US-Japan pact seen reshaping investment flows

A new US-Japan investment pact is emerging as a key pillar in the economic relationship between the two countries, with Jefferies highlighting it as both large in scale and under-recognised by institutional investors. The agreement covers about $550 billion of planned investment and includes a broad reduction in reciprocal tariffs, from around 25% to 15%, across a range of traded goods.

According to a recent Jefferies note, the pact is designed to expand US export access into Japanese markets in manufacturing, aerospace, agriculture, energy, autos and industrial goods. The structure of the deal gives the US a significant financial edge at the project level, with Jefferies estimating that the US is positioned to retain roughly 90% of project-level profits once costs are recovered.

The investment window is also time-bound. All funding under the pact must be allocated by January 19, 2029, which creates a defined horizon for capital deployment. The first project under the framework is expected by March, signalling that the shift from agreement to execution is already underway.

Jefferies notes that the agreement prioritises three interlocking areas: energy, AI infrastructure, and critical minerals processing. In practice, this points to upstream investment in fuel and power, midstream handling of key inputs such as processed minerals, and downstream deployment of AI-ready data and compute capacity.

The emphasis on AI infrastructure aligns with rising demand for power-intensive data centres and networks, while critical minerals processing is seen as a bottleneck for technologies such as batteries and advanced electronics. By channelling investment into these segments, the pact aims to reinforce supply chain resilience and support industrial competitiveness in both countries.

Jefferies identifies six sectors that could be positioned to benefit most from these priorities: Power & Utilities, AI Infrastructure, Mining & Metals, Defense & Aerospace, Manufacturing & Logistics, and Pharma & Biotech. The firm frames these areas as spanning both the enabling infrastructure and the end markets linked to the pact.

The new pact builds on an already deep financial relationship. As of the end of 2024, Japan held $819 billion in US foreign direct investment stock, the largest of any country, with a skew toward manufacturing, electronics and financial services. This position reflects decades of cross-border industrial integration.

On the portfolio side, Japan’s holdings of US Treasuries reached $1.2 trillion by November 2025, putting it about $314 billion ahead of the UK. Japan also remains a major holder of US equities, agency securities and corporate bonds, underscoring the breadth of its role in US capital markets beyond trade in goods and services.

Jefferies argues that, despite these large numbers, the strategic importance of the US-Japan economic link remains underappreciated in equity positioning and sector allocation. The firm frames the new pact as an incremental layer on top of an already substantial base of flows and exposures.

The economic agreement is reinforced by long-standing security arrangements. Japan currently hosts roughly 55,000 US troops and participates in multilateral security formats such as the Quad and US-Japan-South Korea trilateral cooperation. These structures underpin a shared strategic outlook in the Indo-Pacific.

Jefferies notes that defense exposure is likely to rise under the new framework as Japan procures additional US systems, including Tomahawk deployments. Japan plans to lift its defense budget to about $58 billion in fiscal year 2026, representing a 3.8% increase, which may translate into further demand for US aerospace and defense equipment.

Taken together with the investment pact, these moves point to a reinforced, multi-dimensional alliance. For investors, the combination of trade liberalisation, targeted sector priorities and higher defense outlays adds a series of potential revenue streams for companies tied into US-Japan economic and security cooperation.