As of December 2025 National Grid has a market cap of โฌ63.30 Billion. This makes National Grid the world's 297th 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 National Grid was reported to be: