ZenithOptimedia is a global advertising and media agency headquartered in New York City, United States. It is a part of Publicis Groupe, one of the world's largest communications and marketing companies. The history of ZenithOptimedia dates back to the formation of Zenith Media in London in 1988.

It quickly established itself as a leading media agency, known for its innovative approach to media planning and buying. In 2000, Publicis Groupe acquired the agency and merged it with Optimedia, another media agency owned by the group, to form ZenithOptimedia. The merger allowed the company to expand its global reach and capabilities, becoming one of the largest media agencies in the world.

ZenithOptimedia offers a wide range of products and services to its clients. These include media planning and buying, digital advertising, strategic communications planning, data analytics, and research and insights. The agency works with clients across various industries, including technology, automotive, consumer goods, finance, and more.

On a global scale, ZenithOptimedia operates in over 80 countries with more than 7,000 employees. The agency has established a strong presence in key markets around the world and has built a reputation for delivering innovative and effective marketing solutions. It has several noteworthy subsidiaries and joint ventures, such as Newcast (specializing in branded content), Performics (a performance marketing agency), and Moxie (a digital marketing agency).

In terms of market position, ZenithOptimedia is a leading player in the global advertising and media industry. It consistently ranks among the top media agencies globally based on billings and revenue. The agency has a strong client base and has won numerous awards for its work, including Cannes Lions, Effie Awards, and MediaPost Awards.

In recent years, ZenithOptimedia has adapted to the evolving advertising landscape by enhancing its digital capabilities and investing in data-driven solutions. It has expanded its offerings to include programmatic advertising, social media marketing, and mobile advertising, to meet the changing needs of its clients. As of the latest available information, ZenithOptimedia continues to operate as a key player in the advertising and media industry, providing innovative and effective marketing solutions to its clients worldwide