iShares Core MSCI Emerging Markets ETF (IEMG)

The iShares Core MSCI Emerging Markets ETF, ticker IEMG, is the broadest and most accessible entry point for US investors into emerging-market equities. It holds roughly two thousand stocks across roughly two dozen countries in Latin America, Asia, the Middle East, and Africa — places where GDP growth rates are higher than in developed economies but where political risk, currency volatility, and weaker institutions are structural realities.

Emerging markets: the concept and its evolution

The term “emerging markets” was coined in the 1980s to describe economies transitioning from poverty toward middle-income status, with rising education, improving institutions, and gradual integration into global finance. As these markets opened their stock exchanges to foreign capital, Western investors discovered a pool of companies growing faster than their mature-market counterparts, trading at cheaper valuations, and offering diversification from US and developed-world equities.

The MSCI Emerging Markets index, which IEMG tracks, is a living history of that concept. It began in the 1980s with a handful of countries (Mexico, Brazil, South Korea, Taiwan); it has expanded to include roughly two dozen nations as their capital markets deepened. Today it is dominated by China and India by population and economic scale, but also includes Mexico, Brazil, South Korea, Taiwan, Thailand, Malaysia, the Philippines, Indonesia, and Poland among others. The index adjusts for liquidity and currency convertibility, excluding countries where capital controls or political instability make markets inaccessible to foreign investors.

A geographically weighted history

China is the single largest holding in IEMG, a position that reflects both China’s vast economy and the fact that many of the index’s early years predated China’s market opening in the early 1990s. When China joined, its weight rose steadily as Chinese companies became available to foreign investors. By the early 2000s, China was perhaps a quarter of the index; by the 2010s, closer to a third. That concentration gives IEMG substantial exposure to Chinese policy, regulation, and growth — arguably too much for comfort, from the perspective of diversification.

India’s weight has risen over the past decade as the Indian market has grown and as capital has rotated toward a country with fewer geopolitical tensions than China and faster long-term demographic tailwinds. Brazil, a giant by land and resource wealth, has long been volatile, prone to currency crises and boom-bust commodity cycles. Mexico has grown in importance as a manufacturing base for US firms and a recipient of US capital and supply-chain reorientation.

Higher growth, higher volatility

The appeal of emerging markets is higher long-term growth. These are countries adding electricity to villages, building roads, and training millions of new workers — economic tailwinds that can power earnings growth for years. A company in an emerging market may grow faster than a mature-market counterpart, offering investors a chance to own growth at a reasonable price before the country reaches middle-income stability.

The reality is more complicated. First, higher growth rarely translates to higher returns for investors. Many high-growth economies saw their stock markets crater during bear markets and during currency crises. The returns on emerging-market equities over long periods have not been dramatically higher than developed-market returns, despite the growth differential. Second, the volatility is real: currency fluctuations, political instability, sudden reversals in capital flows, and commodity shocks all hit emerging markets harder than developed markets. A holder of IEMG must be comfortable with drawdowns that can stretch 40–50% or more during global risk-off episodes.

Third, emerging markets are not uniform. India’s economy, institutions, and demographics point to a very different future than Turkey’s or Egypt’s. Brazil’s fortunes depend on commodity prices in ways Japan’s do not. IEMG, by holding all of them in a single index, obscures these distinctions and requires the holder to trust that index weighting and rules-based selection will construct a sensible portfolio. Sometimes it does; sometimes it concentrates too much in a single country (as it has with China) or a single commodity (when energy prices dominate).

The rise and the questions

IEMG was born in the early 2000s, a period when emerging markets were gaining acceptance among institutions and wealthy individuals. The 2008 financial crisis triggered a flight from emerging markets, but in the following decade, quantitative easing in developed economies sent capital chasing higher returns into emerging markets, driving strong IEMG returns. The index became a core holding for diversification-minded investors.

More recently, the attractiveness has become more contested. Rising interest rates in the US have made dollar-denominated returns from developed economies more competitive. China’s slowing growth and its turn toward state intervention have prompted some investors to reduce their emerging-market allocation. The geopolitical tension between the US and China, the fragmentation of global supply chains, and the shift toward near-shoring (moving manufacturing closer to the US or Europe) have all reduced the structural momentum that once powered emerging-market enthusiasm.

How to research it

The fund’s factsheet discloses country weights, sector composition, and top holdings. Understanding that composition is critical — a holder of IEMG in 2005 had a very different bet than a holder in 2025. China’s weight, India’s trajectory, and Brazil’s commodity dependence each matter. Compare IEMG’s performance in bull markets versus bear markets, and versus a developed-market index, to understand the diversification value and the volatility cost. Watch Chinese regulatory news, Indian interest rates, and Brazilian currency trends — these shape IEMG’s returns far more than any internal attribute of the fund itself. And be honest about your tolerance for the drawdowns that emerge-market exposure entails; IEMG’s simplicity and low cost make it easy to own, but its volatility makes it demanding to hold through stress.