Cosan S.A. (CSAN) Sank By Over 20% This Week. Here is Why.

Group 1 - Cosan S.A. (NYSE:CSAN) experienced a significant share price decline of 20.92% from September 18 to September 25, 2025, making it one of the worst-performing energy stocks during that week [1] - The company announced plans to raise up to 10 billion Brazilian reais (approximately $1.9 billion) through a public offering aimed at reducing its increasing debt [3] - Analysts from Citi indicated that the public offering could lead to a 40-50% dilution for current shareholders, but it is expected to be beneficial as it would allow Cosan S.A. to enter a new phase focused on deleveraging [4] Group 2 - Following the recent downturn, Cosan S.A.'s share price has decreased by 51% over the past year [4]