Sankyo Seiko Co., Ltd. engages primarily in fashion licensing, textile manufacturing, and real estate leasing businesses in Japan and internationally. Founded on May 15, 1920, and headquartered in Osaka, Japan, with additional offices in Tokyo, Taipei, and Paris, the company offers international brand licensing for DAKS and LEONARD; domestic and international trade, import, and export of branded apparel products; OEM production of textile and apparel items including nightwear, bedding, interior accessories, ladies', men's, and junior clothing; supply of textiles and fabrics; and property rentals for offices, shops, halls, and event spaces such as SUNRISE Buildings in Tokyo and Osaka. It operates through segments focused on fashion and brand management, textiles, and real estate, serving consumer markets across Asia, Europe, and beyond with financing from major banks including MUFG Bank, Sumitomo Mitsui Banking Corporation, and Resona Bank. Recent developments include the absorption of subsidiary Sankyo Seiko Apparel Fashion Co., Ltd. in 2025; authorization of a share buyback program on November 6, 2025, for up to 2 million shares representing 5.22% of issued capital at ¥1.3 billion through November 2026 to support flexible capital policies; establishment of the second Mid to Long-term Management Plan “Challenge Next 100” in 2024; and opening of a DAKS flagship shop in “Vulcanize London, Aoyama” in 2024 alongside ongoing expansion of LEONARD, acquired in 1991 and certified as a French intangible cultural asset company in 2007 with full acquisition in 2022.