As of December 2025 National Grid has a market cap of โฌ65.19 Billion. This makes National Grid the world's 285th 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 16th, 2025 the market cap of National Grid was reported to be: