Iran Conflict Puts the Emerging-Markets Revival to the Test

The war in Iran has dealt a blow to one of Wall Street’s favorite trades — emerging markets.

Stocks and currencies have seen steep losses, with the MSCI equity index posting its biggest weekly drop in six years, and bond yields have jumped. Even so, money managers at firms including Pacific Investment Management Co., Barings LLC and T. Rowe Price Group Inc. argue the longer-term case for emerging markets remains intact. While some are tweaking portfolios at the margins, most are holding off on major shifts for now.

Their conviction rests on what investors see as the main drivers behind the emerging-markets rally: a push to diversify from US assets, attractive valuations and solid economic growth. Many believe those themes will reassert themselves once the geopolitical shock fades, and fund flows suggest investors are taking advantage of the dip in prices to buy more securities. Investors added $12.6 billion to emerging-market stocks and bonds in the week through Wednesday, according to a Bank of America Corp. report, citing EPFR Global data.