VOO vs VTTSX: 47% overlap
Vanguard S&P 500 ETF and Vanguard Target Retirement 2060 share 46.8% of their portfolios by weight — computed as Σ min(wA, wB) over every holding both funds own.
Different holding dates. These holdings were published about 3 months apart — VTTSX as of 2026-03-31, the rest through 2026-06-30. Each fund is compared using its most recent file, so any trading in between shows up as a difference.
You would hold two tickers and get the diversification of 1.5. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
VOO and VTTSX hold 503 of the same securities. The ten contributing most to the overlap figure:
| Holding | in VOO | in VTTSX | Δ |
|---|---|---|---|
| NVDA | 7.5% | 3.3% | 4.2% |
| AAPL | 6.6% | 3.1% | 3.5% |
| MSFT | 4.3% | 2.0% | 2.3% |
| AMZN | 3.6% | 1.7% | 1.9% |
| GOOGL | 3.2% | 1.5% | 1.7% |
| AVGO | 2.8% | 1.3% | 1.5% |
| GOOG | 2.6% | 1.2% | 1.4% |
| MU | 2.0% | 0.9% | 1.1% |
| META | 1.9% | 0.9% | 1.0% |
| TSLA | 1.8% | 0.9% | 1.0% |
Where VOO and VTTSX 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 | VOO | VTTSX | Δ |
|---|---|---|---|
| Information Technology | 38.0% | 26.3% | +11.7pp |
| Unclassified | 0.0% | 6.1% | −6.1pp |
| Communication Services | 9.7% | 6.0% | +3.7pp |
| Treasuries | 0.0% | 3.3% | −3.3pp |
| Financials | 11.6% | 14.1% | −2.5pp |
| Health Care | 8.9% | 7.0% | +1.9pp |
| Cash and/or Derivatives | 0.2% | 2.0% | −1.8pp |
| Consumer Discretionary | 9.3% | 7.6% | +1.7pp |
Δ is VOO minus VTTSX, 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 VOO by weight, held in no part of VTTSX.
51.1% of VTTSX by weight, held in no part of VOO.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| VOO | VTTSX | |
|---|---|---|
| Top 10 holdings | 36.4% | 19.3% |
| Positions held | 505 | 6 |
| Cost per $10,000 held, per year | $3 | $8 |
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 VOO and VTTSX overlap?
VOO and VTTSX overlap 46.8% by portfolio weight — moderate overlap. They share 503 holdings. The figure comes from current issuer holdings files (VOO as of 2026-06-30, VTTSX as of 2026-03-31).
How is the overlap between VOO and VTTSX calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If VOO holds a stock at 6% and VTTSX 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 VOO and VTTSX?
That depends on your goals — we state facts, not advice. At 46.8% overlap, each fund still contributes meaningfully distinct exposure.
What does VOO own that VTTSX doesn't?
VOO holds 505 positions and VTTSX holds 6; 2 of VOO's positions don't appear in VTTSX at all, and they are 0.1% of VOO by weight.
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Related comparisons
Sources: issuer holdings files, VOO as of 2026-06-30, VTTSX as of 2026-03-31. Weights are fractions of each fund. Diagnostics, not advice.