Japan Morning Briefing: What to Watch on May 1, 2026

Tokyo investors face a cautious start to May as geopolitical tensions between the US and Iran overshadow positive overnight momentum from Wall Street, with oil volatility and defense sector implications taking center stage.

Wall Street Recap: US markets closed higher Thursday, with the Dow Jones leading gains at +1.63% to $496.65, while the S&P 500 rose 0.99% to $718.66 and Nasdaq 100 gained 0.93% to $667.74. However, the rally came amid escalating US-Iran tensions, with oil prices retreating after hitting four-year highs on war escalation concerns.

Currency Watch: USD/JPY data remains unavailable this morning, but currency movements will be critical for Japanese exporters as geopolitical risk typically strengthens the yen. Toyota, Sony, and other export-heavy names could face headwinds if the yen appreciates on safe-haven flows.

Key Themes Today: Iran’s threats of “painful response” to potential US attacks dominate headlines, creating uncertainty around energy prices and global supply chains. Trump’s continued criticism of Germany’s Merz over Iran policy adds to diplomatic complexity. Meanwhile, Rivian’s renegotiated $4.5 billion DOE loan signals ongoing EV sector adjustments.

Sectors to Watch: Defense contractors like Mitsubishi Heavy Industries may see interest amid escalating tensions. Energy stocks could be volatile following oil’s retreat from four-year highs. Conversely, export-dependent sectors including automotive and electronics may face pressure if yen strength materializes. NISA investors should monitor how geopolitical risk affects long-term growth sectors.

With Golden Week approaching and Iran tensions creating market uncertainty, today’s session will test investor appetite for risk assets against safe-haven positioning.

This briefing is for informational purposes only and does not constitute investment advice. Please conduct your own research before making investment decisions.