Which of the following is NOT a key vendor?

The correct answer is Amazon because it is primarily an e-commerce and cloud computing company, not specifically focused on financial data delivery and analytics, which is the common focus of key vendors in the financial services industry. Thomson Reuters, Bloomberg, and Factset are all renowned for their contributions to financial information services. They provide a range of products and services that include market data, analytics, and financial news, making them critical vendors in the finance domain. In contrast, Amazon’s core business revolves around online retail and cloud solutions, and while it may offer some financial services through platforms like Amazon Web Services, it does not position itself as a key vendor in financial data and analytics like the others listed.