CF Industries is trading at $111.96, down 4.15%, as reports point to pressure over a potential lower-cost Belarus potash supply deal. - President Trump’s discussion raised concerns about competition and crop-nutrient pricing; today’s specific driver is not independently confirmed. - CF Industries is scheduled to report third-quarter results after the market closes on November 4; the earnings preview is not a reported result. - The broader materials sector is up and does not explain the decline.