Three ETFs dominate the emerging markets allocation decision for US investors: the iShares MSCI Emerging Markets ETF (EEM), the iShares Core MSCI Emerging Markets ETF (IEMG), and the Vanguard FTSE Emerging Markets ETF (VWO). Together they hold over $200 billion in assets and serve as the primary vehicle through which institutional and retail capital accesses developing economies spanning Asia, Latin America, Eastern Europe, Africa and the Middle East.
The three funds are not interchangeable. EEM and IEMG both track MSCI indexes but differ materially in cost, breadth, and capital efficiency. VWO tracks the FTSE Emerging Markets index — a different benchmark with different country classifications and small-cap inclusion rules. In 2026, with the Iran ceasefire reshaping EM equity performance and the MSCI Emerging Markets index up +10.69% YTD (EEM) and +10.46% YTD (IEMG) through April 10, the choice between these three funds carries measurable financial consequences.
Key Facts Compariso
n
| Metric | EEM | IEMG | VWO |
|---|---|---|---|
| Full Name | iShares MSCI Emerging Markets ETF | iShares Core MSCI EM ETF | Vanguard FTSE Emerging Markets ETF |
| Benchmark | MSCI EM Index | MSCI EM Investable Market Index | FTSE Emerging Markets All Cap China A Inclusion Index |
| AUM | $26.86B | $144.47B | ~$90B |
| Expense Ratio | 0.72% | 0.09% | 0.08% |
| Holdings | 1,250 | 2,694 | ~6,500 |
| YTD Return (Apr 10) | +10.69% | +10.46% | [DATA UNAVAILABLE] |
| Inception | 2003 | 2012 | 2005 |
| South Korea included | ✅ Yes | ✅ Yes | ❌ No |
| Small caps included | ❌ No | ✅ Yes | ✅ Yes |
AUM and performance data from CountryETFTracker as of April 13, 2026. VWO AUM is approximate.
Performance Comparison: EEM vs IEMG
Country ETF Tracker
- EEM
- IEMG
Trade on eToro – the easy-to-use investing app with 7000+ assets.
Your capital is at risk.
Other fees apply.
The Cost Case: Why EEM Is Losing Asset
s
EEM charges 0.72% per year in expense ratio — eight times higher than IEMG (0.09%) and nine times higher than VWO (0.08%). On a $100,000 allocation over 10 years, assuming identical gross returns, EEM costs approximately $6,300 more in cumulative fees than IEMG.
This cost differential explains the dramatic AUM divergence. EEM launched in 2003 as the dominant EM vehicle and accumulated assets when no cheaper alternative existed. When iShares launched IEMG in 2012 at 0.18% (later reduced to 0.09%), institutional capital began migrating. IEMG now holds $144.47 billion — more than five times EEM's $26.86 billion — despite being a decade younger.
EEM retains its AUM largely through institutional inertia and its deep options market. EEM options are among the most liquid in the global ETF universe, with open interest routinely exceeding $50 billion notional. Hedge funds and institutional investors using EM options for hedging or structured products often maintain EEM positions specifically to trade against the liquid options chain. For pure long-only exposure, IEMG or VWO are the cost-rational alternatives.
The Index Difference: MSCI vs FTS
E
The most consequential structural difference between these three funds is the benchmark — specifically, whether South Korea is classified as an emerging or developed market.
MSCI classifies South Korea as an Emerging Market. EEM and IEMG both include Korean equities. As of April 2026, Samsung Electronics and SK Hynix — South Korea's two largest stocks — are top holdings in both EEM and IEMG, with TSMC (Taiwan) the largest single holding in each.
FTSE classifies South Korea as a Developed Market. VWO excludes Korean equities entirely. This creates a meaningful performance divergence in years when Korea outperforms or underperforms significantly.
In 2026, this is the most important single structural difference between the three funds. The iShares MSCI South Korea ETF (EWY) is +42.70% YTD through April 10 — by far the best-performing single country in the universe. EEM and IEMG, which hold Samsung and SK Hynix, capture this outperformance. VWO, which excludes Korea, does not. The YTD divergence between IEMG (+10.46%) and VWO's expected return is partially explained by this Korea exposure difference.
Holdings Structure: Breadth and Small Cap
s
EEM holds approximately 1,250 securities — large and mid-cap companies from the 24 MSCI Emerging Market countries. It excludes small-cap stocks.
IEMG holds approximately 2,694 securities — large, mid and small-cap companies across the same 24 MSCI EM countries. The Investable Market Index (IMI) adds small-cap exposure not present in EEM. For investors seeking comprehensive EM exposure including smaller domestic-oriented companies, IEMG provides broader coverage.
VWO holds approximately 6,500 securities spanning large, mid and small caps across the FTSE EM universe, which includes 23 countries (excluding Korea). The FTSE index includes China A-shares and has its own methodology for float adjustment and minimum liquidity standards.
The practical performance difference from holdings breadth is modest in most years — large-caps dominate both the MSCI and FTSE indexes by weight — but becomes meaningful in years where EM small caps significantly outperform or underperform large caps.
Top Country Weights (Approximate
)
| Country | EEM | IEMG | VWO |
|---|---|---|---|
| China | ~27% | ~27% | ~30% |
| Taiwan | ~18% | ~18% | ~21% |
| India | ~19% | ~19% | ~21% |
| South Korea | ~12% | ~12% | 0% ← Key difference |
| Brazil | ~5% | ~5% | ~6% |
| Saudi Arabia | ~4% | ~4% | ~4% |
2026 Performance Contex
t
The Iran war (February 27 – April 7) and subsequent ceasefire created significant dispersion within emerging markets. Countries with direct Hormuz exposure (UAE, Qatar, Saudi Arabia) diverged from energy importers (South Korea, India, Indonesia) and commodity exporters (Brazil, Colombia).
As of April 10, 2026:
- EEM: +10.69% YTD — benefiting from Korea (+42.70%) and Taiwan (+21.11%) weight
- IEMG: +10.46% YTD — similar composition to EEM, slightly lower due to small-cap drag
- MSCI EM forward P/E: 11.52x — a 32.7% discount to the MSCI ACWI at 17.12x
The deep valuation discount of EM equities (11.52x vs 17.12x for ACWI) reflects both structural risk premiums (political risk, currency risk, governance) and the 2026 war-period repricing. The post-ceasefire recovery in the broadest EM indexes is consistent with this valuation floor providing support.
Macro context: Prediction markets on Polymarket price a US recession by end-2026 at 32.5% and a Fed rate hike in 2026 at 15.5% — both declining probabilities that reduce the headwinds for EM equities from dollar strength and risk-off scenarios.
Which Fund to Choose
?
Choose IEMG if:
- Minimising cost is the primary objective (0.09% vs 0.72% for EEM)
- South Korea exposure is desired
- Small-cap EM coverage is valued
- Long-only portfolio without options strategies
Choose VWO if:
- Cost minimisation is paramount (0.08%)
- Korea exposure is undesired (FTSE classification)
- Broader small-cap coverage across a slightly different country set
- Vanguard's tax efficiency through in-kind redemptions is valued
Choose EEM if:
- Trading against the liquid EEM options chain for hedging or structured exposure
- Institutional mandate specifies the MSCI EM benchmark with large/mid-cap only
- Short-term trading where deep bid-ask spreads and options liquidity matter
For most long-only investors allocating to emerging markets in 2026, IEMG at 0.09% is the structurally superior choice versus EEM at 0.72%. The performance difference between IEMG and VWO depends primarily on the Korea exposure call — in 2026 specifically, IEMG's Korea inclusion has been a significant performance advantage.
Track live EM country ETF performance at countryetftracker.com. Full valuation data at countryetftracker.com/valuation.
Frequently Asked Question
s
What is the main difference between EEM and IEMG?
EEM and IEMG both track MSCI Emerging Markets indexes, but IEMG uses the MSCI EM Investable Market Index (which includes small caps) while EEM uses the standard MSCI EM Index (large and mid-cap only). IEMG holds 2,694 securities versus EEM's 1,250. Most importantly, IEMG charges 0.09% versus EEM's 0.72% — making IEMG the cost-rational choice for long-only investors.
Why does VWO not include South Korea?
VWO tracks the FTSE Emerging Markets index, which classifies South Korea as a Developed Market (not Emerging). MSCI, which EEM and IEMG track, classifies South Korea as Emerging. This classification difference means VWO excludes Samsung Electronics and SK Hynix — the two largest Korean stocks — while EEM and IEMG include them.
Is EEM still worth holding in 2026?
For long-only investors, EEM's 0.72% expense ratio is difficult to justify when IEMG offers near-identical MSCI EM exposure at 0.09%. EEM retains value for investors who actively trade its options chain, which is among the most liquid in global ETF markets. As a buy-and-hold allocation vehicle, the fee drag compounds materially over multi-year periods.
How has the Iran war affected EEM and IEMG in 2026?
Both funds are +10-11% YTD through April 10 — outperforming SPY (-0.36%) significantly. The performance is driven primarily by South Korea (+42.70% YTD in EWY) and Taiwan (+21.11% YTD in EWT), both large MSCI EM weights. These two markets benefited from the AI semiconductor cycle pre-war and partially recovered post-ceasefire from their war-period declines.