Supreme Court Rules in Favor of Monsanto in Roundup Lawsuit

Published: June 25, 2026, 5:37 pm

The U.S. Supreme Court has delivered a significant win to Monsanto, choosing not to intervene in a closely watched legal battle involving claims that the widely used weedkiller Roundup poses cancer risks. By declining to hear the appeal, the high court effectively maintained the current legal standing regarding the product’s warning labels and liability claims.

The litigation centered on allegations that Monsanto, now a subsidiary of Bayer, failed to adequately warn consumers about the potential health hazards associated with glyphosate, the primary active ingredient in Roundup. The refusal of the Supreme Court to take up the case keeps the existing appellate court rulings in place, providing a major procedural victory for the company as it navigates ongoing litigation across the country related to the controversial herbicide.