IEFA vs MGK: 0% overlap
iShares Core MSCI EAFE ETF and Vanguard Mega Cap Growth ETF share 0.0% 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 2.0. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
IEFA and MGK hold 1 of the same securities. The ten contributing most to the overlap figure:
| Holding | in IEFA | in MGK | Δ |
|---|---|---|---|
| CASH | 0.0% | 0.5% | 0.5% |
Where IEFA 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 | IEFA | MGK | Δ |
|---|---|---|---|
| Information Technology | 11.9% | 58.6% | −46.7pp |
| Financials | 24.2% | 4.0% | +20.2pp |
| Industrials | 19.6% | 2.6% | +17.0pp |
| Communication Services | 3.2% | 16.2% | −13.0pp |
| Consumer Staples | 6.7% | 0.4% | +6.3pp |
| Materials | 6.4% | 0.4% | +6.0pp |
| Utilities | 4.2% | 0.0% | +4.2pp |
| Energy | 3.9% | 0.0% | +3.9pp |
Δ is IEFA 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
99.5% of IEFA by weight, held in no part of MGK.
99.5% of MGK by weight, held in no part of IEFA.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| IEFA | MGK | |
|---|---|---|
| Top 10 holdings | 12.5% | 63.5% |
| Positions held | 2,567 | 57 |
| Cost per $10,000 held, per year | $7 | $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 IEFA and MGK overlap?
IEFA and MGK overlap 0.0% by portfolio weight — largely distinct portfolios. They share 1 holdings. The figure comes from current issuer holdings files (IEFA as of 2026-07-23, MGK as of 2026-06-30).
How is the overlap between IEFA and MGK calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If IEFA 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 IEFA and MGK?
That depends on your goals — we state facts, not advice. At 0.0% overlap, each fund still contributes meaningfully distinct exposure.
What does IEFA own that MGK doesn't?
IEFA holds 2,567 positions and MGK holds 57; 2,565 of IEFA's positions don't appear in MGK at all, and they are 99.5% of IEFA by weight.
You probably hold more than two funds
This page compares IEFA and MGK. Paste your whole portfolio — brokerage, 401(k), IRA — and see the overlap across every fund at once, plus what you actually own underneath them and your own Effective Funds number. Free, no account, nothing stored.
X-ray my portfolio — free →Watch IEFA vs MGK
We re-read both funds’ published holdings every weeknight. Leave an address and we'll tell you when what's inside actually changes.
Not sending yet — email alerts are built but switched off, and you'll be among the first when they turn on. No spam, one-click unsubscribe.
Related comparisons
Sources: issuer holdings files, IEFA as of 2026-07-23, MGK as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.