Yokohama Rubber announces that it has joined PROJECT TREE, an initiative founded by ITOCHU Corporation to promote the sustainability of natural rubber. PROJECT TREE aims to realize transparency in the natural rubber supply chain through a blockchain-based traceability system. Yokohama Rubber is using natural rubber procured through the PROJECT TREE framework and began supplying tires for commercial vehicles operated by FamilyMart Co., Ltd. as project-supported tires on September 25, 2026.