VIMAX vs VO: 100% overlap
Vanguard Mid-Cap Index Admiral and Vanguard Mid-Cap ETF share 100.0% 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
VIMAX and VO hold 283 of the same securities. The ten contributing most to the overlap figure:
| Holding | in VIMAX | in VO | Δ |
|---|---|---|---|
| VRT | 1.2% | 1.2% | 0.0% |
| WDC | 1.1% | 1.1% | 0.0% |
| STX | 1.0% | 1.0% | 0.0% |
| PWR | 1.0% | 1.0% | 0.0% |
| HWM | 1.0% | 1.0% | 0.0% |
| CMI | 1.0% | 1.0% | 0.0% |
| DDOG | 0.8% | 0.8% | 0.0% |
| BE | 0.8% | 0.8% | 0.0% |
| CEG | 0.8% | 0.8% | 0.0% |
| HOOD | 0.8% | 0.8% | 0.0% |
Where VIMAX and VO 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 | VIMAX | VO | Δ |
|---|---|---|---|
| Industrials | 19.6% | 19.6% | +0.0pp |
| Information Technology | 16.1% | 16.1% | +0.0pp |
| Utilities | 8.4% | 8.4% | +0.0pp |
| Financials | 14.0% | 14.0% | +0.0pp |
| Energy | 7.3% | 7.3% | +0.0pp |
| Consumer Discretionary | 8.9% | 8.9% | +0.0pp |
| Materials | 4.3% | 4.3% | +0.0pp |
| Real Estate | 5.1% | 5.1% | +0.0pp |
Δ is VIMAX minus VO, 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 VIMAX by weight, held in no part of VO.
0.0% of VO by weight, held in no part of VIMAX.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| VIMAX | VO | |
|---|---|---|
| Top 10 holdings | 9.5% | 9.5% |
| Positions held | 283 | 283 |
| Cost per $10,000 held, per year | $5 | $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 VIMAX and VO overlap?
VIMAX and VO overlap 100.0% by portfolio weight — they are effectively the same fund. They share 283 holdings. The figure comes from current issuer holdings files (VIMAX as of 2026-06-30, VO as of 2026-06-30).
How is the overlap between VIMAX and VO calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If VIMAX holds a stock at 6% and VO 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 VIMAX and VO?
That depends on your goals — we state facts, not advice. At 100.0% overlap, most of what one fund holds, the other holds too. Expense ratios: VIMAX 0.05% versus VO 0.03%.
What does VIMAX own that VO doesn't?
VIMAX holds 283 positions and VO holds 283; 0 of VIMAX's positions don't appear in VO at all, and they are 0.0% of VIMAX by weight.
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Related comparisons
Sources: issuer holdings files, VIMAX as of 2026-06-30, VO as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.