London Stock Exchange Group

Global leader in financial markets infrastructure and data, competing with Bloomberg and FactSet; significant upstream data provider for financial services marketing and compliance

London Stock Exchange Group (LSEG) is one of the world's leading financial markets infrastructure and data businesses, headquartered in London. The company operates across four key divisions: Data & Analytics, Capital Markets, Post Trade, and FTSE Russell. Its 2021 acquisition of Refinitiv for approximately $27 billion transformed LSEG into a major financial data powerhouse, competing directly with Bloomberg and FactSet in the financial data and analytics space. LSEG's connection to the AdTech ecosystem stems primarily through its data and analytics capabilities, particularly via the Refinitiv business and its World-Check risk intelligence platform. The group provides financial institutions, marketers, and enterprises with data solutions that inform targeting, compliance, and audience intelligence. LSEG also operates through partnerships and data licensing arrangements that touch programmatic advertising, financial services marketing, and identity resolution for regulated industries. As a publicly traded entity on the London Stock Exchange itself, LSEG serves a global client base spanning investment banks, asset managers, hedge funds, and financial services firms. Its data assets — including real-time market data, reference data, and risk intelligence — make it a significant upstream data provider in ecosystems where financial services advertising and compliance-driven marketing intersect.