1. Citi's core assessment: The midterm elections will not have a substantial impact on the S&P 500's fundamentals. The market will primarily reflect structural differentiation across sectors. AI will remain the main market theme in 2027, with election-related disruptions being a secondary factor. The market has already priced in the mainstream election results. Historical review shows that the Fed's monetary policy has a far greater impact on US stock market performance than changes in congressional parties.
2. Market impact of different election scenarios: If the Democrats only win back the House of Representatives, Congress will be locked in a policy deadlock, and the overall market will be neutral. If the Democrats achieve a sweep of both houses, the market will pre-price the risks of a 2028 corporate tax increase and tighter AI regulations. However, there are also hedging benefits, as the Democrats can constrain tariffs and foreign war powers, alleviating the two major negative factors currently suppressing the market.
3. At the sector level, the semiconductor sector is more favorable in a Republican-led environment, but due to the president's veto power, the probability of disruptive AI regulatory bills being passed is low. Consumer discretionary is weak due to tariffs and high oil prices. Energy sector gains are driven by geopolitical events related to Iran. Healthcare has potential benefits in a Democratic sweep scenario. (Citigroup report, September 22)
