Dow futures fall more than 300 points as midterm elections, Apple and Palantir earnings drive mixed open

US equity futures were mixed before Tuesday's open as investors awaited midterm election results and digested a heavy earnings slate. Dow futures fell 0.7%, S&P 500 futures slipped 0.2%, and Nasdaq-100 futures rose 0.3%. Apple fell 4% premarket despite beating fiscal fourth-quarter estimates and guiding above consensus. Palantir dropped more than 6% after a beat but slower new contract growth. AMD rose 3% ahead of its after-close report.