U.S. trade deficit widens to over one-year high: global supply chain hoarding effect driven by tariff expectations and AI demand

Behind the Trade Data: A Mirror of Corporate Stockpiling and Policy Games

In May 2025, the U.S. trade deficit widened by 42.2% month-over-month to $77.7 billion, the highest level in over a year. Imports rose 3.3% to $395.3 billion, while exports fell 3.2% to $317.7 billion. The surface numbers reflect short-term fluctuations, but a deeper dive reveals that global supply chains are undergoing a structural adjustment driven by tariff expectations, technology investments, and geopolitical factors.

The Tariff Window: The Logic of "Front-Running" in Pharmaceutical Imports

Oxford Economics economist Grace Zwemmer noted that about half of the import growth in May came from pharmaceutical preparations. This is not a sudden surge in demand, but rather companies anticipating a 100% tariff on imported pharmaceuticals set to take effect on July 31, leading to large-scale early stockpiling within the window period. Although the policy includes multiple exemption clauses, uncertainty is enough to prompt supply chain managers to move inventory forward. This behavior has become the norm in recent years—every time the Trump administration threatens new tariffs, U.S. import data spikes, only to recede after the tariffs are implemented. From a supply chain management perspective, this "buy time with inventory" strategy pushes up short-term shipping demand, especially on trans-Pacific and trans-Atlantic routes, while increasing pressure on warehouses and ports.

AI Hardware: Structural Demand Beyond Cyclical Fluctuations

Unlike the short-term stockpiling of pharmaceuticals, imports of capital goods such as computer accessories and semiconductors saw only a slight month-over-month increase but a year-over-year surge of 42%. This reflects the ongoing absorption of AI hardware by U.S. data center construction, not a temporary adjustment. Grace Zwemmer stated that this growth is driven by demand for artificial intelligence hardware. The expansion of data centers, cloud computing, and AI training clusters is becoming a new pillar of global trade, funneling high-value electronics from East Asia (especially Taiwan and South Korea) and Southeast Asian packaging hubs to U.S. West Coast ports. This trend began to emerge between 2023 and 2024 and has further strengthened in 2025. In the long term, AI hardware trade will continue to drive logistics volumes for semiconductor manufacturing equipment, memory chips, servers, and other product categories, placing higher demands on port cold storage and fast-ship services.

Crude Oil Exports: A Brief Respite from Geopolitical Easing

On the export side, crude oil and petroleum products saw growth in May. The backdrop was Israel's strike on Iran triggering a crisis over the closure of the Strait of Hormuz, causing oil prices to soar, followed by a U.S.-Iran memorandum of understanding that partially reopened the strait. May data indicates that oil exports are returning to pre-war levels. However, this recovery is very fragile. If a long-term agreement is not reached, energy transport routes could be blocked again. Global oil tanker routes have already shifted to bypass the Cape of Good Hope, increasing freight costs and voyage distances, while U.S. Gulf Coast crude export hubs (such as Houston) face throughput pressure. From a supply chain resilience perspective, diversifying energy trade routes is becoming a strategic issue for the U.S. and its allies, but in the short term, it remains highly dependent on the stability of the Strait of Hormuz.### The Bigger Picture: Supply Chains Are Being Restructured Politically

The widening of the U.S. trade deficit in May is not an isolated event. It reveals that global supply chains have entered a "policy response mode": companies are adjusting their procurement not only based on demand and costs but also incorporating tariff timelines, geopolitical risks, and policy uncertainty into core inventory decisions. This "frontloading" behavior distorts monthly trade data and accelerates regionalized inventory layouts—for example, establishing buffer warehouses in Mexico or Southeast Asia to circumvent direct U.S.-China trade risks. Meanwhile, the structural demand generated by the AI investment boom keeps some trade flows robust, contrasting with short-term policy-driven fluctuations.

In the coming months, as pharmaceutical tariffs take effect and trade policy further fluctuates during the U.S. election year, the deficit data may continue to swing violently. But what truly warrants attention is whether companies will convert frontloading into permanent nearshoring and whether AI hardware demand can sustain trans-Pacific shipping routes. These questions will determine the fundamentals of the global maritime market in the second half of 2025.

(This article is based on data released by the U.S. Department of Commerce in July 2025 and analyses from Oxford Economics, Nationwide Insurance, and other institutions.)