US stocks surged to a three-month high on Wednesday, November 4, after Democrats won control of both chambers of Congress in a major midterm setback for President Donald Trump. The market reaction came as investors assessed how a Democratic-controlled Congress could affect the administration’s economic policies, government spending and geopolitical decisions.

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The Dow Jones Industrial Average jumped more than 1,500 points, gaining around 3%. The S&P 500 rose 1.58%, while the Nasdaq Composite advanced 1.44%. The S&P 500 recorded its strongest daily gain in three months.

Investors are betting that a Congress controlled by Democrats could act as a check on some of Trump’s unpredictable policy decisions, including tariffs and deficit-funded spending. However, the political shift could also bring tighter oversight of artificial intelligence, technology companies and digital assets.

The reaction across technology stocks was mixed. Microsoft, Amazon, Alphabet and Meta advanced, while data-centre operators faced pressure amid concerns about possible restrictions on infrastructure expansion and energy consumption. The semiconductor index fell 3.1%, reaching a six-month low.

Oil prices also declined sharply. Brent crude fell more than 8% to around $95 a barrel, as investors considered whether the election result could increase pressure on Trump to seek an end to the Iran conflict. Lower energy prices could ease inflationary pressures, although any escalation in the Middle East could reverse the trend.

US Treasury bonds rallied as the 10-year yield fell to around 4.89%. Investors are also watching whether a Democratic-controlled Congress could limit additional deficit spending and ease concerns about the country's roughly $40 trillion debt burden.

The market gains reflect investor expectations rather than certainty about future policy decisions.