IWD vs MGK: 19% overlap
iShares Russell 1000 Value ETF and Vanguard Mega Cap Growth ETF share 19.2% 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 1.8. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
IWD and MGK hold 22 of the same securities. The ten contributing most to the overlap figure:
| Holding | in IWD | in MGK | Δ |
|---|---|---|---|
| AAPL | 5.9% | 12.1% | 6.2% |
| AMZN | 5.7% | 4.4% | 1.3% |
| MSFT | 3.9% | 7.5% | 3.6% |
| INTC | 1.2% | 1.1% | 0.1% |
| META | 0.7% | 4.1% | 3.4% |
| WELL | 0.5% | 0.7% | 0.2% |
| UBER | 0.3% | 0.4% | 0.1% |
| VRTX | 0.3% | 0.6% | 0.3% |
| EQIX | 0.3% | 0.5% | 0.2% |
| TJX | 0.3% | 0.7% | 0.4% |
Where IWD 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 | IWD | MGK | Δ |
|---|---|---|---|
| Information Technology | 18.0% | 58.6% | −40.6pp |
| Financials | 19.6% | 4.0% | +15.6pp |
| Communication Services | 3.3% | 16.2% | −12.9pp |
| Industrials | 11.3% | 2.6% | +8.7pp |
| Health Care | 12.7% | 4.9% | +7.8pp |
| Consumer Staples | 7.4% | 0.4% | +7.0pp |
| Energy | 6.1% | 0.0% | +6.1pp |
| Utilities | 3.9% | 0.0% | +3.9pp |
Δ is IWD 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
79.4% of IWD by weight, held in no part of MGK.
62.8% of MGK by weight, held in no part of IWD.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| IWD | MGK | |
|---|---|---|
| Top 10 holdings | 27.8% | 63.5% |
| Positions held | 872 | 57 |
| Cost per $10,000 held, per year | $19 | $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 IWD and MGK overlap?
IWD and MGK overlap 19.2% by portfolio weight — moderate overlap. They share 22 holdings. The figure comes from current issuer holdings files (IWD as of 2026-07-23, MGK as of 2026-06-30).
How is the overlap between IWD and MGK calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If IWD 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 IWD and MGK?
That depends on your goals — we state facts, not advice. At 19.2% overlap, each fund still contributes meaningfully distinct exposure.
What does IWD own that MGK doesn't?
IWD holds 872 positions and MGK holds 57; 849 of IWD's positions don't appear in MGK at all, and they are 79.4% of IWD by weight.
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Related comparisons
Sources: issuer holdings files, IWD as of 2026-07-23, MGK as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.