MGK vs VOOG: 73% overlap
Vanguard Mega Cap Growth ETF and Vanguard S&P 500 Growth ETF share 72.9% 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 1.3. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
MGK and VOOG hold 48 of the same securities. The ten contributing most to the overlap figure:
| Holding | in MGK | in VOOG | Δ |
|---|---|---|---|
| NVDA | 13.2% | 13.7% | 0.4% |
| MSFT | 7.5% | 7.8% | 0.3% |
| AAPL | 12.1% | 6.0% | 6.1% |
| GOOGL | 5.9% | 5.9% | 0.0% |
| GOOG | 4.6% | 4.7% | 0.1% |
| AVGO | 4.3% | 5.0% | 0.8% |
| META | 4.1% | 3.5% | 0.6% |
| AMZN | 4.4% | 3.5% | 1.0% |
| LLY | 3.4% | 2.7% | 0.7% |
| AMD | 3.2% | 2.7% | 0.5% |
Where MGK and VOOG 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 | MGK | VOOG | Δ |
|---|---|---|---|
| Information Technology | 58.6% | 52.2% | +6.4pp |
| Financials | 4.0% | 8.5% | −4.6pp |
| Industrials | 2.6% | 6.9% | −4.3pp |
| Consumer Discretionary | 11.2% | 8.5% | +2.7pp |
| Health Care | 4.9% | 6.2% | −1.3pp |
| Communication Services | 16.2% | 15.2% | +1.0pp |
| Consumer Staples | 0.4% | 1.1% | −0.7pp |
| Real Estate | 1.2% | 0.6% | +0.6pp |
Δ is MGK minus VOOG, 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
4.7% of MGK by weight, held in no part of VOOG.
25.0% of VOOG by weight, held in no part of MGK.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| MGK | VOOG | |
|---|---|---|
| Top 10 holdings | 63.5% | 56.4% |
| Positions held | 57 | 148 |
| Cost per $10,000 held, per year | $5 | $7 |
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 MGK and VOOG overlap?
MGK and VOOG overlap 72.9% by portfolio weight — substantial duplication if you hold both. They share 48 holdings. The figure comes from current issuer holdings files (MGK as of 2026-06-30, VOOG as of 2026-06-30).
How is the overlap between MGK and VOOG calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If MGK holds a stock at 6% and VOOG 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 MGK and VOOG?
That depends on your goals — we state facts, not advice. At 72.9% overlap, most of what one fund holds, the other holds too. Expense ratios: MGK 0.05% versus VOOG 0.07%.
What does MGK own that VOOG doesn't?
MGK holds 57 positions and VOOG holds 148; 9 of MGK's positions don't appear in VOOG at all, and they are 4.7% of MGK by weight.
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Related comparisons
Sources: issuer holdings files, MGK as of 2026-06-30, VOOG as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.