Meliá Hotels International is a Spanish hotel chain headquartered in Palma de Mallorca, operating around 350 hotels across brands including Gran Meliá, Meliá, Innside and Sol. Founded in 1956 by Gabriel Escarrer Juliá, it is one of the largest resort hotel operators in the world, consistently ranked among Europe’s most sustainable hospitality companies.

Accor is a French multinational hospitality group headquartered in Issy-les-Moulineaux near Paris, operating around 5,600 hotels across more than 45 brands from economy to luxury. Founded in 1967, it is one of the largest hotel operators outside the United States. Its sustainability agenda covers decarbonisation, water and food-waste reduction, and social initiatives.

InterContinental Hotels Group (IHG Hotels & Resorts) is a British multinational hospitality company headquartered in Windsor, England, with more than 6,000 hotels across brands such as InterContinental, Holiday Inn and Crowne Plaza. The group in its current form was created in 2003. Its Journey to Tomorrow responsible-business plan addresses carbon reduction, water stewardship, waste and community programmes.

Hilton Worldwide Holdings is a global hospitality company headquartered in McLean, Virginia, operating around two dozen brands and thousands of hotels and resorts worldwide. Founded in 1919 by Conrad Hilton, it is one of the largest lodging companies in the world. Its Travel with Purpose strategy focuses on cutting carbon and water use, reducing waste, and creating social value across its supply chain and communities.