Dow Jones Today: S&P 500 Gives Up Early Gains as Stocks Struggle to Sustain Rally; Palantir Jumps After Earnings

Major indexes moved lower Tuesday morning, retreating from early-session gains, as an early-week rally stalled. The Dow Jones Industrial Average (DJI) and S&P 500 (SPX) were each down 0.5% recently, while the tech-heavy Nasdaq Composite (IXIC) droppe... [2406 chars]