When evaluating the most expensive United States equities, financial analysts typically look at two distinct definitions: stocks with the highest absolute share price per single unit of equity and stocks with the highest overall market capitalization or valuation multiples. Companies like Berkshire Hathaway trading under class A shares frequently command the highest absolute nominal price per individual share, often costing hundreds of thousands of dollars because the firm has historically chosen not to split its stock. Conversely, when measuring by total market capitalization—which reflects the overall corporate value determined by the public market—giant technology conglomerates such as Microsoft, Apple, NVIDIA, Alphabet, and Amazon rank as the most expensive and valuable corporations in the United States. These mega-cap enterprises command trillions of dollars in market valuation driven by dominant market positions, massive cash generation, and extensive global influence across artificial intelligence, cloud computing, and consumer technology sectors.