 0.6% |
| MSFT | 8.2% | 4.4% | 3.8% |
| AMZN | 3.5% | 3.6% | 0.1% |
| GOOGL | 5.4% | 2.9% | 2.5% |
| AVGO | 5.4% | 2.9% | 2.5% |
| GOOG | 4.4% | 2.4% | 2.0% |
| META | 3.9% | 2.1% | 1.8% |
| MU | 3.2% | 1.8% | 1.5% |
| LLY | 2.7% | 1.5% | 1.2% |
Where IVW and SPY 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 | IVW | SPY | Δ |
|---|---|---|---|
| Information Technology | 52.5% | 37.5% | +15.0pp |
| Communication Services | 14.7% | 9.3% | +5.4pp |
| Consumer Staples | 1.2% | 4.6% | −3.5pp |
| Energy | 0.0% | 3.4% | −3.4pp |
| Financials | 9.2% | 12.4% | −3.2pp |
| Health Care | 6.3% | 9.1% | −2.8pp |
| Industrials | 6.6% | 8.9% | −2.2pp |
| Utilities | 0.4% | 2.3% | −1.9pp |
Δ is IVW minus SPY, 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
0.1% of IVW by weight, held in no part of SPY.
32.9% of SPY by weight, held in no part of IVW.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| IVW | SPY | |
|---|---|---|
| Top 10 holdings | 58.2% | 36.9% |
| Positions held | 149 | 505 |
| Cost per $10,000 held, per year | $18 | $9 |
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 IVW and SPY overlap?
IVW and SPY overlap 65.7% by portfolio weight — substantial duplication if you hold both. They share 147 holdings. The figure comes from current issuer holdings files (IVW as of 2026-07-23, SPY as of 2026-07-23).
How is the overlap between IVW and SPY calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If IVW holds a stock at 6% and SPY 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 IVW and SPY?
That depends on your goals — we state facts, not advice. At 65.7% overlap, each fund still contributes meaningfully distinct exposure.
What does IVW own that SPY doesn't?
IVW holds 149 positions and SPY holds 505; 1 of IVW's positions don't appear in SPY at all, and they are 0.1% of IVW by weight.
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Related comparisons
Sources: issuer holdings files, IVW as of 2026-07-23, SPY as of 2026-07-23. Weights are fractions of each fund. Diagnostics, not advice.