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Clear Channel Outdoor Holdings, Inc. operates as an out-of-home advertising company in the United States, Europe, and internationally. It operates through America, Airports, Europe-North, and Other segments. The company provides advertising services through billboards, including bulletins and posters, as well as spectaculars, which are customized display structures with videos, multi-dimensional lettering and figures, mechanical devices, moving parts, and other embellishments; street furniture displays, such as advertising surfaces on bus shelters, information kiosks, news racks, and other public structures; transit displays for rail stations and on various types of vehicles; retail displays; and airport advertising displays. It offers solutions, such as RADARView, an audience and campaign planning tool, which analyzes historical mobile location data; RADARConnect, a campaign amplification solution that delivers ads across mobile and other devices to re-target audience groups exposed to an out-of-home advertisement; RADARProof, a campaign measurement and attribution solutions which analyzes anonymized and/or aggregated data; and RADARSync, a data integration platform that uses customer data across the tools for customized application of solutions to customers' specific audience targets and goals. In addition, the company sells street furniture equipment; provides cleaning and maintenance services; and operates public bike programs, a public bicycle rental program that offers bicycles for rent to the public. The company was formerly known as Eller Media Company and changed its name to Clear Channel Outdoor Holdings, Inc. in August 2005. Clear Channel Outdoor Holdings, Inc. was incorporated in 1995 and is headquartered in San Antonio, Texas.

The Interpublic Group of Companies, Inc. provides advertising and marketing services worldwide. It operates in three segments: Media, Data & Engagement Solutions, Integrated Advertising & Creativity Led Solutions, and Specialized Communications & Experiential Solutions. The Media, Data & Engagement Solutions segment provides media and communications services, digital services and products, advertising and marketing technology, e-commerce services, data management and analytics, strategic consulting, and digital brand experience under the IPG Mediabrands, UM, Initiative, Kinesso, Acxiom, Huge, MRM, and R/GA brand names. The Integrated Advertising & Creativity Led Solutions segment offers advertising, corporate, and brand identity services; and strategic consulting under FCB, IPG Health, McCann Worldgroup, and MullenLowe Group brands. Specialized Communications & Experiential Solutions segment provides public relations and other specialized communications services, live events, sports and entertainment marketing, and strategic consulting under IPG DXTRA Health, The Weber Shandwick Collective, Golin, Jack Morton, Momentum, and Octagon brand names. The company was formerly known as McCann-Erickson Incorporated and changed its name to The Interpublic Group of Companies, Inc. in January 1961. The Interpublic Group of Companies, Inc. was founded in 1902 and is headquartered in New York, New York.

Lamar Advertising Company operates as an outdoor advertising company in the United States and Canada. The company owns and operates billboards, logo signs, and transit advertising displays, as well as rents space for advertising on billboards, buses, shelters, benches, logo plates, and in airport terminals. Lamar Advertising Company was founded in 1902 and is headquartered in Baton Rouge, Louisiana.

Omnicom Group Inc., together with its subsidiaries, offers advertising, marketing, and corporate communications services. It provides a range of services in the areas of advertising and media, precision marketing, commerce and branding, experiential, execution and support, public relations, and healthcare. The company's services include advertising, branding, content marketing, corporate social responsibility consulting, crisis communications, custom publishing, data analytics, database management, digital/direct marketing and post-production, digital transformation consulting, entertainment marketing, experiential marketing, field marketing, sales support, financial/corporate business-to-business advertising, graphic arts/digital imaging, healthcare marketing and communications, and instore design services. Its services also comprise interactive marketing, investor relations, marketing research, media planning and buying, retail media planning and buying, merchandising and point of sale, mobile marketing, multi-cultural marketing, non-profit marketing, organizational communications, package design, product placement, promotional marketing, public affairs, public relations, retail marketing, retail media and e-commerce, search engine marketing, shopper marketing, social media marketing, and sports and event marketing services. It operates in the North and Latin America, Europe, the Middle East and Africa (EMEA), and the Asia Pacific. The company was incorporated in 1944 and is based in New York, New York.