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S4 Capital PLC is a digital advertising and marketing services company that operates internationally across the Americas, Europe, the Middle East, Africa, and the Asia Pacific. Founded by Sir Martin Sorrell in 2018, the company offers a comprehensive range of services through three main segments: Content, Data & Digital Media, and Technology Services. S4 Capital is publicly traded under the ticker symbol SFOR on the London Stock Exchange, focusing on providing integrated and innovative marketing solutions to global clients.

Founded in 2002 and commonly known as SpaceX, the Space Exploration Technologies Corporation designs, manufactures, and operates a family of reusable rockets to launch various payloads into Earth orbit for government and commercial customers. Starting in 2019, the company began launching a constellation of its own communication satellites to provide mobile broadband and wireless services under the Starlink brand. In early 2026, the company acquired xAI from its founder, Elon Musk, which operates a large language artificial intelligence model named Grok, a gigawatt-scale data center called Colossus, and the social media network X.