Kalyon Holding is a major Turkish conglomerate headquartered in Istanbul, Türkiye, with diversified activities across construction, infrastructure, energy, real estate, industry, and venture capital. Established by the Kalyoncu family and evolving from its origins in construction, the group has grown into a large organisation involved in building major national and international projects — including highways, rail systems, pipelines, and the Istanbul Airport — while also expanding into renewable energy, solar panel manufacturing and power generation. It operates renewable projects such as the massive Karapınar solar power plant and owns an integrated solar panel production facility, reflecting its commitment to clean energy and technological development. The holding’s energy arm, Kalyon Enerji, focuses on solar and wind power projects and is jointly owned with international partners, with ambitions for global expansion. With a workforce in the tens of thousands, Kalyon Holding combines infrastructure delivery with investment in future-oriented sectors and is active in social initiatives through affiliated foundations and education projects.