Markets cheer U.S.-Iran agreement, but some investors caution deal is yet to be signed

The American flag flies behind a Wall Street sign near the New York Stock Exchange (NYSE) in New York City on April 22, 2026. Angela Weiss | Afp | Getty Images Asian stocks rallied Monday while oil prices tumbled after the U.S. and Iran agreed to a peace deal aimed at ending nearly four months of conflict , prompting investors to unwind some of the geopolitical risk premium that has dominated markets since February. The strongest reaction was seen in energy markets. U.S. …