Cosan (CSAN) Fell by Over 10% This Week. Here is Why

Group 1 - Cosan S.A. (NYSE:CSAN) experienced a significant share price decline of 10.45% from December 3 to December 10, 2025, making it one of the worst-performing energy stocks during that week [1] - The company operates as a Brazilian conglomerate involved in fuel distribution through various segments, including Raízen, Compass, Moove, Rumo, and Radar [2] - The decline in Cosan's stock price was influenced by political developments in Brazil, particularly the endorsement of Senator Flavio Bolsonaro by former President Jair Bolsonaro for the upcoming presidential election, which created a politically risky environment [3]