S&P 500 Futures Flat Ahead of Warsh's Jackson Hole Address

S&P 500 futures shed 0.1% as investors awaited Federal Reserve Chairman Kevin Warsh's upcoming address at the Jackson Hole symposium. Nasdaq 100 futures lost 0.2%, while Dow Jones Industrial Average futures slipped 28 points. Gap shares rose 15% despite a mixed quarterly report, and Marvell Technology declined about 6% after disappointing guidance. This speech is significant as it may provide insight into future interest rate directions, which could impact market sentiments and investment strategies for ordinary investors.