Nvidia's revenue significantly relies on four anonymous 'whales,' as nearly half its $30 billion turnover is attributed to their purchases. The identities of these customers are undisclosed but are speculated to include tech giants such as Amazon, Meta, Microsoft, Alphabet, OpenAI, or Tesla. Their spending is mainly on Nvidia's data center chips, like the AI chip H200 used for training AI models. Despite Nvidia's CEO Jensen Huang claiming diversification, the concentration on a few customers raises concerns about the sustainability of growth.