The U.S. dollar sank by 1.8% against a basket of major currencies in early March 2026, its steepest single-month decline since February, following reports of renewed diplomatic outreach between the United States and Iran. The move reversed recent safe-haven demand and triggered broad shifts in energy and defense markets.
- Dollar dropped 1.8% against DXY in March 2026—largest monthly decline since February
- Crude oil (CL=F) rose 3.4% to $89.60/bbl on reduced supply risk concerns
- Energy ETF (XLE) gained 2.9% on easing regional tensions
- Defense stocks (LMT, RTX) declined 1.7%–2.3% amid reduced spending expectations
- Euro and yen rose over 2% against the dollar in early March
- U.S. 10-year yield fell to 4.11% as risk appetite improved
The U.S. dollar weakened sharply on March 4, 2026, falling 1.8% against the DXY index, marking its largest monthly drop since February. The decline followed unconfirmed reports of backchannel talks between U.S. and Iranian officials aimed at de-escalating regional tensions, particularly over nuclear activities and maritime security in the Strait of Hormuz. This development fueled a rapid shift in investor sentiment from caution to risk-on positioning. The move was particularly pronounced against the euro and yen, both of which rose over 2% against the dollar in early trading, reflecting a broad-based flight from the greenback. Meanwhile, the U.S. 10-year Treasury yield dropped to 4.11%, its lowest level since early January, as investors priced in lower long-term risk premiums. The energy sector reacted strongly: crude oil futures (CL=F) surged 3.4% to $89.60 per barrel, while the energy sector ETF (XLE) climbed 2.9% in a single session, signaling reduced fears of supply disruption. Defense stocks, which had gained momentum in late 2025 amid ongoing Middle East tensions, reversed course. Shares in Lockheed Martin (LMT) and Raytheon Technologies (RTX) fell 1.7% and 2.3%, respectively, as market participants priced in a potential reduction in defense spending if diplomatic progress with Iran leads to a broader regional easing. The U.S. dollar’s drop also impacted emerging market currencies, with the Mexican peso (MXN) and Indian rupee (INR) gaining 1.5% and 1.2% against the dollar. The reversal underscores the dollar’s sensitivity to geopolitical risk. With the Federal Reserve maintaining a hawkish stance and inflation data still sticky in early 2026, the currency’s sharp decline suggests that global risk sentiment has now outweighed monetary policy expectations. Market participants are now closely monitoring any official confirmation of the Iran outreach, which could further influence capital flows, commodity prices, and sector valuations in the coming weeks.