ITOT vs VB: 12% overlap
iShares Core S&P Total U.S. Stock Market ETF and Vanguard Small-Cap ETF share 11.9% 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 1.9. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
ITOT and VB hold 1,275 of the same securities. The ten contributing most to the overlap figure:
| Holding | in ITOT | in VB | Δ |
|---|---|---|---|
| CASH | 0.2% | 1.7% | 1.5% |
| FLEX | 0.1% | 0.4% | 0.3% |
| ALAB | 0.1% | 0.4% | 0.4% |
| CRDO | 0.1% | 0.5% | 0.5% |
| NTRA | 0.1% | 0.4% | 0.4% |
| RVMD | 0.1% | 0.5% | 0.4% |
| EME | 0.0% | 0.4% | 0.4% |
| JBL | 0.0% | 0.5% | 0.4% |
| EQT | 0.0% | 0.2% | 0.2% |
| STLD | 0.0% | 0.2% | 0.1% |
Where ITOT and VB 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 | VB | Δ |
|---|---|---|---|
| Information Technology | 35.2% | 16.1% | +19.1pp |
| Industrials | 10.1% | 21.0% | −10.9pp |
| Communication Services | 8.7% | 3.0% | +5.7pp |
| Real Estate | 2.3% | 7.1% | −4.8pp |
| Materials | 2.1% | 5.3% | −3.2pp |
| Health Care | 9.7% | 11.9% | −2.2pp |
| Cash and/or Derivatives | 0.2% | 1.7% | −1.5pp |
| Consumer Discretionary | 8.8% | 9.9% | −1.1pp |
Δ is ITOT minus VB, 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
88.1% of ITOT by weight, held in no part of VB.
0.9% of VB 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 | VB | |
|---|---|---|
| Top 10 holdings | 32.7% | 5.6% |
| Positions held | 2,440 | 1,308 |
| Cost per $10,000 held, per year | $3 | $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 ITOT and VB overlap?
ITOT and VB overlap 11.9% by portfolio weight — largely distinct portfolios. They share 1,275 holdings. The figure comes from current issuer holdings files (ITOT as of 2026-07-23, VB as of 2026-06-30).
How is the overlap between ITOT and VB 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 VB 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 VB?
That depends on your goals — we state facts, not advice. At 11.9% overlap, each fund still contributes meaningfully distinct exposure.
What does ITOT own that VB doesn't?
ITOT holds 2,440 positions and VB holds 1,308; 1,164 of ITOT's positions don't appear in VB at all, and they are 88.1% of ITOT by weight.
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Related comparisons
Sources: issuer holdings files, ITOT as of 2026-07-23, VB as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.