Midterms: Markets Price a Democratic House, the Senate Is Still Open

US voters will elect all 435 House seats and 35 Senate seats on Tuesday. President Trump's Republican Party currently controls both chambers.

The House stands at 218 Republicans and 214 Democrats. In the Senate, Republicans hold 53 seats, while Democrats and two independents who vote with them hold 47. Democrats need a net gain of four seats in each chamber; a 50-50 Senate goes to Republicans on Vice President Vance's vote.

Polls point one way. Democrats lead the generic ballot by about 8 points, and Trump's approval rating sits around 37-38%.

Three Scenarios, Three Different Washingtons

Some things do not change in any scenario. The Supreme Court ruled in February that the IEEPA law does not authorize tariffs, but tariffs under Sections 232 and 301 remain in force. Congress could only reverse them with a veto-proof majority, which no forecast shows.

According to Reuters, the White House is preparing executive-only steps in case it loses the House. These include new tariffs on critical minerals and wind turbine imports; the White House denied the report.

Defense and healthcare are the winners most often cited under a split Congress. JPMorgan sees that outcome as generally benign. Jefferies highlights hospital operators HCA and Tenet, and defense names RTX and General Dynamics.

A Democratic sweep could bring back health subsidies. The enhanced ACA premium credits expired on Jan. 1; the House passed a three-year extension 230-196 in January, but the Senate did not. Goldman expects selling pressure on pharma, defense, big tech, investment banks and crypto in this scenario.

Crypto is the most exposed sector. The CLARITY Act fell 10 votes short of the 60 it needed in the Senate on Sept. 15 (we covered that vote). A Democratic Senate lowers the odds of the bill passing in its current form, a direct risk for Coinbase.

The market is pricing the election as a probability distribution, not a result. That is why the surprise, not the winner, sets the real move.

Why a Priced-In Result Barely Moves Prices

The options market also expects a quiet night. Saxo estimates that S&P 500 options expiring Nov. 4 price a move of about ±1.3%; the median post-election move since 1990 is 0.7%.

The real calendar starts after the vote. Stopgap funding expires on Dec. 11, and the outgoing Congress will have to handle it. The debt limit is expected to be reached around mid-2027, which makes it the new Congress's fight.

The Senate's weight comes from the Fed. Kevin Warsh was confirmed as Fed chair 54-45 in May. A Democratic Senate could block future nominees to the Fed board.

What History Says, and What Is Different This Year

According to Ryan Detrick's compilation, the S&P 500 rose in the 12 months after all 20 midterms since 1946, by about 15% on average. Morgan Stanley puts that average at 23% under a Republican president with a split Congress.

This year the vote comes on weak footing. The S&P 500 fell 1.8% to close at 7,580 on Oct. 30, and the Nasdaq lost more than 5% in October.

The 10-year yield is near 4.9% and oil is above $100; the chart below shows the index over the past six months.

A 20-observation series cannot say what happens with yields this high. Midterm-year averages reflect the selling that builds before the vote, not the vote itself.

What It Means for Investors

• The market has largely priced a Democratic House; a House flip alone will not move the index, the Senate result and a surprise Republican win will.
• Defense (Lockheed Martin), crypto (Coinbase) and pharma are most sensitive to a Democratic Senate; hospitals and renewables (NextEra) to a Republican win.
• The date to watch is Dec. 11: if stopgap funding is not extended, a shutdown returns for the third time in 2026.
• The risk to this view is a result that takes days; close Senate races that drag out the count would break the priced-in calm.

Seat counts are from the House Press Gallery; odds from Polymarket, Kalshi and Silver Bulletin. Policy scenarios draw on Reuters, JPMorgan, Goldman Sachs, Jefferies, Morgan Stanley and Wells Fargo. Historical returns come from Carson Group and Morgan Stanley compilations, and options pricing from Saxo.