Group 1 - The U.S. biofuel companies' stock prices have recently plummeted due to market concerns that the Trump administration's policies may not fully offset the impact of the "refinery renewable fuel blending obligation exemptions" [1] - The Trump administration is considering a plan that would require large refineries to take on "half or less of the blending obligations originally allocated to exempt small refineries" [1] - A bill proposed by Republican Senator Mike Lee aims to prevent the EPA from mandating large refineries to fill this obligation gap, which could weaken short-term demand for crop-based and waste-based biofuels [1] Group 2 - Bunge Global SA and Archer-Daniels-Midland Co. experienced their largest single-day stock price drop since April, while Valero Energy Corp. and Green Plains Inc. saw stock declines of up to 5% [2] - The trading price of Renewable Identification Numbers (RINs), a key price indicator in the biofuel sector, has fallen to its lowest level since June [2]