IEMG vs SPY: 0% overlap
iShares Core MSCI Emerging Markets ETF and SPDR S&P 500 ETF Trust share 0.1% 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
IEMG and SPY hold 9 of the same securities. The ten contributing most to the overlap figure:
| Holding | in IEMG | in SPY | Δ |
|---|---|---|---|
| HAL | 0.1% | 0.0% | 0.0% |
| BDX | 0.0% | 0.1% | 0.0% |
| TEL | 0.0% | 0.1% | 0.1% |
| CCL | 0.0% | 0.1% | 0.0% |
| ECL | 0.0% | 0.1% | 0.1% |
| LULU | 0.0% | 0.0% | 0.0% |
| SRE | 0.0% | 0.1% | 0.1% |
| IEX | 0.0% | 0.0% | 0.0% |
| PTC | 0.0% | 0.0% | 0.0% |
Where IEMG and SPY 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 | IEMG | SPY | Δ |
|---|---|---|---|
| Health Care | 3.1% | 9.1% | −6.0pp |
| Financials | 18.1% | 12.4% | +5.7pp |
| Materials | 5.8% | 1.8% | +4.0pp |
| Communication Services | 5.4% | 9.3% | −3.9pp |
| Information Technology | 39.8% | 37.5% | +2.3pp |
| Consumer Staples | 3.0% | 4.6% | −1.6pp |
| Industrials | 7.7% | 8.9% | −1.1pp |
| Cash and/or Derivatives | 0.8% | 0.0% | +0.8pp |
Δ is IEMG minus SPY, 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
99.1% of IEMG by weight, held in no part of SPY.
99.4% of SPY by weight, held in no part of IEMG.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| IEMG | SPY | |
|---|---|---|
| Top 10 holdings | 33.6% | 36.9% |
| Positions held | 2,790 | 505 |
| Cost per $10,000 held, per year | $9 | $9 |
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 IEMG and SPY overlap?
IEMG and SPY overlap 0.1% by portfolio weight — largely distinct portfolios. They share 9 holdings. The figure comes from current issuer holdings files (IEMG as of 2026-07-23, SPY as of 2026-07-23).
How is the overlap between IEMG and SPY calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If IEMG holds a stock at 6% and SPY 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 IEMG and SPY?
That depends on your goals — we state facts, not advice. At 0.1% overlap, each fund still contributes meaningfully distinct exposure.
What does IEMG own that SPY doesn't?
IEMG holds 2,790 positions and SPY holds 505; 2,780 of IEMG's positions don't appear in SPY at all, and they are 99.1% of IEMG by weight.
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Related comparisons
Sources: issuer holdings files, IEMG as of 2026-07-23, SPY as of 2026-07-23. Weights are fractions of each fund. Diagnostics, not advice.