As of December 2025 American Water has a market cap of NZ$44.15 Billion. This makes American Water the world's 915th most valuable company by market cap according to our data. The market capitalization, commonly called market cap, is the total market value of a publicly traded company's outstanding shares and is commonly used to measure how much a company is worth.
On Dec 19th, 2025 the market cap of American Water was reported to be: