US Midterm Election Results and Their Market Implications

Democratic control of both chambers of Congress should constrain the Trump administration while leaving AI-driven growth and Japanese equities supported over the medium term.

• Democrats appear to have won 54 Senate seats and 253 House seats, giving them majorities in both chambers from January 3, 2027, while President Trump retains veto power.
• Additional tariffs, possible military action involving Iran or Latin America, and disputes over the budget and debt ceiling could increase market risks, including government shutdown and default concerns.
• The Nikkei 225 briefly fell by around 3,000 points to 60,030 and entered the 50,000 range on November 6 as AI semiconductor stocks sold off, although Japanese companies continued to deliver strong earnings and upward forecast revisions.
• The S&P 500 fell 4.4% on November 5 after rising 1.58% on November 4, while the MSCI All Country World Index had projected 2027 earnings-per-share growth of about 17% and a forward price-to-earnings ratio near 15 times.
• The 10-year U.S. Treasury yield declined from 4.96% on November 3 to 4.83% on November 5, while the yen strengthened as lower yields and reduced expectations for expansive fiscal spending weighed on the dollar.

Takeaway: Regulatory uncertainty may keep AI-related equities volatile, while resilient earnings, AI investment and Japanese corporate reforms support a constructive medium- to long-term equity view; bond yields and the dollar remain sensitive to inflation, Federal Reserve policy, oil prices and political gridlock.