IVV vs VOO: 96% overlap
iShares Core S&P 500 ETF and Vanguard S&P 500 ETF share 95.5% 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 1.0. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
IVV and VOO hold 501 of the same securities. The ten contributing most to the overlap figure:
| Holding | in IVV | in VOO | Δ |
|---|---|---|---|
| NVDA | 7.8% | 8.4% | 0.6% |
| AAPL | 7.7% | 7.4% | 0.3% |
| MSFT | 5.8% | 5.8% | 0.1% |
| AMZN | 3.7% | 3.7% | 0.0% |
| GOOGL | 2.9% | 3.1% | 0.2% |
| AVGO | 2.3% | 2.5% | 0.2% |
| GOOG | 2.3% | 2.5% | 0.1% |
| META | 2.2% | 2.4% | 0.3% |
| TSLA | 1.6% | 1.5% | 0.1% |
| MU | 1.5% | 1.8% | 0.4% |
Where IVV 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 | IVV | VOO | Δ |
|---|---|---|---|
| Information Technology | 37.5% | 39.7% | −2.2pp |
| Financials | 12.0% | 11.3% | +0.7pp |
| Health Care | 9.9% | 9.3% | +0.7pp |
| Communication Services | 9.2% | 9.8% | −0.6pp |
| Consumer Staples | 4.9% | 4.4% | +0.6pp |
| Consumer Discretionary | 8.9% | 8.6% | +0.3pp |
| Energy | 3.7% | 3.4% | +0.3pp |
| Cash and/or Derivatives | 0.2% | 0.1% | +0.2pp |
Δ is IVV 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
0.1% of IVV by weight, held in no part of VOO.
0.2% of VOO by weight, held in no part of IVV.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| IVV | VOO | |
|---|---|---|
| Top 10 holdings | 37.8% | 39.1% |
| Positions held | 506 | 504 |
| 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 IVV and VOO overlap?
IVV and VOO overlap 95.5% by portfolio weight — they are effectively the same fund. They share 501 holdings. The figure comes from current issuer holdings files (IVV as of 2026-10-22, VOO as of 2026-09-30).
How is the overlap between IVV and VOO calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If IVV 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 IVV and VOO?
That depends on your goals — we state facts, not advice. At 95.5% overlap, most of what one fund holds, the other holds too. Expense ratios: IVV 0.03% versus VOO 0.03%.
What does IVV own that VOO doesn't?
IVV holds 506 positions and VOO holds 504; 4 of IVV's positions don't appear in VOO at all, and they are 0.1% of IVV by weight.
You probably hold more than two funds
This page compares IVV and VOO. Paste your whole portfolio — brokerage, 401(k), IRA — and see the overlap across every fund at once, plus what you actually own underneath them and your own Effective Funds number. Free, no account, nothing stored.
X-ray my portfolio — free →Watch IVV vs VOO
We re-read both funds’ published holdings every weeknight. Leave an address and we'll tell you when what's inside actually changes.
Not sending yet — email alerts are built but switched off, and you'll be among the first when they turn on. No spam, one-click unsubscribe.
Related comparisons
Sources: issuer holdings files, IVV as of 2026-10-22, VOO as of 2026-09-30. Weights are fractions of each fund. Diagnostics, not advice.