ITOT vs VOOG: 59% overlap
iShares Core S&P Total U.S. Stock Market ETF and Vanguard S&P 500 Growth ETF share 58.6% 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
ITOT and VOOG hold 148 of the same securities. The ten contributing most to the overlap figure:
| Holding | in ITOT | in VOOG | Δ |
|---|---|---|---|
| NVDA | 7.0% | 13.7% | 6.6% |
| AAPL | 6.6% | 6.0% | 0.6% |
| MSFT | 3.9% | 7.8% | 3.9% |
| AMZN | 3.2% | 3.5% | 0.3% |
| GOOGL | 2.6% | 5.9% | 3.3% |
| AVGO | 2.6% | 5.0% | 2.5% |
| GOOG | 2.1% | 4.7% | 2.6% |
| META | 1.8% | 3.5% | 1.6% |
| MU | 1.6% | 3.7% | 2.1% |
| LLY | 1.3% | 2.7% | 1.4% |
Where ITOT and VOOG 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 | ITOT | VOOG | Δ |
|---|---|---|---|
| Information Technology | 35.2% | 52.2% | −17.1pp |
| Communication Services | 8.7% | 15.2% | −6.5pp |
| Financials | 12.7% | 8.5% | +4.1pp |
| Health Care | 9.7% | 6.2% | +3.6pp |
| Energy | 3.5% | 0.0% | +3.5pp |
| Consumer Staples | 4.4% | 1.1% | +3.3pp |
| Industrials | 10.1% | 6.9% | +3.3pp |
| Utilities | 2.2% | 0.4% | +1.9pp |
Δ is ITOT minus VOOG, 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
40.5% of ITOT by weight, held in no part of VOOG.
0.0% of VOOG by weight, held in no part of ITOT.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| ITOT | VOOG | |
|---|---|---|
| Top 10 holdings | 32.7% | 56.4% |
| Positions held | 2,440 | 148 |
| Cost per $10,000 held, per year | $3 | $7 |
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 ITOT and VOOG overlap?
ITOT and VOOG overlap 58.6% by portfolio weight — substantial duplication if you hold both. They share 148 holdings. The figure comes from current issuer holdings files (ITOT as of 2026-07-23, VOOG as of 2026-06-30).
How is the overlap between ITOT and VOOG calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If ITOT holds a stock at 6% and VOOG 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 ITOT and VOOG?
That depends on your goals — we state facts, not advice. At 58.6% overlap, each fund still contributes meaningfully distinct exposure.
What does ITOT own that VOOG doesn't?
ITOT holds 2,440 positions and VOOG holds 148; 2,291 of ITOT's positions don't appear in VOOG at all, and they are 40.5% of ITOT by weight.
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Related comparisons
Sources: issuer holdings files, ITOT as of 2026-07-23, VOOG as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.