Some of Hotel Groups from Wikipedia.

Marriott International, Inc. is an American diversified hospitality company that manages and franchises a broad portfolio of hotels and related lodging facilities. Founded by J. Willard Marriott, the company is now led by his son, Executive Chairman Bill Marriott and President and Chief Executive Officer Arne Sorenson. Marriott International is the largest hotel company with more than 4,087 properties in over 80 countries and territories around the world, over 697,000 rooms (as of July 2014), and additional 195,000 rooms in the development pipeline. The group includes Marriot Hotels, Ritz Carlton, Bulgari, JW Marriot, Renaissance Hotels, Autograph Collection Hotels & Resorts, AC Hotels, EDITION Hotels, MOXY Hotels, Gaylord Hotels, Marriott Vacation Club (MVC), Courtyard, Fairfield Inn , SpringHill Suites , Protea Hotels, Residence Inn , TownePlace Suites and Marriott Executive Apartments.

In June 2014, Marriott International opened their 4,000th hotel, the Marriott Marquis in Washington, D.C.

Global Hotel Alliance (“GHA”) founded in 2004, and based on the airline alliance model, claims to be the world’s largest alliance of independent hotel brands. GHA uses a shared technology platform for its member brands, and operates a multi-brand loyalty programme, DISCOVERY, which it claims has over 5 million members. GHA’s member brands are currently: Alila, Anantara, Art Series, AVANI, Corinthia, Doyle Collection, First, GLO, Individual Collection, Kempinski, Leela, Lungarno Collection, Marco Polo, Meritage Collection, Mokara, Omni, Pan Pacific, PARKROYAL, Per AQUUM, QT, Rydges, Rixos, Shaza, Tangram, Thon, Tivoli and Ultratravel collection encompassing 550 upscale and luxury hotels with over 110,000 rooms across 76 different countries.

InterContinental Hotels Group PLC informally InterContinental Hotels or IHG is a British multinational hotelscompany headquartered in Denham, UK. IHG has over 670,000 rooms and 4,600 hotels across over 100 countries. Its brands include Candlewood Suites, Crowne Plaza, Even, Holiday Inn, Holiday Inn Express, Hotel Indigo, Hualuxe, InterContinental and Staybridge Suites. Of the 4,602 hotels, 3,934 operate under franchise agreements, 658 are managed by the company but separately owned, and 10 are directly owned.

Carlson (often referred to by its previous name Carlson Companies) is an American privately held international corporation in the hotel and travel industries. Headquartered in Minnetonka, Minnesota, a Minneapolis suburb, Carlson brands and services, including franchised operations, employ more than 175,000 people in more than 160 countries and territories. The company's 2012 sales, including those from franchised operations, totaled $37.6 billion. It is one of the largest family-held corporations in the United States Carlson's subsidiaries include: Carlson Rezidor Hotel Group, Radisson, Radisson Blu, Radisson Red, Country Inns & Suites, Park Inn by Radisson, Park Plaza Hotels & Resorts, Quorvus Collection, Carlson Wagonlit Travel and Carlson Wagonlit Travel.

Accor S.A. is a French hotel group, part of the CAC 40 index, which operates in 92 countries.

Headquartered in Paris, France, the group owns, operates and franchises 3,600 hotels on 5 continents representing several diverse brands, from budget and economy lodgings to luxurious accommodations in exotic locales. Some of its brands include economy brands such as ibis, ibis budget and hotelF1. Midscale brands include Mercure, Novotel and Adagio. Upscale brands include: Grand Mercure, Pullman, MGallery and Mei Jue. Luxury brands include Sofitel.

Starwood Hotels and Resorts Worldwide, Inc. is an American hotel and leisure company headquartered in Stamford, Connecticut. One of the world's largest hotel companies, it owns, operates, franchises and manages hotels, resorts, spas, residences, and vacation ownership properties under its nine owned brands. As of 1 December 2012, Starwood Hotels and Resorts Worldwide, Inc. owned, managed, or franchised 1,162 properties employing over 171,000 people, of whom approximately 26% were employed in the United States.The chain consists of Sheraton, Westin, Four Points, The Luxury Collections, W Hotels, St Regis, Le Merdien and Aloft.