SEK joined to SRAT 2014 which is Sumitomo Rubber Industries, Ltd. (住友 ゴ ム 工業 株式会社, Sumitomo Gomu Kōgyo Kabushiki-gaisha) is a global tire and rubber company based in Japan. It is part of the Sumitomo Group. The company makes a wide range of rubber based products, including automobile tires, golf balls and tennis balls. Sumitomo brands include Dunlop Tires (in certain regions of Asia, Africa, and Latin America), Falken Tire and Ohtsu Tire.

The company traces its origins to 1909, when the Sumitomo Group was made an investment in Dunlop Japan, the newly formed subsidiary of the British company Dunlop Rubber. Over the years Sumitomo and Dunlop developed a close business relationship, and in 1963 the Sumitomo Group acquired control of Dunlop Japan and renamed it Sumitomo Rubber Industries Ltd.

In 1985, when Dunlop Rubber was taken over by BTR plc, the company acquired the automobile tire assets of Dunlop, including the right to use the Dunlop brand on automobile tires. The acquisition did not include US and Australian businesses, which were separately owned, but in 1986 Sumitomo also acquired the Dunlop Tire Corporation of the US from its management.

In 1997, Sumitomo formed a joint venture with Goodyear Tire and Rubber Company, by which Goodyear and Sumitomo agreed to manufacture tires for each other's markets, including Dunlop branded tires. As part of the agreement, Goodyear acquired 75% interests in Dunlop Tires, the UK company which Sumitomo had formed, and in Dunlop Tire Corporation. Goodyear and Sumitomo also made investments in each other.

On February 14, 2014, Goodyear announced its intention to dissolve its partnership with Sumitomo due to the alleged "anticompetitive conduct". On June 4, 2015, Goodyear announced the end of its joint venture with SRI, effective end of year 2015. The Dunlop brand will be shared between the 2 companies