Major U.S. stock indexes ended Monday lower as rising Treasury yields and oil prices nearing $100 per barrel unsettled investors. The Dow Jones Industrial Average fell 0.67% to 51,481.51, the S&P 500 declined 0.77% to 7,683.69 and the Nasdaq dropped 0.92% to 26,820.38. Investors were watching whether the turbulence marked a shift from growth-heavy stocks toward value-oriented sectors. MongoDB shares plunged 18.46% after CEO Chirantan Desai left to join Meta Platforms, with former CEO Dev Ittycheria becoming interim president and CEO. Kodiak Sciences surged 177.96% after reporting positive Phase 3 DAYBREAK results for Zenkuda and tabirafusp-ted, while Navitas Semiconductor fell 3.85% after being selected for a U.S. government program involving 10 kV silicon carbide power semiconductors. Boeing declined 6.91% after disclosing a software glitch affecting 737 MAX jets. Nvidia gained 1.68% after authorizing an additional $150 billion in share buybacks, bringing its remaining authorization to $235 billion through fiscal 2028.