US containerized imports rose 6.6 percent in May to 2.43 million TEU, up 11.5 percent year on year, reflecting seasonal growth despite lingering geopolitical and trade risks, reported the American Journal of Transportation.

China-origin imports rebounded sharply to 816,197 TEU, marking a 19.9 percent monthly rise and a 28.1 percent increase year on year. China's share of US imports increased to 33.6 percent, although volumes remain 20.2 percent below the July 2024 peak. Gains were also recorded from India, Vietnam, and Hong Kong, while declines were noted from Thailand, Japan, and South Korea.

Eight of the top 10 US ports posted higher volumes in May. Savannah rose by 17 percent, New York/Newark by 10.8 percent, and Houston by 18.2 percent. Los Angeles and Tacoma were the only gateways to experience a decline. East and Gulf Coast ports captured 44.8 percent of total imports, while West Coast ports accounted for 45.1 percent.

Port delays remained stable, with congestion at Long Beach easing from 7.3 days in April to 2.2 days in May. Other ports saw only modest changes, suggesting overall stable operations. Gulf Coast imports climbed 14.8 percent to 257,564 TEU, marking the second-highest monthly volume on record.

Risks persist as the Strait of Hormuz remains effectively closed following renewed US-Iran tensions, disrupting global energy flows and raising freight costs. New US tariff proposals of 10 to 12.5 percent on imports from about 60 countries, including China, add further uncertainty.

The administration's appeal of a court order expanding eligibility for tariff refunds has also prolonged uncertainty for importers. Descartes stated that supply chain strategies will remain focused on flexibility, diversification, and risk mitigation throughout 2026.