VO vs VTWNX: 4% overlap
Vanguard Mid-Cap ETF and Vanguard Target Retirement 2020 share 4.0% 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 — VTWNX 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 2.0. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
VO and VTWNX hold 283 of the same securities. The ten contributing most to the overlap figure:
| Holding | in VO | in VTWNX | Δ |
|---|---|---|---|
| CASH | 0.5% | 1.7% | 1.2% |
| ROP | 0.3% | 0.1% | 0.2% |
| WDC | 1.1% | 0.1% | 1.0% |
| STX | 1.0% | 0.1% | 1.0% |
| DTE | 0.3% | 0.0% | 0.2% |
| VRT | 1.2% | 0.0% | 1.2% |
| PWR | 1.0% | 0.0% | 1.0% |
| HWM | 1.0% | 0.0% | 1.0% |
| DG | 0.2% | 0.0% | 0.2% |
| NEM | 0.5% | 0.0% | 0.5% |
Where VO and VTWNX 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 | VO | VTWNX | Δ |
|---|---|---|---|
| Unclassified | 0.4% | 29.8% | −29.3pp |
| Treasuries | 0.0% | 17.1% | −17.1pp |
| Industrials | 19.6% | 4.0% | +15.6pp |
| MBS Pass-Through | 0.0% | 7.2% | −7.2pp |
| Utilities | 8.4% | 1.8% | +6.5pp |
| Energy | 7.3% | 1.1% | +6.2pp |
| Information Technology | 16.1% | 10.0% | +6.1pp |
| Consumer Discretionary | 8.9% | 2.9% | +6.0pp |
Δ is VO minus VTWNX, 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
0.0% of VO by weight, held in no part of VTWNX.
94.7% of VTWNX by weight, held in no part of VO.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| VO | VTWNX | |
|---|---|---|
| Top 10 holdings | 9.5% | 44.9% |
| Positions held | 283 | 7 |
| 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 VO and VTWNX overlap?
VO and VTWNX overlap 4.0% by portfolio weight — largely distinct portfolios. They share 283 holdings. The figure comes from current issuer holdings files (VO as of 2026-06-30, VTWNX as of 2026-03-31).
How is the overlap between VO and VTWNX calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If VO holds a stock at 6% and VTWNX 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 VO and VTWNX?
That depends on your goals — we state facts, not advice. At 4.0% overlap, each fund still contributes meaningfully distinct exposure.
What does VO own that VTWNX doesn't?
VO holds 283 positions and VTWNX holds 7; 0 of VO's positions don't appear in VTWNX at all, and they are 0.0% of VO by weight.
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Related comparisons
Sources: issuer holdings files, VO as of 2026-06-30, VTWNX as of 2026-03-31. Weights are fractions of each fund. Diagnostics, not advice.