IVW vs MGK: 72% overlap
iShares S&P 500 Growth ETF and Vanguard Mega Cap Growth ETF share 71.6% 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
IVW and MGK hold 48 of the same securities. The ten contributing most to the overlap figure:
| Holding | in IVW | in MGK | Δ |
|---|---|---|---|
| NVDA | 14.7% | 13.2% | 1.4% |
| MSFT | 8.2% | 7.5% | 0.7% |
| AAPL | 6.9% | 12.1% | 5.3% |
| GOOGL | 5.4% | 5.9% | 0.5% |
| GOOG | 4.4% | 4.6% | 0.3% |
| AVGO | 5.4% | 4.3% | 1.1% |
| META | 3.9% | 4.1% | 0.2% |
| AMZN | 3.5% | 4.4% | 0.9% |
| LLY | 2.7% | 3.4% | 0.7% |
| AMD | 2.6% | 3.2% | 0.6% |
Where IVW and MGK 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 | IVW | MGK | Δ |
|---|---|---|---|
| Information Technology | 52.5% | 58.6% | −6.1pp |
| Financials | 9.2% | 4.0% | +5.2pp |
| Industrials | 6.6% | 2.6% | +4.0pp |
| Consumer Discretionary | 8.0% | 11.2% | −3.2pp |
| Communication Services | 14.7% | 16.2% | −1.5pp |
| Health Care | 6.3% | 4.9% | +1.4pp |
| Consumer Staples | 1.2% | 0.4% | +0.8pp |
| Real Estate | 0.7% | 1.2% | −0.5pp |
Δ is IVW minus MGK, 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
25.0% of IVW by weight, held in no part of MGK.
4.7% of MGK by weight, held in no part of IVW.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| IVW | MGK | |
|---|---|---|
| Top 10 holdings | 58.2% | 63.5% |
| Positions held | 149 | 57 |
| Cost per $10,000 held, per year | $18 | $5 |
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 IVW and MGK overlap?
IVW and MGK overlap 71.6% by portfolio weight — substantial duplication if you hold both. They share 48 holdings. The figure comes from current issuer holdings files (IVW as of 2026-07-23, MGK as of 2026-06-30).
How is the overlap between IVW and MGK calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If IVW holds a stock at 6% and MGK 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 IVW and MGK?
That depends on your goals — we state facts, not advice. At 71.6% overlap, most of what one fund holds, the other holds too. Expense ratios: IVW 0.18% versus MGK 0.05%.
What does IVW own that MGK doesn't?
IVW holds 149 positions and MGK holds 57; 100 of IVW's positions don't appear in MGK at all, and they are 25.0% of IVW by weight.
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Related comparisons
Sources: issuer holdings files, IVW as of 2026-07-23, MGK as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.