Ten major stocks tumbled Feb. 2–6, 2026, on earnings warnings and downgrades, while a few surged on strong results.

Ten large-cap stocks declined sharply from February 2 to 6, 2026, led by Stellantis (STLA) down 26.24% after warning of a full-year net loss, Gartner (IT) off 25.41% on weak earnings and lowered guidance, and PayPal (PYPL) dropping 22.92% amid disappointing results and executive changes. Others including Reddit, IREN, Thomson Reuters, Atlassian, Novo Nordisk, Boston Scientific, and IQVIA also fell due to earnings misses, revised outlooks, or analyst downgrades. Conversely, Lumentum, XPO, and Regal Rexnord were top gainers, rising 36.02%, 37.75%, and 32.14% respectively, fueled by strong earnings, upgraded forecasts, or positive contract and clinical news.