As of December 2025 ONE Gas has a market cap of NZ$7.95 Billion. This makes ONE Gas the world's 3198th 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 10th, 2025 the market cap of ONE Gas was reported to be: